I am making a Battery Backup system for a project I'm working on, and the batteries will be trickle charged using 1/40th the current. They will be connected to the trickle charger permanently unless power goes out, which is extremely rare, happens maybe like once every 3 months.
Will the batteries get damaged over time from this? If so, how long do u think they will last before they have to be replaced?
Will the batteries get damaged over time from this? If so, how long do u think they will last before they have to be replaced?
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Yes. NiMH cells are not tolerant of trickle charging. I couldn't predict cell life, but you'd be better off using lead acid. Nothing you use as a battery in a UPS should be trickle charged. Batts should be charged according to a profile and then floated. Float is a constant voltage "charge" that delivers way less than 1/40 C current.
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One good place to look up the characteristics of various battery technologies is, amazingly enough, wikipedia.
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This site says you should not apply a continuous charge, even if it is small. http://batteryuniversity.com/learn/artic…
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if you overcharge it will kill the battery