Went on my Quetico trip last week with my new Rigid battery set up and was surprised when the fish finder stopped working when I know it was still reading around 17 volts. So I opened it and pressed the self-test button on the battery and the LED lights flashed suggesting that the battery needed charging, so I tried the second battery the next day and around 17 volts it cuts out, that was after maybe 6-9 hours of run time. :o Big bummer on the Rigid battery setup, was unaware of that battery operating issue? thought it would run long time!
Any suggestion let me know otherwise back to AA's.