Silvia wrote:I'm definitely looking only at vented ones .
The vents are for gasses though, so corroded floor would indicate a non AGM (i.e.liquid inside) battery was used. Corrosion is to the general area of boot if gasses are responsible, even resulting in potential explosion.
The Federal for example is vented and fits the existing breather pipes in boot.
Silvia,
Whilst I acknowledge the possibility of explosion, gases do condensate, particularly in confined spaces and even in drainage tubes.
Greg.