I trail the sib.
Only lasted one year before I built a trailer for it.
Batteries are stowed and secured in the bow box out if sight and take up very little room one they ard strapped in.
They actually help planing by adding bow ballast.
In relation to the weight of other supplies that normally accompany my overnight jaunts my 2 x 7 ah and 1 x 20 ah battery don't weight that much.
Less than a slab of beer lol!
I'm probably only going to keep my Sib another year or two before upgrading it to something bigger .
Battery pack might be a short term solution as I will require a larger outboard for my Sibs replacement.
Will definitely be getting an outboard with charging capabilities as standard next time around