Makita use lithium ion batteries they have a high mah so should last a while and u don't have to run them flat before u can charge them up again as they have no cell memory good choice man
If your gunna b using it a lot mate then go for a good brand such as makita boch dewalt snap on things like that 1/2" drive 18-24v look on eBay mate there's usually some good cheap ones goin
There's one on the engine on the left hand side and there two on the gearbox one at the back of the gearbox and one on the right of the gear box that fixes to the right leg of the chassis
I agree with iddy on that one braced or not it will crack the shitty welds can't take the heat For very long run it at a bar or over and it will Laff at u and think pffft iev had inuf of this and do one lol