Thread: Anyone ever have this battery problem?

I cannot tell you if it will be any good or not kinda depends on several things....how much water did you add ? The water is on top of the acid...it is sacrifical ...purpose is to keep from losing acid to evaporation. when the water is all gone you lose acid then and if you lose much acid then when you fill back up with water....your battery is still weaker because of acid loss. You really need one battery for cranking, and your electronics, and everything in your boat except your TM...You need two dedicated group 31 batterys same brand same age for your 24 volt Terrova only. what you doing now is useing one of your TM batterys to run your 12 volt stuff and then pulling that one down even more when running your TM. So...one battery was being over worked....takes it longer to charge than the other one...so between chargeing harder and the hot weather...you had more water loss in that one.

If you put this on the mechanics board , there is a guy , I can't remember his name. But, he's a battery guy . He will likely give you some very sound advice. Only thing I know is used distilled water in batteries . This is 1 of the reasons I've gone to sealed AGM batteries. No maintenance.

What G says makes lots of sense!!


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Had the same exact problem a couple months ago with one of two trolling motor batteries, same group, same age, same charger 2 bank MK. I tried numerous times to refill the battery, even individually charged it to no avail. Turns out it was bad battery plain and simple. Other is still holding charge and used as the cranking battery now. Put same size and group as well as age batteries in the trolling motor 24v lineup. Also switched to a Noco Genius smart charger. Funny how you can get a bad battery every now and then that I'd same brand, size and manufactured on the same date. Also, I agree with G, you need a separate cranking battery and a designated 24v system for your TM three batteries total.

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Thanks, G. The plates were barely showing, so not much water loss. Gonna add water and try them again. This is my Wareagle boat, and in no way will 3 batteries fit. Barely enough for 2 and the gas tank. The 1648 is really tight. I have been using only 2 batteries for a couple of years. Always could pull cranks for more than 8 hours, and still plenty of juice for crankng. Something went haywire lately, lol.

Originally Posted by Dutchman

If you put this on the mechanics board , there is a guy , I can't remember his name. But, he's a battery guy . He will likely give you some very sound advice. Only thing I know is used distilled water in batteries . This is 1 of the reasons I've gone to sealed AGM batteries. No maintenance.

that would be ; CatFan and he knows is stuff for sure !!! but what G said has a lot truth to it too !!!

If you MUST use one of the batteries as a cranking battery, I'd rotate which one started the outboard every month or so to try and keep both batteries even...

On a side note, I just lost the water in one of my batteries. The other one was low too, but not nearly as low as the one was. MK 3 bank charger. I went out one day and fished in the tailrace for hours. Came home, charged the batteries overnight like normal. Went back the next day and had a dead battery within an hour. Checked the water and it was very low. Both were 5 month old batteries. I got them replaced.

Abe, that battery probably has a shorted cell. Fill it with water and hook up charger. That shorted cell tells charger to keep charging and it starts to over heat battery. That added heat cause the acid and water to start bubbling and it will evaporate pretty rapidly. Need to at least replace that one battery and like others I would recommend replacing both and using the one good one for cranking and electronics.