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Apple PowerBook batteries

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Apple PowerBook batteries
A PowerBook Rechargeable Battery, model M3254, from a PowerBook 5300cs
Manufacturer Apple Computer
Type Rechargeable battery packs
Compatible PowerBook 100 to PowerBook G3 Series
Model M3053, M5417, M5653, M5654, M7782, M1499, M1906, M3254 and others (see table)

Apple's PowerBook batteries are the main battery packs for the PowerBook range. Apple sold them as the Macintosh PowerBook Rechargeable Battery, the PowerBook Duo Type I, II and III batteries and, from the PowerBook 500 series on, the PowerBook Intelligent Battery, which has its own processor that reports to the computer's Power Manager.[1][2] Apple used three chemistries in the first PowerBooks: sealed lead-acid in the PowerBook 100, nickel-cadmium in the rest of the 100 series and nickel-metal-hydride in the Duo and 500 series.[3] Later models also used lithium-ion packs: the colour 190 and the 5300, according to Apple's developer notes, and the PowerBook 3400c, PowerBook 2400c and PowerBook G3 Series.[4][5][6][7][8] The packs from different families are not interchangeable and do not fit each other's battery bays.[9]

Every one of these packs is now decades old. Old NiCd and NiMH packs leak, and a leaking pack can damage the battery contacts and the board next to them: see Battery Explosion, Capacitor or Corrosion Damage. For rebuilding a pack with new cells, see Battery Refurbishment.

Warning: a charged PowerBook pack can deliver enough current through a short across its contacts to cause burns or start a fire. Apple supplied an insulating case (part 076-0590) for the 100-series NiCd pack and told owners to keep the pack in it whenever it is out of the computer or charger.[10]

Batteries by model

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PowerBook main batteries (Apple's battery table, April 1996)
Computer Chemistry Capacity Fully charged Model Service part
PowerBook 100 Sealed lead-acid 2.3 Ah 6.0 V M3053 661-0782
PowerBook 140, 145, 170 NiCd 2.5 Ah 6.75 V M5417 661-0013
PowerBook 145B, 150 NiCd 2.8 Ah 6.75 V M5653 661-0013
PowerBook 160, 165, 180 NiCd 2.8 Ah 6.75 V M5654 (see below) 661-0013
PowerBook 165c, 180c NiCd 2.9 Ah 6.75 V M5654 661-0013
PowerBook Duo 210, 230 NiMH, Type I 0.95 Ah 13.5 V M7782 661-1656
PowerBook Duo 250, 270c, 280 NiMH, Type II 1.4 Ah 13.5 V M1499 661-1735
PowerBook Duo 280c, 2300c NiMH, Type III 1.6 Ah 13.5 V M1499 661-0053
PowerBook 520, 540 and colour models NiMH, Intelligent Battery 1.8 Ah 10.8 V M1906 (see below) 661-0055
PowerBook 190, 5300 NiMH 1.9 Ah 16.1 V M3254 661-1028

The table follows Apple's battery information table of April 1996.[11] The 140 to 180 also accept the 2.9 Ah M5654.[11] Apple's identification list of May 1996 disagrees in two places: it says the M5653 shipped with the 160 and 180, and it gives the 500-series battery as M1908.[2] Type II and Type III Duo batteries share model number M1499 and are told apart by the "Type 2" or "Type 3" printed on them.[11]

Apple gives these working ranges, from flat to fully charged: 5.8 to 7.5 V for the 100 series, 10.9 to 16 V for the Duo, and 8.5 to 11.6 V for the 500 series.[12]

PowerBook 100 series

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PowerBook 100 lead-acid battery

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The PowerBook 100's sealed lead-acid battery fits only the PowerBook 100, and no other 100-series model can use it.[13] Apple's rule for lead-acid was to recharge it whenever it ran down and never to discharge it fully. A fully discharged lead-acid battery can sulphate: the lead electrodes turn to lead sulphate and the battery no longer holds a charge.[14] Apple kept the battery available as service part 661-0782 after it stopped selling it.[13] MacDat notes that the original cells are no longer made, so the pack cannot be rebuilt with like-for-like cells; a 68kMLA member designed a replacement using a custom battery management board and lithium-polymer pouch cells.[15] See PowerBook 100 Battery Replacement for removal, the storage switch and the backup batteries.

Macintosh PowerBook Rechargeable Battery (NiCd)

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The other 100-series models use a nickel-cadmium pack sold as the Macintosh PowerBook Rechargeable Battery. Order number M5545LL/A was the original 2.5 Ah pack. M5545LL/B, which Apple called the "universal" battery for the 140, 145, 160, 170 and 180, is 2.8 Ah.[16] With the older pack, a 160 or 180 runs for about 1.5 hours or less.[16] Apple did not recommend the 2.5 Ah M5417 for the 160, 165, 165c, 180 or 180c because of the short run time, and advised the M5654 for the colour models.[2][13]

The matching external charger is the Macintosh PowerBook Battery Recharger, M1027LL/A, which runs from the computer's AC adapter. The PowerBook 100 uses its own charger, M5130LL/A.[2][17] A battery left in a recharger whose adapter is not plugged in drains, and can be damaged if left long enough; in a powered recharger it is held on a trickle charge after the bulk charge and does no harm.[18]

Apple advised discharging a NiCd pack fully and recharging it about every 90 days to avoid the memory effect.[14] Its battery group described the full procedure: every 10 to 20 cycles, run the PowerBook past the third battery warning, leave it asleep for several hours to drain the pack to about 5.7 V, then charge it for two to three hours before use.[19] Apple's external recharger discharges a pack placed in it while the charger is unplugged. Apple warned that third-party chargers that fast-discharge on every cycle wear the pack out.[19]

The NiCd pack uses A-size cells (not AA). MacDat describes it as the simplest PowerBook pack to rebuild, and notes that any NiMH cells that fit and match the voltage will do.[15] See PowerBook 140 Battery Replacement for removal, testing and the backup cell.

Runs from the adapter but not from the battery

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On the PowerBook 100, first check that the storage switch next to the power socket is up; down disables battery power.[20] On the 100, 140, 160, 170 and 180, a blown logic board fuse gives the same symptom. Apple linked it to a damaged black insulating O-ring on the adapter tip shorting against the logic board, and on the 100 also to dismantling the computer with its lithium backup cells still fitted.[20] Apple later issued logic boards with a replaceable fuse: 661-0708 for the 140, 145, 145B and 170, 661-0746 for the 160, 165 and 180, and 661-0765 for the 165c and 180c.[20] A PowerBook 150 with a blown fuse runs from the adapter only while the battery is fitted, and not at all from the adapter with the battery out.[20]

PowerBook Duo batteries

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The Duo uses nickel-metal-hydride packs in three types. Type I came with the Duo 210 and 230, Type II with the 250, 270c and 280, and Type III with the 280c. Type II gives up to 50 per cent longer life than Type I, and Type III up to 15 per cent more than Type II.[21] Type I batteries carry no logo and have a different battery door.[21] Apple noted that the Type I door can stop the battery seating properly and must be locked before the battery goes in.[2]

A Duo 210 or 230 runs Type II and Type III batteries only with the right software. Type II needs PowerBook Duo Enabler 1.0 or System 7.5.[13] Type III needs the Type III Battery Extension supplied with the battery, or System 7.5; PowerBook Duo Enabler 2.0 also supports it but needs System 7.1.1, which the older Duos cannot run.[22][23] Apple's Battery Reconditioning software runs only on the 270c, 280 and 280c.[23]

The first Duo battery recharger, model M7778, charges Type I batteries only. Model M1812 (marketing number M4178LL/B) charges all three types.[23] A red light when a Type III battery goes into an M1812 means the recharger needs updating. Clip the recharger to the side of the power adapter, connect the adapter to the Duo with a Type III battery and its software installed, and switch the Duo on; the update loads into the recharger.[22]

Apple's 1992 note on the Duo pack says NiMH self-discharges at about twice the rate of NiCd, so stored packs must be recharged often. About half the capacity is lost after 14 days at 40 °C, months at that temperature can damage the pack permanently, and charging below 5 °C can also cause permanent damage.[24] MacDat lists the Type III pack as 4/5A cells of 1600 mAh.[15]

PowerBook Intelligent Battery

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The PowerBook Intelligent Battery for the PowerBook 520 and PowerBook 540 is a 9.6 V, 1.9 Ah NiMH pack with a built-in processor. The Power Manager IC talks to it over a serial interface.[1] The PowerBook 550c also takes intelligent batteries in two bays.[25] Apple's battery table gives 1.8 Ah and a fully charged voltage of 10.8 V for the same pack.[11] One battery fits any 500-series PowerBook.[13] Apple's support article describes a small microprocessor in each battery that monitors its status; owners on the 68kMLA forum call the board the EMM, for Energy Monitoring Module.[26][27]

500-series battery revisions
Revision Marking
A BP416 or earlier, no dot
B BP417 or later, no dot
C BSxxx, or BP with a black dot
D BSxxxxxxxxD

BP marks a Panasonic pack and BS a Sanyo pack.[28]

The computer charges the battery in the left bay completely before it starts on the right, and runs from the left battery first. A charged battery is held topped up.[29] A newly fitted battery can take up to 30 minutes, occasionally longer, to be recognised and start charging, because the computer polls the battery at intervals.[30]

The 500 series does not deep-discharge its batteries and Apple did not recommend doing so. Apple's procedure every 90 days is to run on battery until the computer goes to sleep by itself, then connect the adapter and charge fully.[31] A fully charged Intelligent Battery has a six-month shelf life. Discharged in sleep to the point of shutdown, it can stay in that state for six weeks.[32]

Intelligent Battery Recondition software

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The data stored in the battery's processor can become corrupt, and the system then reports the battery wrongly. Apple's Intelligent Battery Recondition software rewrites that data. Run it if the PowerBook does not recognise a battery or a battery will not charge, for example when one battery icon in the Control Strip is greyed out with batteries in both bays.[26]

  1. Install the Intelligent Battery extension in the Extensions folder and restart.
  2. Put the battery to be updated in the right-hand bay. The application updates only that bay.
  3. Connect the AC adapter. The application will not run unless it detects AC power; if it stops at "Please attach AC adapter" with the adapter connected, suspect the adapter.[33]
  4. Run the Intelligent Battery Recondition application and follow the prompts. It takes 7 to 12 minutes. Quitting before it finishes can leave the battery behaving unpredictably.[26]

If the battery still is not recognised, reset the Power Manager: shut down, press Command-Option-Control-Power together and release, then switch on.[13] A battery that ran flat in storage often needs the Recondition software before it will charge again.[13] For a 500 that runs from the adapter but not from a battery with a good voltage, Apple's Service Source says to reseat the battery, run the reconditioner, then fit a new backup battery and charge the computer for 48 hours before replacing the motherboard.[34]

Rebuilding

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MacDat lists the original pack as eight A-size NiMH cells made by Sanyo or Panasonic. It warns that leaking cells are likely to corrode the EMM board or the ribbon cable from it, and that a rebuilt pack needs several software tools before its EMM wakes up again.[15] On the 68kMLA forum, one owner rebuilt two packs with eight-cell AA NiMH packs after the old cells had been out for over a year. Both packs then powered the computer, but neither EMM would talk to it: Lind's BU500 and EMMpathy could not see them, and Apple's Intelligent Battery Update saw them and stopped with an error.[27] Keep the EMM board powered throughout a rebuild if possible: see Battery Refurbishment, step 6.

PowerBook 190 and 5300 batteries

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Apple's developer notes call the PowerBook 5300 battery a Macintosh PowerBook Intelligent Battery, a 16.8 V lithium-ion pack with a built-in processor that talks to the Power Manager.[5] For the PowerBook 190, the note gives a lithium-ion battery for the colour model and NiMH for the greyscale model.[4] The NiMH pack, model M3254, is the one in Apple's 1996 battery table.[11] A lithium-ion pack has a four-LED charge gauge, with a button to light it, on the same side as the release catch, and "Li-Ion" on its label; the NiMH pack has no gauge. Apple's instruction in October 1995 was that any lithium-ion battery should be returned to Apple immediately.[35]

190/5300 NiMH battery voltages (Apple Reliability Laboratory)
State Voltage
Full 16.1 V ± 0.1 V
First battery-low warning 14 V
Second warning about 13.6 V
Third (final) warning about 13.1 V

Apple measured these with a Fluke 77 on ten batteries; the second and third figures are extrapolated.[36] The 190 and 5300 use their own version of Apple's Battery Reconditioning software, separate from the Duo version.[13] The PowerBook 3400c accepts the 5300/190 NiMH pack, which is why it ships with reconditioning software its own lithium-ion pack does not need.[37]

MacDat lists AA cells in the original 190/5300 pack and calls it very hard to rebuild: the case is difficult to open without damaging the outer face, and a leak is likely to make the pack unrecoverable.[15]

PowerBook 1400, 2400c, 3400c and G3 batteries

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The PowerBook 1400 takes one Macintosh PowerBook Rechargeable Battery, an improved NiMH pack of 30 watt-hours.[38][39] Its order number was M4507.[39] The PowerBook 3400c uses a 32 Wh lithium-ion battery (order number M5146) and also supports NiMH.[6] The PowerBook 2400c battery is the M5876LL/A lithium-ion pack.[7] The PowerBook G3 Series uses lithium-ion batteries (M6385G/A) with charge-level lights and a status button; blinking lights mean a fault in the battery. Apple's handling rules include never leaving a battery in the computer for more than a week without the adapter connected and never storing one for more than six months without recharging it.[8]

MacDat's notes on rebuilding these packs:[15]

  • 1400: eight 4/3A Sanyo NiMH cells; the case opens easily and the rebuild is straightforward.
  • 3400c and PowerBook G3: four 26650 Sony lithium-ion cells. The management board locks itself if the cell voltage falls too low or the cells are disconnected, and MacDat knows of no successful rebuild.
  • 2400c: six 18650 lithium-ion cells. One forum member kept the old cells connected during a rebuild; the pack then ran from the new cells but did not recognise their capacity or charge properly.
  • G3 Series (Wallstreet): 17670 lithium-ion cells, which MacDat understands can be rebuilt without the board locking.

MacDat recommends a spot welder for all of them, because soldering to cells, lithium cells especially, risks heat damage and thermal runaway.[15]

Storage and charging

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Apple's 1992 storage guidance for the PowerBook 100, 140 and 170 was: up to a week with a charged battery and no adapter; one to two weeks with the adapter connected, followed by a full discharge and recharge; and no more than six months with a fully charged battery, with the 140 and 170 shut down and the PowerBook 100 battery disconnected.[40] Its shelf-life estimates assume cool storage and a fully charged battery at the start. Apple warned that storing a battery for long periods in a closed circuit can damage it.[32] NiMH packs should be discharged and recharged about every 30 days.[14] Charging is fastest in an external recharger, then in the computer while shut down, then asleep, and slowest while the computer is in use; a full charge can take six to eight hours on some models.[14]

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References

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  1. ↑ 1.0 1.1 Apple Computer, Macintosh PowerBook 520 and 540 Computers Developer Note (1994), Features, PDF p. 17 (one or two PowerBook Intelligent Batteries, 9.6 V, 1.9 Ah NiMH, with built-in processors); Intelligent Battery Support, PDF p. 88 (serial interface to the Power Manager). Hosted as File:PowerBook 520 and 540 Developer Note (1994).pdf.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Apple Computer, Tech Info Library article 16168, PowerBook: Battery, Recharger & AC Adapter Identification (5/96), absurdengineering.org library. Identification of PowerBook power adapters, batteries and chargers, with the models each shipped with and works with.
  3. ↑ Apple Computer, Tech Info Library article 11020, PowerBook: Three Kinds of Batteries (6/94), absurdengineering.org library. Battery chemistry by model: SLA, NiCad, NiMH.
  4. ↑ 4.0 4.1 Apple Computer, Macintosh PowerBook 190 Computer Developer Note (1995), Features, PDF p. 19. Hosted as File:PowerBook 190 Developer Note (1995).pdf.
  5. ↑ 5.0 5.1 Apple Computer, Macintosh PowerBook 5300 Computer Developer Note (1995), Features, PDF p. 19. Hosted as File:PowerBook 5300 Developer Note (1995).pdf.
  6. ↑ 6.0 6.1 Apple Computer, Tech Info Library article 20945, PowerBook 3400 Series: Technical Specifications (2/97), absurdengineering.org library. PowerBook 3400 specifications: 32 Wh lithium-ion battery, also supports NiMH; battery order number M5146.
  7. ↑ 7.0 7.1 Apple Computer, PowerBook 2400c Service Source, Basics, "2400 Series Peripherals" (PDF p. 4): M5876LL/A PowerBook 2400c Lithium Ion Battery. Hosted as File:PowerBook 2400c Service Source.pdf.
  8. ↑ 8.0 8.1 Apple Computer, PowerBook G3 Series Service Source, Basics, Battery Information (PDF pp. 35-36) and Accessories (PDF p. 52). Hosted as File:PowerBook G3 Series Service Source.pdf.
  9. ↑ Apple Computer, Tech Info Library article 12879, Duo and PowerBook: Batteries Not Interchangeable (8/93), absurdengineering.org library. Duo and other PowerBook batteries are not interchangeable and do not fit each other's bays.
  10. ↑ Apple Computer, Tech Info Library article 10160, PowerBook: Rechargeable Battery Safety Notice 7/92, absurdengineering.org library. Shorting the brass contacts can cause burns or fire; insulating carrying case 076-0590.
  11. ↑ 11.0 11.1 11.2 11.3 11.4 Apple Computer, Tech Info Library article 15303, PowerBook Family: Battery Information Table (4/96), absurdengineering.org library. Battery type, capacity, fully charged voltage, service part and model number for each PowerBook to the 5300; Type II and III share M1499; 500 series uses the PowerBook Intelligent Battery; keep contacts clean.
  12. ↑ Apple Computer, Tech Info Library article 14125, PowerBook Batteries: Voltage Range (1/95), absurdengineering.org library. Battery voltage ranges for the 100, 200 (Duo) and 500 series.
  13. ↑ 13.0 13.1 13.2 13.3 13.4 13.5 13.6 13.7 Apple Computer, Tech Info Library article 18241, PowerBook: Power & Battery Frequently Asked Questions (2/97), absurdengineering.org library. Power and battery FAQ: Power Manager resets, reconditioning, interchangeability, PowerBook 100 battery service part 661-0782, 500-series battery recognition, storage, will not run from battery.
  14. ↑ 14.0 14.1 14.2 14.3 Apple Computer, Tech Info Library article 10970, PowerBook: Recharging Batteries (5/95), absurdengineering.org library. Recharging methods by chemistry: lead-acid kept charged; NiCd discharged and recharged every 90 days; NiMH every 30 days; charge times; fastest to slowest charging methods.
  15. ↑ 15.0 15.1 15.2 15.3 15.4 15.5 15.6 MacDat, "PowerBook Battery Rebuild Info" (page updated 2 July 2026, read 4 October 2026). Community reference: cell chemistry, size and count for each PowerBook pack and notes on rebuilding each.
  16. ↑ 16.0 16.1 Apple Computer, Tech Info Library article 10938, PowerBook 160 &180: Use New AC Adapter and Battery (3/95), absurdengineering.org library. Rechargeable Battery M5545LL/A is 2.5 Ah; M5545LL/B "universal" battery for the 140, 145, 160, 170 and 180 is 2.8 Ah; the older pack gives 1.5 hours or less on the 160 and 180.
  17. ↑ Apple Computer, Tech Info Library article 10904, PowerBook 160 and Accessories: Ordering Information 10/92, absurdengineering.org library. PowerBook 160 accessories with order numbers, including Rechargeable Battery M5545LL/B and Battery Recharger M1027LL/A.
  18. ↑ Apple Computer, Tech Info Library article 16426, PowerBook: Leaving Battery in Charger for Extended Time (4/95), absurdengineering.org library. Leaving a battery in an unpowered recharger drains and can damage it; a powered recharger bulk charges, then trickle charges.
  19. ↑ 19.0 19.1 Apple Computer, Tech Info Library article 14051, PowerBook Batteries: Memory Effect (6/94), absurdengineering.org library. Memory effect explained; drain to about 5.7 V every 10 to 20 cycles; the Apple charger can discharge a battery when unplugged; fast-discharge chargers degrade packs.
  20. ↑ 20.0 20.1 20.2 20.3 Apple Computer, Tech Info Library article 10572, PowerBook: What To Do When It Won't Run On the Battery (11/94), absurdengineering.org library. Runs on AC but not battery: PowerBook 100 storage switch; logic board fuse blown by disassembly with lithium cells fitted or by a damaged adapter tip O-ring; revised boards with replaceable fuse (661-0708, 661-0746, 661-0765); PowerBook 150 symptoms.
  21. ↑ 21.0 21.1 Apple Computer, Tech Info Library article 15315, PowerBook Duo: Battery Types (9/95), absurdengineering.org library. Duo Type I, II and III: which models they shipped with, relative life, how to tell them apart.
  22. ↑ 22.0 22.1 Apple Computer, Tech Info Library article 15484, PowerBook Duo: Type III Battery Q & A (8/95), absurdengineering.org library. Type III Q and A: red light on the recharger; updating an M1812 recharger through the Duo; System 7.5.1 needs the Type III Battery Extension to update the recharger.
  23. ↑ 23.0 23.1 23.2 Apple Computer, Tech Info Library article 13914, PowerBook Duo Batteries: Compatibility and Installation (8/95), absurdengineering.org library. Type II and III batteries usable on all Duos with the right software; Battery Reconditioning software only on the 270c, 280 and 280c; M2780LL/A Type III kit; recharger M1812 (M4178LL/B) charges all three types; M7778 only Type I.
  24. ↑ Apple Computer, Tech Info Library article 10832, PowerBook Duo: Battery Information 10/92, absurdengineering.org library. Duo NiMH pack: twice the self-discharge of NiCd; heat and cold limits; over-charge and over-discharge damage; power management chip in the Duo; discharge and recharge every 30 days.
  25. ↑ Apple Computer, PowerBook 550c Service Source, Basics, General Information (PDF p. 3). Hosted as File:PowerBook 550c Service Source.pdf.
  26. ↑ 26.0 26.1 26.2 Apple Computer, Tech Info Library article 16990, PB 500 Series: Intelligent Battery Recondition Software (1/97), absurdengineering.org library. Intelligent Battery Recondition software: what it fixes, when to run it, right-hand bay only, 7 to 12 minutes, do not interrupt.
  27. ↑ 27.0 27.1 68kMLA forum, "PowerBook 500 Series Battery Rebuild Failure (Oops, all dead EMMs!)", thread started 7 January 2024 (read 4 October 2026). Community repair report: two packs rebuilt with eight-cell AA NiMH packs whose EMM boards then failed to wake; Lind BU500, EMMpathy and Apple's Intelligent Battery Update used to test them; supply pins of the EMM's controller checked.
  28. ↑ Apple Computer, Tech Info Library article 17387, PowerBook 500 series: Battery Identification (3/95), absurdengineering.org library. 500-series battery revisions A to D and manufacturer codes BP (Panasonic) and BS (Sanyo).
  29. ↑ Apple Computer, Tech Info Library article 15541, PowerBook 500 Series: Priority of Dual Battery Charging (4/95), absurdengineering.org library. Two bays: the left battery is charged first and used first; maintenance charge.
  30. ↑ Apple Computer, Tech Info Library article 15704, PowerBook 500 Series: Battery Not Immediately Recognized (2/95), absurdengineering.org library. New battery can take 30 minutes or longer to be recognised; fixed by the Intelligent Battery Recognition software.
  31. ↑ Apple Computer, Tech Info Library article 15728, PowerBook 500 Series Battery: No Deep Discharge (6/95), absurdengineering.org library. 500-series batteries: no automatic deep discharge and none recommended; run down to automatic sleep and recharge every 90 days.
  32. ↑ 32.0 32.1 Apple Computer, Tech Info Library article 10571, PowerBook: Battery Shelf Life (6/94), absurdengineering.org library. Shelf life by chemistry; Intelligent Battery: six months fully charged, six weeks after discharging to shutdown; cool storage.
  33. ↑ Apple Computer, Tech Info Library article 17108, Intelligent Battery Recondition Software Troubleshooting (2/95), absurdengineering.org library. Recondition application stops at "Please attach AC adapter" when the adapter output is faulty.
  34. ↑ Apple Computer, PowerBook 500 Series Service Source, Troubleshooting, Symptom Charts/Power (PDF p. 36). Hosted as File:PowerBook 500 Series Service Source.pdf.
  35. ↑ Apple Computer, Tech Info Library article 18690, PowerBook 5300 & 190: Identifying LiIon & NiMH Batteries (10/95), absurdengineering.org library. Telling the 190/5300 LiIon and NiMH packs apart; LiIon packs to be returned to Apple immediately.
  36. ↑ Apple Computer, Tech Info Library article 18695, PowerBook 190 & 5300: Battery Voltage Measurements (10/95), absurdengineering.org library. 190/5300 NiMH voltages at full charge and at each low-battery warning, measured on ten batteries with a Fluke 77.
  37. ↑ Apple Computer, Tech Info Library article 21099, PowerBook 3400: Battery Recondition Software (3/97), absurdengineering.org library. The 3400 can use the 5300/190 NiMH battery; the reconditioning software tells LiIon users it is not needed.
  38. ↑ Apple Computer, Macintosh PowerBook 1400 Computer Developer Note (1996), Features, PDF p. 17. Hosted as File:PowerBook 1400 Developer Note (1996).pdf.
  39. ↑ 39.0 39.1 Apple Computer, Tech Info Library article 20469, PowerBook 1400 Series: Technical Specifications (11/96), absurdengineering.org library. PowerBook 1400 specifications: 30 Wh NiMH battery; Macintosh PowerBook Rechargeable Battery order number M4507.
  40. ↑ Apple Computer, Tech Info Library article 9866, PowerBook Batteries: Long-Term and Short-Term Storage 2/92, absurdengineering.org library. Short- and long-term storage rules for PowerBook batteries, 1992.


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