Just been offerd a e life fold up bike 36v it's around 4 years old in not bad condition the battery was showing full but he said it hadn't been charged in a while I took it down the road a short distance and it seemed to pull well in low mode I went through the modes and it went well he is asking £200.00 for the bike would I be wise to buy it and is there a chance I could find a new battery for it if it died. Thanks Rob