DIY Fix: Replace HAVIT M8 Bluetooth Speaker Battery

For those interested in DIY Bluetooth speaker battery replacements, this guide might be just what you need.

The HAVIT M8 Bluetooth speaker stopped working—even after an hour of charging, there was no response. Unsurprisingly, the battery was completely dead and noticeably swollen when opened up. If you're facing the same issue and can't find an exact replacement battery, here's a step-by-step DIY solution to replace it.

Here's a look at the full appearance of the speaker:

This Bluetooth speaker runs on a 5V, 500mA input power supply, with an output power of 3W.

The screws aren't hidden under the speaker's foot pads as you might expect. Instead, you'll need to remove the outer frame to reveal them underneath.

The internal structure is laid out as follows, including the battery section:

There are three LED lights arranged in a circle, most likely for ambient lighting.

Here are some close-ups of the lights around the speaker:

Now, onto the battery section:

The battery is severely swollen—thick enough that it's best to remove and discard it immediately.

Replacing it is straightforward: find a matching battery and install it in place of the old one.

Here's a close-up of the mainboard:

Some details of the components:

And here's the USB port section:

The speaker assembly wasn't done properly—even one of the gasket rings was sticking up.

It looks like the speaker was already poorly assembled during manufacturing. The gasket on the outside is deformed and cracked, which was probably intended to help with bass performance.

When powered on, the blue ambient lights look like this:

However, when playing music, the audio stutters. This is likely due to insufficient current from the battery. If the sound plays more smoothly at lower volumes, that's a clear sign the battery can't keep up. You might consider further modifications to improve it.

That's the full DIY walkthrough—job done.