I'm trying to Bild my own boombox with an 2*50W Bluetooth amplifier and 10 18650 cells with 3,4Ah each. I habe bought a tp4056 charging board. The question is if i use 10 betteries connected in parallel and connect the minus and plus to my tp4056 board if it would be able to charge the safely. Or do I need a balance charger?

  • \$\begingroup\$ No need for balancing parallel batteries. \$\endgroup\$ – JimmyB May 17 '17 at 9:42

You theoretically don't need anything, but there are drawbacks:

  • The charging will be 10 times slower compared to a single cell charged from a TP4056

  • A damaged cell will cause the others in the pack to drain and you'll never be able to charge or maintain the pack at full capacity.

  • A damaged cell will also cause even more slower charging.

So if you make sure all cells are good, you should be fine for a while.

  • \$\begingroup\$ Short circuit current can become dangerously (fire) high - fuse each cell with a thin connecting wire / track \$\endgroup\$ – Henry Crun Mar 16 '18 at 22:50
  • \$\begingroup\$ For standard cells, you can use a 3.15A fuse for each cell. That makes sure no accidents happen. A cell can deliver up to 2A safely, so at above 3 means there's a problem and that's where the fuse comes in. adelaida.ro/images/thumbnails/31/120/… \$\endgroup\$ – Overmind Mar 22 '18 at 20:38
  • \$\begingroup\$ is there other charging modules like TP4056 for charging multiple batteries in parallel? \$\endgroup\$ – kit Nov 5 '18 at 5:56
  • \$\begingroup\$ I build myself a 12-slot charger using TP4056s. I can charge 12 cells if the PSU is good quality on the 5V rail. xaeus.wordpress.com/2018/02/14/… \$\endgroup\$ – Overmind Nov 7 '18 at 12:59

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.