The charger does not have an internal battery. The charger will need to be plugged into an AC outlet to charge. It is needed to be reset each time it is reconnected.
Noco Genius Onboard Battery Charger/Maintainer/Desulfator, 2 Banks, 10 Amps, Model# GEN5X2

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- Rated at 10 Amps for 12 Volt batteries, including marine, boat, starter and deep-cycle batteries
- Integrated thermal sensor detects the ambient temperature and alters the charge to eliminate overcharging in hot climates and undercharging in cold climates
- Charges batteries as low as 1 Volt
- All-new force mode that allows you to take control and manually begin charging dead batteries down to zero volts
- Automatically detects battery sulfation and acid stratification to restore lost battery performance for stronger engine starts and extended battery life
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