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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 | T601F T9900·NVS 140M·IPS UXGA
Wife's: T61p T9500·2010 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.
Probably should be Thinkpad16by10.

Looking For: 386 laptop, IBM or not.

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