Here’s a nasty thing:
This battery blew at 5:00am and apparently was reminiscent of a small earthquake. The quick fix has been to remove the battery and it’s neighbour leaving a domestic bank of four.
A few more pictures. It must have been quite a bang:
As the side burst, the acid from five of the cells had drained out into the battery box. Good job it was well sealed
This is the acid, which is pretty grey from lead sulphate
Anyway, lots of careful cleaning up with alkaline solutions (Bicarbonate of soda in water), rubber gloves, old clothes and the boat is now OK