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Old 11-16-2020, 05:21 PM   #1
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Trickle charging 2 batteries

Hello. I removed the 2 Centenial Marine batteries from my trailer and want to trickle them all winter. I have only 1 battery charger. Can I make 1 battery charger trickle 2 batteries or do I have to buy another battery charger? I hope not cause they are pricey.
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Old 11-16-2020, 05:35 PM   #2
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If TWO 12VDC connect them in parallel and charge away (one clamp on POS of one battery and one clamp on NEG of other battery from charger)

If TWO 6VDC hook them up in Series and charge away (one clamp on POS of one battery and one clamp on NEG of other battery from charger)

Course whether they will charge...depends on the Trickle Charger
Hopefully you FULLY Charged them PRIOR to removing from TT
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Old 11-16-2020, 05:56 PM   #3
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Trickle one battery for a week and then the other for the next week. Wait a month and repeat.
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Old 11-16-2020, 08:30 PM   #4
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If it is a 'trickle charger' it never stops charging and can possibly over charge your batteries. Charge batteries until full, then check every few weeks and charge as needed.

If you have a 'battery maintainer' that can do 'float charging' on an as needed basis, then you can leave it plugged in.

Double check your charger's users manual.
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Old 11-17-2020, 08:45 AM   #5
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Try the one you have as suggested above. Get a digital voltmeter from your local hardware store and periodically check the voltage on the battery terminals.

13.2 volts is ideal for storage. 12.7 is the minimum. 13.6 is the maximum. The higher the voltage, the more water the batteries will consume. Monitor water level and voltage until you are confident the system is stable. Down to 12.4 volts, means they need a full 14 hour charge.

If the batteries are sealed, 13.6 volts would be a little high. You can't add more water if they vent. Lost water is lost storage capacity.

I wish you good luck and happy trails ahead!
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Old 11-18-2020, 08:38 AM   #6
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Hey everybody thanks for the input. I called the manufacturer ( they are in Las Vegas Nev) and they said to charge each battery separately which is one of the comments given here. One week for one and one week for the what they said. Thanks.
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Old 11-22-2020, 11:02 PM   #7
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Old 11-23-2020, 01:25 AM   #8
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Originally Posted by twinboat View Post
Trickle one battery for a week and then the other for the next week. Wait a month and repeat.
Took the words out of my mouth!

I have two spare 12 volt batteries and one 6 volt battery in my garage. About every six months I put a trickle charger on them and top them off.

Check your water level too.
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