If they were NiMH, you could zap them.Slightly OT but the old computer was a portable with real Japanese Li-ion batteries. The batteries still hold a charge (not a lot but enough to boot windows 95) after being plugged in for a few hours.
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No way in hell the Chinese replacements would work after almost 30 years.
https://www.amazon.com/2200mAh-Replacement-Stylistic-CA54200-0090-VM-NP500H/dp/B08B3RS6DT



