First time owner, would like to install 2nd battery in my 2009 21V.

Current plan is to get a surepower 2315 and wire it to 2 blue top optima batteries.

I have a single battery in place from the factory. I'm not sure where the best place to put the second on in - very leery about starting to drill holes into a boat.

The boat already doesn't seem like it has enough space to store stuff - we have a pair of water skis and a slalom ski that only seem to fit in the area where the battery is and if I put another battery in there not sure things will fit. Also not sure whether to mount the surepower unit on the flat wall in the middle, or the little "bracket" that sticks out.


I would really appreciate it if anyone can post where the factory installs the dual batteries or any other installs in a 21V.

Other suggestions also appreciated greatly - I know this is a frequent project but as a first time boat owner it's a little overwhelming and scary.