My current Gill 35s is at 12.9 V when I disconnect from the charger. About 5 minutes after I shut the engine off my red voltage light comes on and the voltmeter shows 11.9 V. It stays at that level and even slightly increases and than very slowly drops. After 1 hour it is still at 11.6 or above. So I tested it by switching every available consumer on, stroblights etc and left the master in power mode. It took over 2 hours to drop below 10.5 V. I than started the engine with the starter, I was still flying, and it started, a little slower than normal, but it started. This tells me that it is still ok if the voltage drops that low.
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