6
\$\begingroup\$

For Lithium-ion rechargeable batteries, that have never been charged, or been charged like 2-3 times at most, some 2-3 years back, and having since-then been in packaged condition, what should I expect their condition to be ?

Reading this wiki entry, I understand the thing about self discharge-rate and durability in terms of recharge cycles, but haven't found much credible information about unused cell's shelf life. Do they degrade over time, if not used ?

PS> Reason for asking is because someone is offering me a small cache for such batteries (to used within RFID readers), for what appears to be a very good bargain.

\$\endgroup\$
7
\$\begingroup\$

Yes, Lithium-ion bateries degrades over time, even if unused. It is due to a chemical/physical reaction that starts right after manufacturing of the cells.

I can't answer on the state of your batteries. Because it highly depends on the storage temperature and also the charging level of the cells during the storage.

I don't remember the optimal number, and if you know it, don't hesitate to modify my answer, but AFAIK it was around 60%. Thus if you want to reduce the aging effect, you should store your cells at 60% charge. I don't remember the optimal value for the temp.

\$\endgroup\$
  • \$\begingroup\$ Thanks @Blup1980. I've read about the optimal storage charge level being between 40-60%, but had not seen any authoritative statement regarding general shelf-life, which is apparently affected by "ageing". Alkaline batteries seem to have a typical shelf-life of 7-8 years, but I am guessing anything similar cannot be said for Li-ion. \$\endgroup\$ – icarus74 Jan 21 '13 at 17:24

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.