Tecmate presents the O-123 discharge warning device:
It allows you to check the voltage of your battery
Connect using the O-1 connector (optional).
When the device lights up (flashes), the voltage has dropped below the test level and the battery has less than 50% charge remaining.
Recharge is required!
Pre-check: the device will confirm that the connection is correct and will indicate if the battery is charged by flashing 2-3 times. Disconnect if the voltage is above the test level.
The O-123 flashes when the voltage drops below 12.35 V.
SAE connector.