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Hi Rod , you are better off keeping the battery on a constant charge, by allowing them to discharge when not being used , the battery life is shortened.
I install fire alarms for a living, these are huge units the type used in highrise apartments and office buildings,
The backup power is 12v gellcell batteries, these are on a constant charge via 240v mains chargers, they last on average 5yrs before they require replacement, A lot of Emergency and exit lights use 6v batteries also on constant charge,these are good for at least 5yr sometimes 10yrs depending on the brand.
The only problem with gellcell type batteries is they do not like being charged constantly with a auto car charger ( they tend to get too hot and split open) hench the reason I suggested using solar chargers.
hope this helps
David.
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