I got an extra battery pack for my Acebeam X50 CRI (review coming soon) so I tore it down for science.
Acebeam puts a really tough epoxy over the screws on both ends of the battery tube, which is unfortunate. The ones on the tailcap were easy enough to remove with a dull xacto knife to scrape out the epoxy, and a high quality torx T6 bit to unscrew them.
The little cap on the end was hard to grip, so I just stuck it to a solid object with some double sided tape and pulled. That did the trick. Inside there’s this neat charging board thing. I only see two wires,
so there doesn’t appear to be any balance circuitry. I don’t know what any of these components are but hopefully this will be useful to some of you.
At this point the battery pack (which is attached to the PCB) wants to slide out the tail, but it can’t because of the wires connecting it to the PCB on the other end.
The screws on the other end were torx SECURITY T6, filled with epoxy again. I just couldn’t get the epoxy out and didn’t have a security bit, so I just ground the screw heads off with a dremel and voila. You can see the two beefy wires soldered to this PCB.
I desoldered the two wires, covered them in heatshrink, and the whole pack slid out the tail easily.
There are three Molicel P42A’s.
Upon further disassembly I found a second PCB hiding inside the pack under the wrapper. Could this be a BMS?
Here are both sides. What do you guys think?
It wasn’t nearly as difficult as I expected to remove the nickel strips. The ends of the cells are looking pretty rough though. Any ideas on how I can clean them up a bit?
The cells came unglued with some careful force. The glue is relatively soft and foamy so I was able to remove it with some careful slicing with a very sharp knife.
Here’s the inside of the tube.