Another Battery Question

[gunflint]

I have 2 deep cell batteries. One is one year old the other is 2 years old. They were stored indoors over the winter and charged in January. I also use a 10 amp Minn-Kota portable charger. Both batteries indicate that they are fully charged by the charger yet when hooked up to the trolling motor it indicates "Low". When I put them on the charger the cells bubble for a few minutes the the charger say "Charged". Another clue is that our old charger from last year may have cooked the batteries. Is this a charger issue, a battery issue, or a trolling motor issue? Thanks

[mnfishman]

Do you have a volt meter to see what the actual voltage is at the battery posts as well as what is at the trolling motor plug?

[BobT]

I don't know for sure but I'm thinking the battery charger may indicate a full charge when the voltage potential between the battery terminals reaches a specified level. The batteries may not be able to deliver acceptable current levels when loaded (the battery that is) and my guess is that the trolling motor might be using current as its indicator.

You could have the batteries load tested to make sure they are not the cause.

Bob

[Black_Bay]

I had the same thing happen with a Minnkota charger. I bought a new charger and problem solved. Those little round Minnkota chargers last as long as the warranty then they go south.

[gunflint]

The charger is newer than the batteries.

[PierBridge]

Quote:

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The charger is newer than the batteries.

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Don't feel to Bad I have the same exact charger its 2 weeks old and doing the same thing yours is doing.

Mines going back tonight..

[RobertELee]

I have the same brand charger but 10 years old, it started doing what your describing last summer, replaced it with a new one (different brand) this spring and my trolling motor has never had more power.