I just bought some balancing boards for a Bluetooth speaker project and realized after the fact there are two different equilibrium current options. I bought both the 2S and 3S versions as I haven't settled on how much voltage I want to supply to the speaker amp yet.

Needless to say I bought the 300mA version and my pack is only around 3000mA. Two questions, first is "what is equilibrium current"? Second, can I use this board with my project or do I need to get the 100mA version?

Equilibrium current: 100mA, suitable for 2000-4000mAh battery pack

Equilibrium current: 300mA, suitable for 8000-12000mAh battery pack

2S 3S 4S Li-ion Lithium Battery 2 3 4 Cell Charger Balance Circuit Board 100mA 300mA 4.2v Battery BMS Charging Balanced balncing

Thank you, Martin

  • \$\begingroup\$ Your link takes you to a sign in page for ali express. That's the first problem. The 2nd problem is that decent pdf data sheets are required and not some reputation-challenged selling site that probably won't have a data sheet and sell stuff that is sourced from non-reputable manufacturers. \$\endgroup\$
    – Andy aka
    Commented Apr 11, 2020 at 13:45
  • \$\begingroup\$ The link has been updated. \$\endgroup\$
    – Hartman9
    Commented Apr 11, 2020 at 14:42
  • \$\begingroup\$ The 2nd problem is that decent pdf data sheets are required \$\endgroup\$
    – Andy aka
    Commented Apr 11, 2020 at 15:00

1 Answer 1


In this case, equilibrium current is balance current. This is the amount of current that will be bled from a cell that is over the balance point. In order to reach balance in a reasonable amount of time, larger packs need to be balanced at higher current levels.

  • \$\begingroup\$ Ok so it seems I should have gone with the 100mA version than? \$\endgroup\$
    – Hartman9
    Commented Apr 12, 2020 at 2:41
  • 1
    \$\begingroup\$ Either will work just fine for you battery. \$\endgroup\$ Commented Apr 12, 2020 at 5:14

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