Volts and Amps are two different things. You could have a battery charged and on an amp meter readin 12+ volts, but as soon as you put any AMPs on the battery it kills it.
An example is I can get the key pad on, but when I hit the botton and the gauges start coming up the whole boat shuts down.
12 210 Team (BoatMate trailer)
List of Boats Owned
2006 196 Limited (Loadrite)
2008 210 Team (BoatMate trailer)
1992 Flightcraft - 1/2 owner - Sold to other half because moved
2007 Air 216 Team Edition (Ramlin Trailer)
2004 SV211 Limited (loaded like a team) (Ramlin Trailer)
2000 Sport Nautique (Ramlin Trailer)
1999 Ski Nautique (Ramlin Trailer)
1986 Wellcraft Elite
1981 Ski Nautique (Ramlin Trailer)