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Most trustworthy seller(s) will also provide a list of devices that the battery is compatible. Now those lists are normally accurate, but obviously, the seller can't test every device so they are compatible on paper. The point is that a trustworthy seller will provide this list and offer a return policy. You should also avoid the "too good to be true" deals. There is a reason they are cheap, they are batteries from China, likely extremely old stock or the battery reports a fake capacity.
– Ramhound
Commented May 15, 2022 at 17:00
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It's entirely possible that the laptop hardware supports two battery voltages. But yes, your answer applies in the general case.
– jpa
Commented May 16, 2022 at 6:46
I'd be also concerned with the charging -- if the charging electronics aren't prepared to produce the voltage or if they refuse to charge with more than the original nominal voltage 11.9V + x in order to prevent battery damage, they wouldn't fully charge the 15.4V battery. Do you know anything about how intelligent the charging is these days? Do laptops communicate with the battery, say, querying voltage, temperature and max charging current?
– Peter - Reinstate Monica
Commented May 16, 2022 at 9:31
@Peter-ReinstateMonica Yes, absolutely. There are (were) ThinkPad models that could be used with various battery sizes. This battery, while internal, appears to use a similar connector.
– Daniel B
Commented May 16, 2022 at 9:54
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@DanielB Well, battery sizes could be easily accommodated by dumb chargers ("charge at x V until full"). Voltages are more delicate.
– Peter - Reinstate Monica
Commented May 16, 2022 at 9:57

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