Recommended for Best Place to Buy Lithium Rechargeable Batteries?

tunzafun001 on 29/10/2024 - 22:22

Looking for some cells that can handle consistent 6 - 12 amp drain (Ebike battery pack).

Ideally 26650's (might need 100 of them).

I've got a heap of cells that are stable at 4.1v for days, and still have decent capacity when powering a light. But as soon as a 5 amp load is applied, they drop like stones.

Best I've seen is some prepacked "e scooter packs" with 39 cells for $90, on Amazon..

But instincts says they will have nowhere near the listed capacity. Will Amazon back you up if you receive a 15Ah pack and it is only really 7Ah? Alternatively, they might lose their "grunt" in a couple of months.

Next is Liitokala cells at $4.90 each per 10 on Ali Express. Feel these would be half decent?

I've been stripping 18650's out of old Stick Vac packs (amazing the batteries from the Anko cope better with loads than the Dyson cells - but could be older). Also found a few hard rubbish power tools. But in general the 18650's don't have the grunt of the 26650's (and I guess this makes sense).

Electrical & Electronics Battery Lithium Battery

Comments

  • brendanm on 29/10/2024 - 23:04

    Get an internal resistance tester. Good batteries are expensive, cheap batteries are not good. Could you make it out of RC lipo packs? Higher probability of combustion, but great current capacity.

    • tunzafun001 on 29/10/2024 - 23:13

      Yeah, I'm looking for an XTAR VC8 plus charger / tester. Internal resistance will be crucial for analysing existing pack.

      I'm not fussed where the cells come from, just the best value.

      • brendanm on 29/10/2024 - 23:14

        The RC packs are pouches and not hard "cells" like you have currently.

        • tunzafun001 on 29/10/2024 - 23:22

          Ah ok.. I don't actually know much about the pouches (other than I have a heap of old MacBook batteries that have pouches). But they wont output 6+amps.

          Don't think there are any ebikes with pouches. Maybe a reason, not sure.

          • brendanm on 29/10/2024 - 23:27

            @tunzafun001: RC car pouches have very high current capability. They need a good bms

    • brendanm on 29/10/2024 - 23:15

      These ones likely use crappy cheap pouch style packs with crappy BMS.

    • tunzafun001 on 29/10/2024 - 23:16

      Meh, it's the future..well it's here now. EVERYTHING has batteries these days.

      I'm 99% sure most of these fire incidents are from either BMU's/ BMS not cutting out (so overcharge cells until they get so hot they burn).
      So don't leave it charging over night. I never leave anything plugged in indefinitely But think of how many people do, vs fire incidents. Summary, there are a lot of people doing the wrong thing, but incidents are still low. So if you do the right thing…

      Second would be damaged cells from rough handling.

Login or Join to leave a comment
Login Join