Battery Refurbishment: Difference between revisions

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| '''NiMH pack overheats on charge''' || Charger expecting NiCd's larger −ΔV; thermistor not touching a cell || Refit the thermistor correctly against a cell; consider staying with NiCd

|}

== Apple's own replace-below thresholds ==

Apple's ''Service Source'' volumes each print a '''Battery Verification''' procedure with a

replace-below figure, and '''the figure is not the same across the range'''. Transplanting one

machine's threshold onto another is a real and repeated error: a cell that is fine in one family is

due for replacement in the next. Every figure below is quoted from the machine's own manual, all of

which are hosted here.<ref name="ssbatt">Every threshold in this table was read from the

''Battery Verification'' section of the ''Additional Procedures'' chapter of the machine's own Apple

''Service Source'' volume, each of which is hosted on this wiki and linked from the table. Apple's

procedure is the same in each case: set the meter to the '''10 V DC''' range, positive probe to

the positive end of the cell and negative probe to the negative end, and replace the cell if it

reads below the figure printed for that machine.</ref>

{| class="wikitable styled-table"

|-

! Replace below !! Machines, by the volume that says so !! Notes

|-

| '''2.8 V''' || [[Macintosh SE Service Source|Macintosh SE]], [[Macintosh SE/30 Service Source|SE/30]], [[Macintosh IIcx/IIci/ Quadra 700 Service Source|Macintosh IIcx, IIci and Quadra 700]] || The SE and SE/30 procedures require the cover off, '''the CRT discharged''' and the logic board removed before the cell is measured.

|-

| '''3.0 V''' || [[Macintosh IIsi Service Source|Macintosh IIsi]], [[Macintosh LC Series/ Quadra 605 Service Source|LC, LC II, LC III, LC 475 and Quadra 605]], [[Macintosh LC 520/550/575 Service Source|LC 520, 550 and 575]], [[Macintosh LC 580/ Performa 580CD Service Source|LC 580 and Performa 580CD]], [[Macintosh TV Service Source|Macintosh TV]], [[Macintosh Performa 400 Series Service Source|Performa 400 series]], [[Performa 500 Series Service Source|Performa 500 series]], [[Performa 6200/6300 Series Service Source|Performa 6200/6300 series]], [[Power Macintosh/Performa 5200 and 5300 Service Source|Power Macintosh/Performa 5200 and 5300]], [[Power Macintosh/Performa 5260, 5280 Series Service Source|5260 and 5280]], [[Power Macintosh/Performa 5000 Series Service Source|5400 and 5500]], [[Performa/Power Macintosh 6400 and 6500 Series Service Source|6400 and 6500 series]], [[Power Macintosh 4400 Service Source|Power Macintosh 4400]] || The all-in-one machines are measured with the '''I/O door and the logic board removed'''.

|-

| '''3.2 V''' || [[Macintosh II/IIx/IIfx Service Source|Macintosh II, IIx and IIfx]], [[Macintosh Quadra 610/ Centris 610/WS 60 Service Source|Quadra 610, Centris 610 and WS 60]], [[Macintosh Quadra 800/WS 80 Service Source|Quadra 800 and WS 80]], [[Macintosh Quadra 840AV Service Source|Quadra 840AV]], [[Macintosh Quadra 900/950/ AWS 95 Service Source|Quadra 900, 950 and AWS 95]], [[Power Macintosh 6100/ WS 6150 Service Source|Power Macintosh 6100 and WS 6150]], [[Power Macintosh 7100 Series Service Source|7100 series]], [[Power Macintosh 8100/ WS 8150 Service Source|8100 and WS 8150]] || The Quadra 800 and Power Macintosh 8100 procedures require the logic board out first.

|-

| '''4.5 V, user-replaceable''' || [[Macintosh Service Source|Macintosh 128K and 512K]] || Not a lithium cell. Apple's own parts list for the analogue board names it as an '''Eveready 523, 4.5 V''' battery, so leakage from it is '''alkaline''' and is neutralised with vinegar — bicarbonate is for the lithium machines above.

|-

| '''no figure published''' || [[Macintosh Performa 630 Series Service Source|Performa 630 series]], [[Power Macintosh 8200 and 8500 Series/WS 8550 Service Source|Power Macintosh 8200/8500 and WS 8550]], [[Power Macintosh 9500 Series Service Source|9500 series]], [[Power Macintosh 7300/ 7500/7600 & WS 7350 Service Source|7300/7500/7600 and WS 7350]], [[Twentieth Anniversary Macintosh Service Source|Twentieth Anniversary Macintosh]] || These volumes have '''no Additional Procedures chapter and no battery verification step at all'''. A bare number in an Apple symptom chart is a section cross-reference in Apple's own numbering, not a voltage.

|}

Two practical consequences. First, '''measure before you condemn''': a 3.1 V cell is a

replace on a Quadra 840AV and a keep on a Macintosh IIsi. Second, '''the chemistry changes with the

voltage''': the 3.0 V and 3.2 V machines take lithium cells, which vent and leave acidic

residue, while the 128K and 512K take an alkaline 4.5 V pack, whose leakage is alkaline. The

neutralising agent is the opposite in the two cases — see

[[Battery Explosion, Capacitor or Corrosion Damage]].

Apple also prints a warning with several of these procedures, in its own words: if handled or

discarded improperly, the lithium battery '''could explode'''.<ref name="ssbatt" />

'''The Macintosh Portable is the exception in this family.''' Its main battery is a '''sealed

lead-acid''' pack, '''6.5 V''', good for up to ten hours, with a '''9 V transistor cell'''

as the backup and a power adapter delivering '''7.0–7.6 V''' (7.5 V nominal) at

5 mA–2.0 A.<ref name="ssport">Apple Computer, ''Macintosh Portable'' Service Source,

151 pp, PDF distilled 19 January 1996. Hosted here as [[Macintosh Portable Service Source]]

([[:File:Macintosh_portable.pdf]]). Specifications — Electrical.</ref> ''The Macintosh Bible'',

fourth edition, adds the figure that matters when one of these turns up: a Portable pack that has

fallen '''below 5.4 V''' can no longer be recharged by the machine.<ref name="macbible4">

Hosted here as [[The Macintosh Bible 4th edition 1992]]. Secondary source.</ref> A pack in that state

needs an external charge or replacement cells; the machine will not bring it back on its own.

== Manufacturer battery data on this wiki ==

Line 700:

Line 751:

* [[Recommended Tools]]

* [[Capacitor Failure Symptoms]]

* [[Macintosh Portable Service Source]] — Apple's specification for the lead-acid pack

== References ==

@@ Line 690: / Line 690: @@
 | '''NiMH pack overheats on charge''' || Charger expecting NiCd's larger −ΔV; thermistor not touching a cell || Refit the thermistor correctly against a cell; consider staying with NiCd
 |}
+== Apple's own replace-below thresholds ==
+Apple's ''Service Source'' volumes each print a '''Battery Verification''' procedure with a
+replace-below figure, and '''the figure is not the same across the range'''. Transplanting one
+machine's threshold onto another is a real and repeated error: a cell that is fine in one family is
+due for replacement in the next. Every figure below is quoted from the machine's own manual, all of
+which are hosted here.<ref name="ssbatt">Every threshold in this table was read from the
+''Battery Verification'' section of the ''Additional Procedures'' chapter of the machine's own Apple
+''Service Source'' volume, each of which is hosted on this wiki and linked from the table. Apple's
+procedure is the same in each case: set the meter to the '''10&nbsp;V DC''' range, positive probe to
+the positive end of the cell and negative probe to the negative end, and replace the cell if it
+reads below the figure printed for that machine.</ref>
+<templatestyles src="Template:StyledTable/styles.css" />
+{| class="wikitable styled-table"
+|-
+! Replace below !! Machines, by the volume that says so !! Notes
+|-
+| '''2.8 V''' || [[Macintosh SE Service Source|Macintosh SE]], [[Macintosh SE/30 Service Source|SE/30]], [[Macintosh IIcx/IIci/ Quadra 700 Service Source|Macintosh IIcx, IIci and Quadra 700]] || The SE and SE/30 procedures require the cover off, '''the CRT discharged''' and the logic board removed before the cell is measured.
+|-
+| '''3.0 V''' || [[Macintosh IIsi Service Source|Macintosh IIsi]], [[Macintosh LC Series/ Quadra 605 Service Source|LC, LC II, LC III, LC 475 and Quadra 605]], [[Macintosh LC 520/550/575 Service Source|LC 520, 550 and 575]], [[Macintosh LC 580/ Performa 580CD Service Source|LC 580 and Performa 580CD]], [[Macintosh TV Service Source|Macintosh TV]], [[Macintosh Performa 400 Series Service Source|Performa 400 series]], [[Performa 500 Series Service Source|Performa 500 series]], [[Performa 6200/6300 Series Service Source|Performa 6200/6300 series]], [[Power Macintosh/Performa 5200 and 5300 Service Source|Power Macintosh/Performa 5200 and 5300]], [[Power Macintosh/Performa 5260, 5280 Series Service Source|5260 and 5280]], [[Power Macintosh/Performa 5000 Series Service Source|5400 and 5500]], [[Performa/Power Macintosh 6400 and 6500 Series Service Source|6400 and 6500 series]], [[Power Macintosh 4400 Service Source|Power Macintosh 4400]] || The all-in-one machines are measured with the '''I/O door and the logic board removed'''.
+|-
+| '''3.2 V''' || [[Macintosh II/IIx/IIfx Service Source|Macintosh II, IIx and IIfx]], [[Macintosh Quadra 610/ Centris 610/WS 60 Service Source|Quadra 610, Centris 610 and WS 60]], [[Macintosh Quadra 800/WS 80 Service Source|Quadra 800 and WS 80]], [[Macintosh Quadra 840AV Service Source|Quadra 840AV]], [[Macintosh Quadra 900/950/ AWS 95 Service Source|Quadra 900, 950 and AWS 95]], [[Power Macintosh 6100/ WS 6150 Service Source|Power Macintosh 6100 and WS 6150]], [[Power Macintosh 7100 Series Service Source|7100 series]], [[Power Macintosh 8100/ WS 8150 Service Source|8100 and WS 8150]] || The Quadra 800 and Power Macintosh 8100 procedures require the logic board out first.
+|-
+| '''4.5 V, user-replaceable''' || [[Macintosh Service Source|Macintosh 128K and 512K]] || Not a lithium cell. Apple's own parts list for the analogue board names it as an '''Eveready 523, 4.5 V''' battery, so leakage from it is '''alkaline''' and is neutralised with vinegar — bicarbonate is for the lithium machines above.
+|-
+| '''no figure published''' || [[Macintosh Performa 630 Series Service Source|Performa 630 series]], [[Power Macintosh 8200 and 8500 Series/WS 8550 Service Source|Power Macintosh 8200/8500 and WS 8550]], [[Power Macintosh 9500 Series Service Source|9500 series]], [[Power Macintosh 7300/ 7500/7600 & WS 7350 Service Source|7300/7500/7600 and WS 7350]], [[Twentieth Anniversary Macintosh Service Source|Twentieth Anniversary Macintosh]] || These volumes have '''no Additional Procedures chapter and no battery verification step at all'''. A bare number in an Apple symptom chart is a section cross-reference in Apple's own numbering, not a voltage.
+|}
+Two practical consequences. First, '''measure before you condemn''': a 3.1&nbsp;V cell is a
+replace on a Quadra 840AV and a keep on a Macintosh IIsi. Second, '''the chemistry changes with the
+voltage''': the 3.0&nbsp;V and 3.2&nbsp;V machines take lithium cells, which vent and leave acidic
+residue, while the 128K and 512K take an alkaline 4.5&nbsp;V pack, whose leakage is alkaline. The
+neutralising agent is the opposite in the two cases — see
+[[Battery Explosion, Capacitor or Corrosion Damage]].
+Apple also prints a warning with several of these procedures, in its own words: if handled or
+discarded improperly, the lithium battery '''could explode'''.<ref name="ssbatt" />
+'''The Macintosh Portable is the exception in this family.''' Its main battery is a '''sealed
+lead-acid''' pack, '''6.5&nbsp;V''', good for up to ten hours, with a '''9&nbsp;V transistor cell'''
+as the backup and a power adapter delivering '''7.0&ndash;7.6&nbsp;V''' (7.5&nbsp;V nominal) at
+&nbsp;mA&ndash;2.0&nbsp;A.<ref name="ssport">Apple Computer, ''Macintosh Portable'' Service Source,
+pp, PDF distilled 19 January 1996. Hosted here as [[Macintosh Portable Service Source]]
+([[:File:Macintosh_portable.pdf]]). Specifications — Electrical.</ref> ''The Macintosh Bible'',
+fourth edition, adds the figure that matters when one of these turns up: a Portable pack that has
+fallen '''below 5.4&nbsp;V''' can no longer be recharged by the machine.<ref name="macbible4">
+''The Macintosh Bible'', fourth edition, Peachpit Press for Goldstein & Blair, copyright 1987–92.
+Hosted here as [[The Macintosh Bible 4th edition 1992]]. Secondary source.</ref> A pack in that state
+needs an external charge or replacement cells; the machine will not bring it back on its own.
 == Manufacturer battery data on this wiki ==
@@ Line 700: / Line 751: @@
 * [[Recommended Tools]]
 * [[Capacitor Failure Symptoms]]
+* [[Macintosh Portable Service Source]] — Apple's specification for the lead-acid pack
 == References ==

Battery Refurbishment: Difference between revisions

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