I use 18650 cells (salvaged from an old laptop PC battery pack) for two high-power LED torches I have. Chargers are available from Amazon to charge two of the cells in parallel. Unfortunately they are difficult to charge in series (unlike lead-acid batteries) without sophisticated charge-equalisation circuitry.
Tesla use this size of cell in huge battery packs in their electric vehicles!
18650 cells are usually up to about 3.7 amp-hours, so I certainly wouldn't trust the 6 A-hr specs you've seen.
On 06/02/2018 12:56, oak oak_box@yahoo.com [electricboats] wrote:
I saw AA Energizer Lithium batteries at the grocery store, and was thinking about the past a year (or two or three?) ago where someone said they were going to put together a bank from a whole bunch of small cells.
It seemed odd that they had plenty of lithium AA batteries, but no chargers. Looking the internet, it kinda' seems like these aren't meant to be recharged - just used as a higher capacity disposable?? Is that really true?
Then, I came across #18650 batteries. Just looking at the internet, they appeared to be very close to the AA battery form factor, but on closer inspection, longer and thicker - but also higher capacity? And higher voltage - these were rated as 3.7V cells, not 1.5 like AA's.
Many of the 18650 batteries were about 3000mAh, but some by Garberiel, seemed reasonably priced (on Amazon), and claimed to be 6000mAh. I haven't done the math yet, but it looked like it would be a cheap way to get a 48V bank quickly, and then as I wanted to put more $$ into it and as the experiments went forward, I could always add more capacity in parallel (which at that point would probably be more expensive than just buying higher capacity cells to begin with).
Anyway, I was curious if anyone has played with these cells? Is the 6000mAh rating likely to be real?
Sounds like it would take about 221 of these to make a 48V, 100Ah battery - is that right?13 x 3.7=48V 17x6Ah>100Ah, so 221 cells to make up the bank... @ about $15/10, about $330 for the bank??? That sounds way too good to be true. Of course, there would need to be monitors and battery boxes, etc... But does this math sound at all close???
John
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Posted by: Chris Morriss <chris.morriss@ouroboros.myzen.co.uk>
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