Different Battery Sizes

rcb123

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Just wondering if anyone has used battery sizes other than 18650s (or lipos) in their portables. I was thinking of using 4 21700s (LG) in series for my pack to get 14.8 V 5000 mAh. Now, while my current pack is by no means good or power dense (2000 mAh/cell, 16 cells series), using these batteries would be about 60% capacity for a little over a quarter of the size. This seems much more power dense than even a 3500 mAh 18650s. Why aren't more people using these in their portables, is it a size issue?
 

Stitches

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Size, weight, and cost mainly. A few people have used 21700 cells in portables before, if you get decent cells they work pretty well, but they're a bit fat. I'm going to assume the cells you're referring to are LG M50s, they're pretty good. Just make sure you use them with a BMS with cell balancing so you keep the full life of the pack.
 
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