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  1. #1
    Star Lounger
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    Larger AH battery in laptop?

    Hi, I have an old IBM T23 laptop (don't laugh, it looks and runs like new). The main battery died about 6 months ago and I finally decided to try and see if I could get a new battery for it. I found quite a few on amazon and picked one that looked the same and was described to fit T20 thru T23. It was the proper size voltage wise (10.8V) and was 4.4AH. I ordered it and when it came I saw that it was 5.2AH. My question now is: Will the T23's system board / charger handle this larger capacity battery. I haven't yet put the new battery in, and won't until I'm sure it won't burn something up. I normally run it on the AC powerpack anyway. Is there anyone out there with knowledge of old thinkpads that can help me? Thanks.

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  3. #2
    4 Star Lounger access-mdb's Avatar
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    I had this same issue with my wife's laptop. A friend (who runs his companies IT section) told me, and I quote:

    "The difference in battery capacity shouldn't be a problem. It'll definitely last longer than the current one! At work I often buy replacement batteries with larger mAh numbers as that just indicates the charge capacity. As long as it physically fits and outputs the same voltage it'll be fine."

    I doubt that it being an old thinkpad will make a difference.

  4. #3
    Platinum Lounger
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    Newer batteries have higher capacity for the same physical size. Higher capacity ones will charge from a lower output charger without issue, though it may take a little longer. (Battery charge is a function of battery voltage, not input current. A low input current at the correct voltage will charge any capacity battery, within reason.)

    cheers, Paul

  5. #4
    Star Lounger
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    Thanks very much to both of you, you've put me at ease about this.

  6. #5
    4 Star Lounger
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    A note: most all Notebooks/Laptops are limited in what will fit in the limited room they have. Sometimes the higher-capacity batteries won't fit the cavity for the battery or it may be thicker than the original, prop the case up differently.

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