hawg Posted July 12, 2017 Report Share Posted July 12, 2017 I've just had to replace (under warranty) my third Optima Blue Top 34M trolling motor battery in the past 4 months. I'm running a 24 volt MinnKota RT 70. Each time, one (and only one) of the batteries has shorted internally, failed to take a charge, and tested bad at the NAPA dealer with an output voltage of 4 volts. Has anyone else had similar problems with these Optimas? My original Optimas lasted for 8 years. The new ones are lasting about 8 days. Link to comment Share on other sites More sharing options...
James Grissom Posted July 13, 2017 Report Share Posted July 13, 2017 Sorry to hear I have the same 2 batteries for my trolling motor an night lights , they also don't seem to hold a charge for more than a weeks when I first picked up my boat . Removed Optmas an charged them in garage with same 2 bank Guess on board charge . Then removed charger from circuit ,volts indicated 12 to 13 volts , 1 1/2 days later 8 on one and 10 on the other . My starting battery is an Interstate flooded cell , all 3 are about 5 to 6 years old . So I'm go to Deka AMG batteries for all 3 Even though I'am running a 1996 yamaha 130 2 stroke . When your charging them do they feel warm or hot ? And was there any signs that the case has swollen ? Hope some one chimes in to give you some solid advice, Severial have shared there experances and valued thoughts with me . Good luck Link to comment Share on other sites More sharing options...
hawg Posted July 13, 2017 Author Report Share Posted July 13, 2017 James, The cases look fine. When the battery shorts, it burns the fuse on my onboard charger. If I take the battery out and put it on my garage charger it will show nothing on the charging gauge but will overheat the leads in about 30 seconds. Link to comment Share on other sites More sharing options...
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