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I needed a way to keep my battery topped up for a car that sets all winter. I used to remove the battery in the fall and put it back the next spring. Eventually I bought a small 10 watt panel. The car is in a public lot, so I wanted a way to put the panel inside and I only wanted to float...

I was down at the scrap yard and found some lithium batteries. The guy said they couldn't use them and I could take them if I wanted. They are Samsung 30Q cells, 10s3p. "pink gold" 3 of the cells had low voltage about 1.8v, the rest had voltage between 3.8 and 4 volts. They are from a Hoover...

I just checked a few 18650 prices online. The lowest I found was like $10. per cell. It wasn't long ago that a high quality cell could be bought for about $3.50. What happened? These cells are made from lithium not gold, right?

Suppose you charge an 18650 cell to 4.2 volts and let it sit unused for a week. What would you consider acceptable voltage loss before discarding the cell?

Thanks, I didn't know that. Still trying to figure out which cells to keep and which to discard.

Yes, that's more like it. Maybe 18650batterystore is where I was looking before. I have seen batteryhookup and they have good value but large order. Thanks!

Ok, thanks. I checked the datasheet for Samsung 30Q and they state 2.5v. I'm using ZB2L3 tester. The listing page of the seller says stopping voltage is set with + - buttons with voltage after P. Default shows P3.0 but it doesn't stop at 3v. Latest test, it stopped at 3.25v. I've also had it...

What is the typical stopping voltage to set your tester when capacity testing 18650 cells ? Thanx