The algorithm of the indicator of the category of Dive Electronics L-3500

Full power - all LEDs are continuously lit. Eco mode - all LEDs flash at the same time. As the discharge decreases, the number of LEDs included in the indicator.

When there is only 2 LEDs - red and yellow, you must charge the battery. If You have not done so, the light force switches into power-saving mode, it will flash the 2 lower LEDs:

If You then are unable to get to charge, the light will switch into emergency mode "hard" energy savings while still flashing 1 red led, and the brightness will gradually decline:

Akkumulyatorniy to charge battery no need to open the canister. Charging is done using wet contacts. That eliminates the possibility of leakage at the connection.