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Thinkpad T42 battery replacement (different current)

T40/T41/T42/T43 Series
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xpr
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Joined: Thu Mar 08, 2012 4:19 pm
Location: toronto, ontario Canada

Thinkpad T42 battery replacement (different current)

#1 Post by xpr » Thu Mar 08, 2012 4:27 pm

Hi,


My original battery is 10.8v and 4.4ah, which became unable to be recharged after 5 years' extensive use. Today I bought a new one, same voltage (10.8v) but slightly different current (4.6ah).

Now I am charging it. The AC adapter feels very hot! (The new battery once stopped charging after reaching 18% of its full capacity, but after discharging it a little bit, it resumed the charging process, presently having reached 76%.)


My concern:
Is it safe to use the new battery, given that there is a 0.2ah difference in current?


Thanks!

RealBlackStuff
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Re: Thinkpad T42 battery replacement (different current)

#2 Post by RealBlackStuff » Thu Mar 08, 2012 4:43 pm

The 4.6Ah only means that it has a larger capacity than your previous battery.
You can even get (9-cell) batteries with 7.2Ah.
All of them are 10.8V.
Check that you only use an original IBM charger (16V/72W/4.5Amp).
Lovely day for a Guinness! (The Real Black Stuff)
Lenovo: X240, X250, T440p, T480, M900 Tiny.

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xpr
Posts: 13
Joined: Thu Mar 08, 2012 4:19 pm
Location: toronto, ontario Canada

Re: Thinkpad T42 battery replacement (different current)

#3 Post by xpr » Thu Mar 08, 2012 4:51 pm

Thanks for your reply. For "IBM charger" do you mean "IBM AC Adapter"?

Mine is the original IBM AC Adapter with the following specifications:

INPUT: 100-240V ~ 1.9A
OUTPUT: 16V = 4.5A
It does not show 72W anywhere on the body of the adapter.



RealBlackStuff wrote:The 4.6Ah only means that it has a larger capacity than your previous battery.
You can even get (9-cell) batteries with 7.2Ah.
All of them are 10.8V.
Check that you only use an original IBM charger (16V/72W/4.5Amp).

RealBlackStuff
Admin Emeritus
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Posts: 23809
Joined: Mon Sep 18, 2006 5:17 am
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Re: Thinkpad T42 battery replacement (different current)

#4 Post by RealBlackStuff » Thu Mar 08, 2012 5:01 pm

That's the correct one.
Lovely day for a Guinness! (The Real Black Stuff)
Lenovo: X240, X250, T440p, T480, M900 Tiny.

PS: the old Boardroom website is still available on the Wayback Machine
.

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