Battery dead after accidentally leaving overhead lamp on

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Battery dead after accidentally leaving overhead lamp on

Post by linzhiming » Tue May 07, 2019 7:14 am

I just went through the joy of being confronted with a dead battery after accidentally turning one of the overhead lamps on and leaving it on for 2 weeks. Running the engine for 25 minutes and separately charging the battery didn't help. Had to order a new replacement battery (Concorde).

I know a similar incident and the logic (or lack thereof) of having the lamp not connected to the battery master has been covered in the forum before so focus is rather on the two following questions:

- Would leaving the lamp on for 2 weeks really irreversibly damage the battery? Or is the contributing factor the fact that the battery had been 4 years old prior to this happening?
- Given that I never really use it even during night flights, does disconnecting the lamps affect airworthiness in any way (presumably not) as long as I have a spare light source with me for night flights?

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