Review on ⚡️ MakerFocus 4pcs 18650 Charging Board: Dual USB 5V 2.4A Mobile Power Bank Module with Overcharge/Overdischarge Protection - DIY USB Power Bank Board by Allen Tchida

As expected and it's nice to have a more detailed way of measuring the remaining charge in the batteries e.g. B. the actual percentage. I'm glad I found this on Revain, but unfortunately Revain no longer sells power bank 18650/26650 batteries. You'll have to remove these batteries from your old device to use them in a new way, or get lithium-ion batteries elsewhere. Capacity in the new system so that it is automatically calibrated.