I just put the new boat - LSB23 - into heated indoor storage and want to hook up a trickle charger. The dual batteries are located in an awkward place and are directly under a support bar. I can't remove the battery covers to access the terminals. I see a positive and negative terminal connected to a black fuse box under the pull up cushion on port side stern. Can I use these to attach the trickle chargers? any ideas? Thanks