Hi all. Pretty new to things. Bought 8 used laptop batteries off eBay, 9 cell 7800mAH so 2600mAH each cell when new. The guy said if I want he has lots more of these packs.
So I broke open the first few packs and cleaned up the cells. They all read ~3.68v on my DMM which I think is a good thing, correct?
Next thing I did is throw the first four on my shiny new Opus BTC-3100 v2.2 to charge them up. It stopped at 4.17-4.18, which I though was a little weird - shouldn't it be 4.2?
Then more weirdness, I took the cells out of the Opus and checked them with my DMM and they read 4.47-4.48v!! Yikes! Pop them back in to the Opus and it shows them at 4.17-4.18!!
Any idea what is going on? Do I have a bad Opus? Do I have a bad DMM? Is this normal behaviour?
The cells all say "SBPM4L6" on them, if that matters. No hint as to what the brand is...
Thanks!
Alim.
So I broke open the first few packs and cleaned up the cells. They all read ~3.68v on my DMM which I think is a good thing, correct?
Next thing I did is throw the first four on my shiny new Opus BTC-3100 v2.2 to charge them up. It stopped at 4.17-4.18, which I though was a little weird - shouldn't it be 4.2?
Then more weirdness, I took the cells out of the Opus and checked them with my DMM and they read 4.47-4.48v!! Yikes! Pop them back in to the Opus and it shows them at 4.17-4.18!!
Any idea what is going on? Do I have a bad Opus? Do I have a bad DMM? Is this normal behaviour?
The cells all say "SBPM4L6" on them, if that matters. No hint as to what the brand is...
Thanks!
Alim.