Denyo DCA-150LSKE, Instruction Manual

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(5) The hour meter has an internal battery
The engine monitor incorporates both a rechargeable internal battery as well as a
charging circuit.
While the generator is not in operation, the engine monitor will still indicate the
hours operated via its internal battery. While the generator is in operation, the internal
battery recharges.
When the generator remains unused for a long period of time, the battery will
continue to lose its charge. Once the charge is exhausted, the hour meter will not
indicate hours, and the battery will need to be recharged. From a completely
exhausted state, recharging the battery for 30 minutes will only result in a 30
minute charge to the battery. However, if charged for 3 hours, the hour meter will in
dicate hours for more than 10 days without another charge.
Please refer to the table below to see the relationship between battery time
charging versus length of indication by the hour meter.