Electrical – Charging 2x Li-on 18650 Batteries In Series

battery-chargingseries

I am on a battery powered project where i use 2×18650 batteries connected in series.

I bought this specific module 2S Li-ion Lithium Battery 18650 Charger Protection Board Module

What kind of charger do i use for this?Could i solder usb connections to charge the series through this module with 5v?

I admit i don't really know how this module works.Does it isolate each battery to completely charge it and the move on to the next?

Best Answer

Specs

  • Short circuit protection

  • Overcharge protection

  • Over-discharge protection

  • Overcurrent protection

  • Overcharge Detection Voltage: 4.25-4.35V±0.05V

  • Over Discharge Detection Voltage: 2.3-3.0V±0.05V

  • Maximum Working Current: 3A

  • Transient Current: 5A

  • Operating Temperature: -40-50 degree

  • Internal Resistance: Less than 45m Ω

  • B+ B-: The interface of battery core

  • P+ P-: The connector of battery board

  • MB: The connection point between the batteries

  • B+: Battery V+ Positive

  • B-: Battery V- Negative

  • P+: Output / Charging V+

  • P-: Output / Charging V-

  • Size: Approx. 36x6x1mm/ 1.42" x 0.24" x 0.04"

Engineering Assumptions

  • Vsource min > for 2 cell OVP = 8.8V max.
  • Vsource max > due to Current limit and VI drop thus heat rise from losses

9Vdc 3A seems to be an optimal solution depending on cell ratings.

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