Mine has just stopped taking charge.

Oh, the on button is broken as well...

EDIT:

It's the Theragun Elite (https://www.therabody.com/uk/en-gb/elite...) from a few years back - there is no swappable battery. Will post pictures tomorrow.

EDIT 31/12/2024

Still not completely given up and still massively encouraged and grateful for commenters so far - thank you.

Found this page that shows the battery in question but I can't read the langauge so no idea...I can't find a replacement battery, sadly.

10.8V锂电池组，6V电源适配器，数显光纤放大器 - 〓器材友情交换〓 - 矿石收音机论坛 - Powered by Discuz!

Theragun Elite (white) pictures to support recent teardown efforts.

Still not found a battery source.

⟐ Answered October 12, 2025 at 15:26 MST

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...

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=sujrpwjt... 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!

⟐ Commented August 19, 2025 at 14:11 MST

⟐ Edited by author October 14, 2025 at 7:04 MST