DEFINITELY have a fuse or circuit breaker right at the battery. Make sure the battery terminals are well protected too. If you're using a PS-1270 size battery the Walter Dittel battery box does both those things and makes fitting the battery for flight quick easy and secure. If only they used a connector more solid and suitable for heavier gauge wire than those goofy DIN plugs.

My ASW-15 has the battery installed in the control compartment and the only protection was a fuse on the panel. I changed that pretty soon after buying it. I also just installed a K2 battery in the Dittel box because I upgraded the vario/computer and installed PowerFLARM - figured I would need more capacity. The club gliders where I fly all have a plastic enclosure epoxied to the top of the battery covering the terminals and wires. There's either a fuse or breaker on the box and a 3 pin XLR chassis jack matched by a 3 pin XLR plug on the glider wiring and the chargers. Seemed kind of odd to me as XLR connectors aren't made for power delivery (well, except for phantom power) but the setup seems to be effective and foolproof. The XLR's are a hell of a lot more rugged than the DIN connectors our DG-505 has.