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T420 battery replacement

T400/410/420 and T500/510/520 series specific matters only
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T420 battery replacement

#1 Post by Garth » Mon Mar 26, 2018 4:11 pm

I want to replace my T420 6-cell battery with a new one but there seem to be several types of genuine Lenovo batteries available with different part numbers, each supposed to fit a T420. Is there any different between these different types (apart from the obvious 6-cell and 9-cell variations)? Does a battery with a higher part number denote an improved version? I have a type 4236-PGG T420.
(1) T420 i7, 8 Gb RAM, 128 Gb SSD, 500 Gb HD in Ultrabay, 1600x900, Win 10 Pro 64-bit
(2) T60p 2.16 GHz, 4 Gb RAM, 256 Gb SSD, 500 Gb HD in Ultrabay, 14" 1400x1050, Win 7 32-bit/XP dualboot
(3) T22 900mHz, 512 Mb RAM, 320 Gb HD, Win XP
(4) 600E 400mHz, 512 Mb RAM, 12 Gb HD, Win XP

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Re: T420 battery replacement

#2 Post by theterminator93 » Mon Mar 26, 2018 8:13 pm

The originals were the 55+ (6 cell) and 55++. These will work in the T410/420 and T/W510/520. The later model, the 70+ and 70++ have a security chip which allows them to be used in the T430, T/W530. The 55+/++ doesn't work in the later model, the 70+/++ works in the earlier model.
Daily: T25 | W520 i7-2860QM·Quadro 2000m·IPS FHD | T420 i7-2640M·NVS 4200m·IPS FHD | X220 i7-2640M·IPS FHD | T601F T9900·NVS 140M·LED UXGA
Wife's: T61p T9500·FX570m·WUXGA | X220T i7-2640M
Others: T61p·61·43·42p|X41T·24·23·22|G41|A31p·22m|i1200|TransNote|380D|365XD|701C|755C

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Re: T420 battery replacement

#3 Post by Thinkpad4by3 » Mon Mar 26, 2018 8:58 pm

Garth wrote:
Mon Mar 26, 2018 4:11 pm
Does a battery with a higher part number denote an improved version?
No, the battery number has nothing to do with its quality or revision. It is an arbitrary number specific to a machine lineup. Due note, the + or ++ on the end of a number signifies the size.
On a T61, the 88 battery was 4 cells, the 88+ was 6 cells, and the 88++ was 9 cells.

*: The T61's battery wasn't 88, I'm just using it for an example.
Thinkpad4by3's Law of the Universe.

The efficiency of two screens equally sized with equal numbers if pixels are equal. The time spent by a 4:3 user complaining about 16:9 is proportional to the inefficiency working with a 16:9 display, therefore the amount of useful work extracted is equal.

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