Dual battery setup

What makes of battery are people using who have two batteries in the box under the passenger seat?

My battery takes up more than half of the space and is smaller than most I have seen.
Or do people modify the box to take the second battery?

X-eng High Performance Off-Road Engineering

Highly recommended.

i use two numax batteries in my seat box..i leveled up the bottom of the bat box first so they both sit next to each other,the only thing i found with the numax bats i have is there was no handles on them so taking them in and out while we were wiring the split charge up was difficult.we overcome this by using very thick cable ties wrapped around the batteries in a cross pattern so you can lift them in and out easier.simple but works

Cheers Guys, that gives me some thing to work with.

I highly recommend one of these too:

National Luna

Currently running the standard batt with one from a VW T4 van on an X-eng splitter. Have used it to winch, run a fridge for 4 weeks around Morocco, run a pair of high power spots, run a T max air compressor along with powering GPS/Computer/Invertor and 12v sockets.

G