Instead of using a $25 Li-Poly battery with a $10 charger, I was going to use one of these- https://hackaday.io/project/46436-3-cell-rc-battery-pack-made-with-18650-batteries What I was wondering Is how it would compare? It seems safer than a Li-Po, and cheaper, seeing how I have a bunch of those batteries sitting around, but performance wise, I'm clueless.

  • \$\begingroup\$ The Tesla model S uses them so I don't see why you shouldn't. \$\endgroup\$ – Finbarr Feb 5 '18 at 18:20
  • \$\begingroup\$ Because they're not the right kind of batteries. \$\endgroup\$ – Bryan Boettcher Feb 5 '18 at 19:27

There's a few things wrong here:

1) A $10 charger is a bad idea, unless it's a trickle charger through the balance leads.

2) A $25 prismatic high-C lipo is a very different beast than 18650s, barring very specific ones (the LG HG2, Sony VTC5, etc) and very specific flight modes (minimum time-in-the-air of 30 minutes or longer). Most 18650s are sub-1C discharge ratings.

3) You need to spot-weld the tabs to the batteries. Do not solder them.

You also didn't say what kind of 18650s you already have.

  • \$\begingroup\$ sorry, i have these ultra fire ones... shopnis.ru/akkumulator-18650 and I was going to rig them without welding, maybe make a really small holder for them, them I can pop them out and put them in my power bank and charge them from there \$\endgroup\$ – J. Doe Feb 6 '18 at 1:11
  • \$\begingroup\$ i mean, in a 3s2p configuration, it would be fine, right? check this out- rcgroups.com/forums/… \$\endgroup\$ – J. Doe Feb 6 '18 at 1:30
  • \$\begingroup\$ I can't stop you from doing it. It's going to end in fire. Those cells will live up to their name in this usage. \$\endgroup\$ – Bryan Boettcher Feb 6 '18 at 15:25

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.