4S Lithium Battery Capacity Indicator provide a quick visual reference of the charge status (capacity) of 18650 Lithium-ion batteries, as well as other lithium batteries with a maximum voltage of 4.2 volts per cell.4S Lithium Battery Capacity Indicator is perfect for DIY power supplies, battery chargers, RC and electric vehicles, to provide quick and easy-to-read voltage status of the battery.4S Lithium Battery Capacity Indicator color is red, and the display bars are blue.

Dimensions of 4S Lithium Battery Capacity Indicator 

Indicator Display Range:

• 4S Lithium Battery Capacity Indicator Module: 13.2V - 16.8V

Battery status display:

1. When the battery voltage is over N * 3.3V, it will illuminate 1 bar (N represents the number of battery cells, e.g. 1, 2, 3 or 4).
2. When the battery voltage is over N * 3.5V, it will illuminate 2 bars
3. When the battery voltage is over N * 3.7V, it will illuminate 3 bars.
4. When the battery voltage is over N * 3.9V, it will illuminate 4 bars. 
5. When the battery voltage is less than N * 3.3V, none of the bars will illuminate, indicating that the battery is less than 3.3V and in need of recharging.

Features of 1S Lithium Battery Capacity Indicator:

Package Includes:

• 1 x 4S Lithium Battery Capacity Indicator Voltmeter Module