Oscar, I am curious what is the type of your boat and how close of the DC exploding from your boat and how many of them to make your battery only has 2%-6% damged? My experience is that 1 DC is closer than 30meters can make your battery level drops to 75%, normaly have 70% health of each battery and 60%-80% health of each elec-engine. 3 DC like this can make your battey level close to 0% and less 20% health of each battery with 100% damage of both elec-engines.