Build a camcorder battery, cheap. Or a power plug for an existing battery pack, like a cordless drill.

I need a battery, hacked or built, that delivers between 12-15v, for a camcorder that uses 18W then running. The longer the battery delivers the power, the better. Big thing? The battery has to be cheap - I'm putting the kit together on NO money - and easy. My electronics skills are limited to soldering wires on speakers and phone plugs. Did I mention, the battery should be cheap? I mean, really cheap?
Oh, and suggestions can include jury-rigging a plug for a power-tool battery that I can then wire into a cable terminating in a 4-pin XLR power plug.
As long as everything is free or cheap.
Yeah, I know. It ain't easy being a movie maker. Potentially.
Ideas can be sent to

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rickharris6 years ago
Oddly small Lead acid batteries for alarm systems are remarkably cheap. The come in a small belt mountable size as well.
DeesSqueeze (author)  rickharris6 years ago
Thank you very much. Am I correct in thinking that alarm system batteries are not deep discharge? I am not certain why I think this. Perhaps I read it somewhere. I have been told that running a normal battery for several hours without recharging will damage the battery. You mention the size and weight. Can I get the required 18 watts from a small battery? Or would I have to consider series/parallel setups?
I run a former cordless drill from 2 of these batteries with no problem at all - Yes I need to charge them every week or so but that's not any bigger issue than charging the cordless drill was.

I use a standard car battery charger.

As long as you keep the SLED above 10.8 volts 11 volts to be sure you will not damage it.

As for deep discharge I guess not at this small size although they are intended for long term use with low charge levels and little maintenance.

DeesSqueeze (author)  rickharris6 years ago
Thank you very much. I am assembling a SLA battery pack, I have almost all of the components. The manager of the parts store, however, has recommended that I consider the power-tool batteries, as they are lighter and the power supply maintains an operating level above 11.5 V longer. That will come next, I suppose. So both of you are the best answer.
Re-design6 years ago
Use a 12v sla battery, some wire and connect it directly to the battery contacts on the camera. You'll need a sling for the battery and a charger. If you wire it up wrong your camera becomes a pretty paperweight. Put some sort of switch or polarized plug inline with the battery so you can disconnect it from the camera.
DeesSqueeze (author)  Re-design6 years ago

Thank you very much. The SLA battery sounds good. I would have to run wires off the terminals through a fuse and then into an XLR plug to fit the camera. Could I recharge through the XLR plug? If not, how would you suggest that I set up for charging?
The fuse is a great idea that I should have mentioned. You can charge thru the plug you just need a socket to fit on the charger.
DeesSqueeze (author)  Re-design6 years ago
Thank you for your time. I have started putting the materials together. I should be shooting next week.