hi everyone. I need a little help with some charging circuits for some large bluetooth speakers I am making. I aam planning on using some dewalt/makita/whatever brand power tools batteries for my power source, I need one 12V, one 18V and one 24V. So I am thinking I can just wire some 12V batteries in series for the 24V and using and just adding whatever I need in parallel to get the mAh I need. was thinking to go thiis route for simplicity, ie, a lot of the protections/bms is already included. So I am planning on using a slide on charger that goes to a DC wall adapter, getting one for each battery and removing the wall adapter plug and then wiring those ends together and adding a female dc barrel connector which will suface mount to the speaker enclosure. Then I will use one of the dc adapter wall plugs I removed from the chargers and add a dc male barrel plug to connect to the female connector for charging the batteries. Does anyone see any issues with this? is it so stupid that I should scrap the entire plan and try something else? I would love some advice or help. Thanks

 

Welcome to AAC.

The first problem you are going to have is the power supply. It is almost certainly not going to be big enough to handle mutliple batteries and so the charge time will be exceedingly long.

Exactly how many power tool batteries do you plan to use? Which brand? What capacity (in Ah)?

More information will help answer your question much more easily.

(As an aside, it’s not extremely important but when you say “surface mount to the speaker enclosure” I think you mean panel mount. This is something very different and using the right terminology will go a long way in reducing confusion.)

 

Word Salad- draw a diagram of the concept.

 

.

.
.
.

 

Welcome to AAC.

The first problem you are going to have is the power supply. It is almost certainly not going to be big enough to handle mutliple batteries and so the charge time will be exceedingly long.

Exactly how many power tool batteries do you plan to use? Which brand? What capacity (in Ah)?

More information will help answer your question much more easily.

(As an aside, it’s not extremely important but when you say “surface mount to the speaker enclosure” I think you mean panel mount. This is something very different and using the right terminology will go a long way in reducing confusion.)

Thanks for reply. Ok, for the first issue, when you say power supply I assume yoiu are referring to the wall charger I mentioned. If it will be too weak, I can get something more powerful. One of the main reasons I was thinking to do it this way is because I have access to the batteries (and also ac/dc adapters/ power supplies) for free. So if I can determine what voltage/current I need for the charger I can most likely get my hands on one. The brand of battery doesn't really matter as I have access to most of them. But if it doesn't matter I will probably go with Makita as they seem to be available in higher numbers. The mAh is also flexible. If it doesn't matter I wiil probably go with one of the higher capacities, just because more capacity, Lol. One of the amps needs 12V and at least 5A supplied. One other amp needs a min of 20V 5A supplied in ordered to output the wattage needed, but can handle as much as 24V 5A, The last one needs the full 24V 5A available to be able to output the needed watts. Possibly I may need one to supply 36V 5A but don't know about that yet.

And thank you for correcting my usage of surface mount. I am familar with the term when used regarding the way components/ic are soldered to a pcb, but I couldn't think of a better term (and I guess I didn't know ther term was so specific). Panel mount does seem much better, and certainly less confusing.

I really appreciate the help. I hope I've given whatever information you've requested. Thanks.