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Old     (alcarlaw1)      Join Date: Jun 2007       05-21-2008, 12:16 AM Reply   
Can somebody tell me the good points and bad points of using a dry cell battery as a 2nd battery. I understand you cannot use a standard car battery charger for these - instead a specific dry cell charger is required. I am assuming the dry cell battery would have no adverse affects being charged off the boat alternator when the engine is running?
My plan is to add a 2 battery perko switch and use the dry cell as the "get out of jail battery" if my primary battery goes flat. If I can get away without relays and combiners I would rather do this. Thoughts and comments appreciated. Cheers.
Old     (iagainsti)      Join Date: Apr 2004       05-21-2008, 11:15 AM Reply   
A true dry cell battery has to be charged in a very specific way otherwise you slowly destroy the battery. Just go with a AGM battery they are less finicky and cheaper.
Old     (alcarlaw1)      Join Date: Jun 2007       05-22-2008, 2:13 AM Reply   
I can get the dry cell battery for free hence was hoping I could use this in my boat. Will the dry cell charge from my alternator or would I have to have to hook it up to a mains powered charger when the boat is out the water?
Old     (iagainsti)      Join Date: Apr 2004       05-22-2008, 9:28 AM Reply   
Yes a drycell will charge from your alternator but it might not charge it effiecently and cause premature battery failure. If your getting them for free I guess it wouldnt matter cuz you could just replace it if it fails. If you dont want to destroy the batteries it would not be a bad idea to keep it off the alt and get a good charger that handles drycells to charge it independently.


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