Battery life or how long does it stay charged stored?

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pepperbelly

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Location
Fort Worth, Texas
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I dug down into my dive bag and “found” a light that has been missing. It’s a DHX 600.
I last used it 2 or more years ago and I am sure it wasn’t charged before losing it. I twisted it and it came on- surprising the heck out of me, and slightly blinding me.

How long do these usually stay charged?
 
Good question. I have some Big Blue VL4200P that have not been charged since last November and light up and still have green showing on the power level.
 
li-ion batteries have a very low rate of self discharge, 1-2% per month
 

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