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Just as the title says. Has someone done this before? Are there ay links you might know of?
Can I direct drive an sst90 with 4x 14500 cells?
- Thread starter pinkpanda3310
- Start date
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Epsilon
Enlightened
In series: definatly no. The voltage is way to high (3.7 * 4) which will instantly fry the sst90. Parallel is possible. If you want to use series, you can use regular NiMH rechargeables.
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hellokitty[hk]
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I think series eneloops is a better solution as they've been shown to hold up well up in the 10A discharge range.
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Yeh, I forgot to mention that bit. Definitely in parrallel. I'm just not too familiar with these kind of batteries. I get the impression 4x nimh won't have much current. Will the current from 4x 14500 be too much for the led? Would I be better off running a single 26650 or 32650? I hope I explained myself better this time.
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You snuck in before me kitty. Eneloops can hold that kind of current hey? That might be a good way to go, thanks.
hellokitty[hk]
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Why do you think that? Eneloops IMO would do a better job and have been shown to hold about 1v at 10A draw which should be plenty tto power an SST-90 with some parasitic resistance.
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4x 1.5v = 6v So with some resistance 6v won't kill the led? Roughly how long a runtime might I expect from eneloops? I don't mean to put them down, I'm just asking the question(s) because I'm a noob
Epsilon
Enlightened
Eneloops and all NiMH cells are 1.2v. Loaded with 10A, they sag to around 1v each, which is ideal for an stt90.4x 1.5v = 6v So with some resistance 6v won't kill the led? Roughly how long a runtime might I expect from eneloops? I don't mean to put them down, I'm just asking the question(s) because I'm a noob
Runtime is very short at those currents though. Even if an eneloop could use 2000mAh at those current levels, this would mean a runtime of 12minutes. But in reality, you will a minutes or so of the full 10A, then it will drop and keep around 5A for a few minutes before dropping even further.
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As I understand 1.2v is nominal voltage. At full charge they are 1.5v. Just like li-ion is 3.6v nominal and 4.1v at full charge. Lipo is 3.7v and 4.2v at full charge. I was hoping 4x 14500 being li-ion might hold higher current for a little longer than nimh but if they are much of a muchness there doesn't seem much point in going with li-ion.
