I recently replaced my group 31 lead acid starting/electronics battery with an Impulse 105ah All Purpose lithium battery. I fished a little over six hours Friday running two Lowrance Gen 2 HDS 12's, two HDS Pro 12's, AT 2, two NMEA networks and my turret for the AT 2. The battery still had 70% charge when I put the boat away. BTW, the electronics I mentioned only draw 8.1 amps, all on.