Battery Vents, Required If They Are In The Engine Bay? Or Only In Boot?

[Rolls]

I have a question about battery vents, I realise that proper sealed ones do not require them but the cheaper type do. Now is this only if they are located in the boot in a box? Or is it if they are located in the engine bay as well? If so, where must the breather hose be attached to, just venting to atmosphere?

[Victory]

From personal experience be wary of batteries that are sealed but have vents.

If they have vents run a hose from the vents down to a point below your car so the acid will not spray on your car and stuff it up.

I had one installed in the engine bay without the hose and it sprayed acid everywhere when you start to throw the car around a bit. The problem then is that because the battery was sealed I could not put any water back into it to top it up and had to throw it away because it was low on acid and stuffed.

I now only use fully sealed batteries on the boot or if it is in the engine bay one with caps so you can top it up.