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A 12-volt battery is not a 12-volt battery. A trickle battery charger will charge a battery at the same rate as the batterys self-discharge which is how quickly a batterys capacity falls during storage. For an effective charge you need to make sure that the panel is.
The damage when the battery goes below 50 is minimal and as long as you never let it go below 30 the battery will still be able to hold a decent amount of charge for a long time.
Internal materials slowly break down. It can take several days to charge a flat battery. It can take as long as 24 hours to get the battery up to an acceptable charge depending on how depleted your battery is when you start charging. Always before charging a battery in using the charger is best to refer to the manual that came with both the battery and the charger.