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Building Battery Packs? Answered

Hello all! I am currently in the process of designing an (increasingly) large project using LED light strips. These are the strips I intend on using. Expensive? Yes. Worth it? It should be. The other thing is that this is a portable project, one that I want to be able to use without being tethered to an outlet.

Basically, what it comes down to is that the project involves using about 8.25 meters of light strip. I say about because I haven't done precise measurements, but I'm buying ten meters which should be plenty. This adds up to 264 LEDs total (for the 8.25, not the 10). Each LED can draw up to 60 mA at full brightness, so all of them at full brightness would draw almost 16 A >_<

I am thinking that the best way to go about this would be to build four smaller battery packs, each powering about 2 meters of strip. I was looking at using these Li-Ion cells. The only problem is that I do not know how to accomplish what I am trying to do. I am still befuddled by the relationship between a battery's "C" rating and its mAh, and I am quite unsure of what kind of circuit these batteries need to be used with to prevent killing them, or worse, fires.

What I really want is to be able to run the entire thing for 3-4 hours on a single charge of all four of the battery packs. But I also want to have the possibility to run all the LEDs at full brightness (albeit for a fraction of a second) without damaging the circuitry. Another problem I am encountering is that these batteries are 3.7V, and the strip needs about (but no more than) 5V to run.

I appreciate any advice, help, references, etc. you can give me. I don't need a full blueprint or schematic of how exactly to do this, but I do not even know in which direction to start looking. Thanks again.

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steveastrouk
steveastrouk

8 years ago

So, a single 16 Ah battery would power the string for 1 hour. 4, 4 Ah batteries would power it for one hour.

3 hours needs 3 x 4 = 12Ah x 4 batteries.

The best source for this much power is probably a 6 V SLA battery, which can readily have the requisite 48Ah you need OR better still, a 12V, 24Ah battery and a 12-5 v switching regulator.