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  • Just to confirm - you have an older laptop that you still want to use running on battery. It's not a desk-princess laptop; it actively gets moved about while running ?
    – Criggie
    Commented Dec 26, 2023 at 8:49
  • It's OK for the laptop but maybe not so OK for the battery. 3.6V and 3.7V cell are usually charged to 4.2V and the charging circuit for a 3.75V cell may charge it to a bit higher, E.G. 4.25V. The battery cell in smartphones now are 3.85V nominal and can charge to 4.45V. If you care about safety, check the “charge terminate voltage” Commented Dec 26, 2023 at 10:26
  • @Criggie: yes, I still use it for some stuff.
    – Dejan Govc
    Commented Dec 27, 2023 at 11:07
  • @DejanGovc just confirming you need it on battery ? It is eminently possible to run most laptops with no batteries installed.
    – Criggie
    Commented Dec 28, 2023 at 7:21
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    Get the battery closest in voltage to your existing one and try it. You can ask the supplier to confirm that it will work before you buy it. Commented Jan 17 at 12:04