I’ve never had this happen before. I ordered two 14500 batteries from Bangood last month and they arrived well packed and even had the little black terminal stickers for safety attached to them which impressed me greatly, however when I put them on to charge they were rated at 0% which is unusual, to say the least and will not charge. Now normally I would immediately complain and ask for a refund but these are protected cells which I have no experience of. Am I doing something wrong?
Maybe the protection has tripped, and you need to reset it.
Post 2 here explains one method of resetting (I can’t find HKJ’s original explanation)
That is worth looking at so thanks for that. It is a worry if it can trip that easily though especially as both ends were covered with a sticker and they were so well packed.
Lots of things can trip the protection even cells being to hot. Most likely they fell below the minimum charge so the protection kicked in for safety. Jump start them and use a multimeter to check the voltage.
Which brand and model?
Getting 2 batteries at 0 voltage would be unusual in my opinion. More likely that the protection tripped like others have said.
Can you confirm that Voltage is 0V (using DMM)?
Or there is some voltage (usually below 2V)?
If the PCB trippes in my Jetbeam Jet-1 MK at 2.5V, as it has a buck driver, the DMM shows 0V
As soon as I put it in the charger the battery voltage is back to 2.7V and climbing fast
maybe the protection chip is in a sleep state?
shipped in an ultra low drain state for long shelf life?
some bms chips support this but have yet to see it in a single cell bms.esp basic ones like these.