I have been using both of these on my boat for over 6 months. I have 3 Interstate batteries, 2 for my 24V TM and 1 for main motor and electronics. Haven't had a bit of trouble until last time out and then had "Low Voltage" alarms on both units with the 10 finally fading out. When I got home and hooked the up charger the battery showed nearly fully charged. Any ideas? Strange everything was fine for several months and then bad. All three batteries were new when I installed them & the 2 Helix units back in June.