Hi, my wife bought me a C5 for my 30th Birthday on the weekend, but the car battery that came with it seems a bit knackered. I'm not sure whether to go for a Leisure battery (priced up a 70Ah for £56 locally), or to get an electric wheelchair or mobility scooter battery. They seem like they might be lighter for a similar capacity, from what little research I have been able to do so far.