Lith-Ion Batteries
Jan 4, 2021 17:04:15 #
aphelps wrote:
Once the battery is below its critical voltage (for a 3.7 volt cell that is about 2.8 volts), it is damaged permanently. Even if you can boot it up to or over 2.8 volts you still have a damaged battery. Nothing you can do will fix it. Why take chances with a damaged li-ion battery????
I’m not so sure about that. The reason for the low voltage cut off is to prevent high current and subsequent overheating when charging a low voltage Li Ion cell, which will draw excessive current if NOT current limited until a critical voltage is reached. I’ve “saved” a number of Li Ion batteries that have dropped below the cut off voltage, and they’ve all continued to operate in a normal manner, and there is no danger in using them. BUT if you can provide a reference link from a knowledgeable source that says there is permanent damage which makes the battery unusable, please post it - I’m always ready to learn.
Jan 4, 2021 17:16:14 #
captivecookie
Loc: Washington state
aphelps wrote:
If your rechargeable AAs are not li-ion, no worries. NiMH batteries do not suffer from undervoltage. They can be discharged to zero and still recharge.
Thanks, that is a relief.
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