With all this fuss about fake chinese cells in Keeppower batteries, perhaps we can use something to measure the capacity without having to rip open a cell ?
I mean if a cell gives me 90% (or maybe 95?) or greater compared to what is advertised, then it is probably a genuine cell right ?
EDIT: Actually, I already have one of these Turnigy Accucel 6 chargers
Maybe I can use this to measure my 18650s ?
EDIT2 : I found the alligator clips which connect to this hobby charger.
Now how would I connect them to the flat ends of the 18650 ?
Was thinking tape but maybe I can grab some neodymium magnets from amazon ?
EDIT3: The reuslt is in. 2114mAh !!! (@1A discharge down to 2.70v)
Not bad at all for a 4 year old trustfire rated at 2500
Interestingly the protection never kicked on at 2.75 and it went down to 2.7 as I set my Accucel 6 to.
I’ll test the green panasonic 3400 protected from wallbuys as well as the keeppower 3400s when I get them (any day now)
EDIT4: The first Keeppower 18650 3400mah I just tested only gave me 3090 mAh… Discharged it down to 2.8V @ 1A using my Accucel 6
Worth noting that it has never been used and only charged once fully using a nitecore i4 and allowed to cool before discharging.
It has a Li-ion discharge function though. Why use the nimh mode ? Does it matter ? Btw trying to find my adapter for this Accucel. Haven’t used it in a bit lol
Oh sorry, didn’t explain that. It’s because manufacturers rate their battery capacity by discharging to 2.75V, and the charger cuts off at 3.00V, so it may not display its entire capacity, although it won’t be too much of a difference.
As for the resistance. It may be the gheto tape being used which might be making a bad contact on the terminals ? I need some magnets. Not sure where to get em fast. Im in canada btw.
It is bad to discharge Li-Ion cell below 3 volts open-circuit voltage, not under-load voltage. Cell discharged to 2.7V at 1A will pop up back to 3.2-3.5V as soon as you disconnect load from it.
The reuslt is in. 2114mAh !!! (@1A discharge down to 2.70v)
Not bad at all for a 4 year old trustfire rated at 2500
Interestingly the protection never kicked on at 2.75 and it went down to 2.7 as I set my Accucel 6 to.
I’ll test the green panasonic 3400 protected from wallbuys as well as the keeppower 3400s when I get them (any day now)