I have made a DIY battery box for my SIB using a waterproof junction box.
The box has been fitted to a piece of ply and clips under my bench seat with some stainless clips. The only thing I use it for is a fish finder, which is the single lead coming out of the box currently.
Overall it was a pretty cheap and effective solution. The only issue is that to charge it I have to open the box to clip the charger to the battery. I would like a solution to enable me to charge the battery from the outside.
I thought I might be able to get some terminals with screw on waterproof caps that I could just bolt through the case. I could then connect the crocodile clips from my battery charger to these points. But I cant see anything, certainly not reasonably priced.
Next thought was to fit a surface mounted 12v waterproof cigarette lighter, then make a male 12v adaptor to connect to my battery charger. I'm sure this would work, but would mean buying 2 items - the socket and a male slave to plug in as a charger. The advantage would be I could use the 12v socket to charge my phone or similar on the water.
Final idea was to use a lead like this:
which I believe will connect to the adaptor on my battery charger. but this would be another loose lead from the box, Other than cable ties I cant see a way to neatly fit the lead to the box.
Before I start ordering bits and bobs from ebay which may / may not work, does anyone have any other products they have used to add a charging terminals to a DIY battery box.