Battery boxes - are they necessary?

[Graham_Wright]

I think you will find that polyester is fine with sulphuric acid at normal battery acid concentration.
Perhaps not if any spills or splashes are allowed to concentrate.

I use a battery clamping device obtained from a car parts shop. Halfords did have them but I cannot find them on the website now

They go rusty in cars - what would happen in boats?! (Vide piccy).

 

[Graham_Wright]

Tray it is then (deep).

If it is to be polythene, then a 20/25 litre container suitably hacked about would be a good tight wad solution?

Vic?

 

[rogerthebodger]

They go rusty in cars - what would happen in boats?! (Vide piccy).

I made one like Vic showed from stainless for my engine start battery. My domestic are held down with frames like below. Each one holds 3 105 Ah batteries.

These were galvanized before fitting. I also fitted a rubber pad below the batteries to reduce corrosion.

 

[noelex]

If you have a strong battery box stainless steel right angle brackets screwed or bolted to the side of the box can make for an effective battery securing mechanism.