My theragun elite isn't working, and I'm pretty sure it's a battery problem. The device will charge from 0% to 33%, but once unplugged... it's back down to 0% (it doesn't turn on, claims to be out of battery, and shows 0% when plugged back in).
The device hasn't been used much. I think I threw it into a cupboard at 0% a long time ago, and it's been sitting there for 2+ years.
I've disassembled the device and found what looks like three battery cells with soldered wires. I'm familiar with the concept of 'shocking' rechargable batteries to fix them - e.g. connecting a bad empty AA rechargable battery with a full AA battery, using two wires, to fix the bad battery.
I'm hoping the problem here is similar to a bad AA rechargable, and can be fixed with a similar process. Unfortunately I don't really have much experience with electronics and not really sure how to proceed here. Hoping for some advice...
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***Is it possible to shock these batteries to life WITHOUT having to cut and re-solder things?***
I don't have the equivalent or skills to solder anything :(
Can I take a good battery and just use a wire to connect the - end to the exposed metal end (top picture), and the + end to the metal in between the two batteries (bottom picture) ?
***What kind of good battery should I use?***
I've previously revived dead AAs using a good AA... but am I going to need a bigger battery here? If so, how big of a battery do I need?
I'm guessing a single good AA isn't going to have enough 'juice' to fix these three bigger batteries.
***Safety concerns***
When shocking AAs, I just hold the wire with my finger. (e.g. as shown in this youtube video: https://www.youtube.com/watch?v=sujrpwjta4k you just use your finger to press a wire against the end of a battery).
Should I take care to not touch any of the exposed metal / wires when I do this, because these batteries are bigger?
***I'm willing to buy some things***, if there are cheap things/tools that will make this a lot easier to fix.
***I'm not interested to buy replacement batteries***. This isn't about the money, but rather because of the way all the wires are soldered onto the batteries, I don't think I will be able to make replacement batteries work (i.e. get all the wires connected in the correct way, etc.)
Thanks heaps!