What's hiding under your BA battery tray?
Just fitted a set of IPF900s 130 watts to the front of my BA, had to remove my battery to do a bit of wiring.
The heat of the out back is bloody hard on the battery to the point that some time the acid overflows or i overfull it causing this.
Used a wire brush then a coat of killrust enamel and finally a coat of flat black engine enamal.
Time for a maintance free battery.
I still miss my EX
but my aim is getting better