Cordless Tools 18V Li-Ion Cell Storage Open Voltage

[Midnight Oil]

Is it true that, just like any other li-ion batteries, those for cordless tools should not be stored at full charge?

If so, what is the ideal open voltage for an 18V li-ion cell when in storage?

Thanks.

 

[DM51]

Wrong forum... Moving it to Batteries...

 

[adam83]

You are correct, full charge speeds the aging process. 30-50% is a good storage SOC. My Ridgid 12v Li-Ion packs recommend the same thing. Assuming you have a 5s pack, OCV for storage should be around 19v (5 cells X 3.8v per cell) Avoid storage in hot or humid environments too!

I used to store my packs at nearly 100% SOC and they now have the resultant high internal resistance/decreased capacity to prove it. :sigh:

 

[Midnight Oil]

Thanks, David, for moving the thread.

I thought about starting it in this forum at first, but thought it didn't belong here because, though it is about a battery, it's not about flashlights.

Thanks, Adam.

So in essence, each individual li-ion cell should be stored at its nominal open voltage, around 3.7-3.8V. For a li-ion pack, that means the sum of the nominal open voltages of all the cells.