Description

5S 15A Lithium Battery BMS Protection Board

This is a battery management and protection board for a lithium battery pack made from five cells connected in series. Although the source calls it a charger, a BMS protection board is not a standalone charger; use a charger matched to the pack chemistry and configuration.

The source lists protection against overtemperature, short circuit, overcharge, over-discharge and battery-output overcurrent. It gives a maximum charging voltage of 21V and describes 15A maximum operation, with natural cooling at 10A and an added heatsink at 15A. It also states a 30A maximum instantaneous current. Verify these ratings and cooling requirements against the exact board documentation and installation conditions.

Specifications stated by the source

Pack configuration: 5S, five cells in series
Charging voltage: 21V
Overcharge detection: 4.25 ± 0.025V
Overcharge release: 4.15 ± 0.05V
Over-discharge detection: 2.50 ± 0.08V
Over-discharge release: 3.00 ± 0.1V
Overcurrent threshold: 20–30A
Operating current: up to 15A (source-stated); 10A with natural cooling, 15A with a heatsink; instantaneous maximum stated as 30A
Operating temperature: -40 to 85°C

Source specification discrepancy: it lists 18V as 3.6V × 5, which is consistent, but pairs 18.5V with 3.7V × 4 and 21V with 4.2V × 4. A five-cell series pack uses five cells in each calculation. Confirm the intended chemistry and voltage values before use.