How to shock batteries

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Theragun Elite

The Theragun Elite is a massage gun from Therabody.

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pipfpcuu @pipfpcuu

İtibar: 1

Gönderildi: 5 Nis 2025

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How to shock batteries

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...

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!

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jayeff @jayeff İtibar: 498,6b 11 385 1,5b · Answer 1 · 2025-04-05T23:45:25-07:00

Hi @pipfpcuu

Best option is to replace the individual battery cells or even all of them depending on their condition.

If a battery cell is faulty then you cannot "shock" the entire battery back to normal. At best you could do this to an individual battery cell, but then it would have to be disconnected from the other cells to hopefully work. It may be that the battery cell has failed beyond recovery

If you have a DMM (digital multimeter) you can use it to find out which of the individual battery cells may be still OK and which ones aren't. To do this it is best to disconnect each battery cell from the wiring harness so as to not get misleading information as to the voltage charge that it still has remaining.

You would also need a soldering iron and some tools to do the testing (and if necessary any replacements).

As for the wiring take pictures and write everything down e.g. wires colours on which battery terminal (+ve and -ve - which are marked on the battery) for every battery cell in the battery pack, if two the same coloured wires in harness but going to different cells mark each one as to which goes where etc. Basically you will have a drawing showing how everything is connected in the battery

If you decide to opt for replacing the battery cell(s), search online for the (insert cell model information - printed on each battery cell) with solder tabs to find suppliers that suit you best. Usually they're 18650 type cells but a lot depends on their voltage rating (V) and their current capacity (usually expressed in mAH - milli AmpereHours) as to which ones you'll need

Here's a link just to show you images of 18650 type batteries which have solder tabs so that you can see how easy it would be to solder two batteries together and also how to solder wires onto the battery itself.

There are also rechargeable batteries without solder tabs but it is too dangerous trying to solder anything to them as you have to apply too much heat. Better using the ones with the tabs already factory fitted as the soldering is quickly done without applying too much heat for too long.

Theragun Elite

How to shock batteries

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