Uploaded June 2024 | Updated September 2026, 1 week ago

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This unit counts coulombs flowing into and out of a battery.
Coulombs are a measure of charge in amp seconds - this device displays charge in amp hours.

juntek.aliexpress.com
aliexpress.com/item/1005006756222128.html

Heltec 4-cell monitor:
aliexpress.com/item/1005005902860920.html