I agree with Ray1, the car battery or 80 - 85 Ah leisure battery work fine( The leisure battery weighs about 19 kg, which is a lot of weight to lug around), but go for the C5 Alive safety kit, otherwise you'll be needing to repair the Pod, and the control box if you get the polarity wrong, and your C5 Motor won't run! (Chas sometimes makes them too - PM him)
There are a few brave souls out there who have fitted Lithium bateries in the original battery case, then you can keep the original look. Me I went for Lithium batteries, very expensive, but a 40 Ah lithium set up weighs less than 6kg, and has the same range capabilities as the 80 Ah leisure battery, and in theory should last longer. The lithium batteries don't fade the way lead acids ones do when running, so I've found performance is more consistant. A 10 mile run recently was showning no sign of slowing down, where my speed would have been dropping off on the Lead Acid one.
I use two of these connected in Parallel, came with a charger.
If cost is an issue get a used 063 battery from a Scrap yard and have some fun it'll fit fine and give you 8 - 10 miles of C5 grin.
posted on: 12/01/2015 14:37:25