Portable speakers and singing machines are one of the most common replacement jobs we see. The speaker itself is usually fine; the pack inside has simply reached the end of its life.
Why these packs are always custom
The battery compartment in a speaker is designed around the original pack, and there is rarely a standard cell block that fits it. We build to the space: the cell arrangement, the position of the leads and the connector all follow what is already in the housing.
The two things that matter
- Physical fit. Length, width, depth and where the wires exit. A pack that is 3mm too tall does not go in.
- Current. An amplifier at volume draws far more than its average figure suggests, and a BMS chosen on capacity alone will cut out on bass peaks. We size the BMS to the draw, not to the pack size.
Usually worth more capacity
Cells available now hold more energy in the same volume than the ones in a speaker built several years ago. In most rebuilds we can fit noticeably more runtime into the identical space, for very little extra cost.
What to send
A photo of the old pack including its label, a photo of the compartment, and the model of the speaker if you have it. That is normally enough for a quote.
Send us the voltage, capacity, discharge current and the space you have — or a photo of the battery you are replacing. We will come back with a specification and a price.