Hi I live in Hampshire and have been mountain biking around the Woolmer forest area most of my life on a Fusion mountain bike I bought about 25 years ago, the bike is still going strong. I have been talking about with a friend for years about electric bikes and just bought on on eBay just yo have a play. The E bike I bought is an old Eco bike which I believe was used by some police forces up and down the country. It is a 36 volt powered bike that holds 3 12volt 12 amp batteries, although hardly used it does have slight rust on the chrome that's not an issue. Being lead acid sealed batteries they have now come to the end of their life, batteries show 12 volts but have lost its amps the 3 dial light just comes on at two and dies of to one. As for battery replacement I would like to go lithium as 3 12volt 12amp batteries are a huge lump. I thought I could buy three 12 volt equivalents in lithium as a direct replacement with the same terminals but not so. In the mean time I will buy the same old style batteries and will save for lithium until I can come up with a solution. Couple of questions. Can I get one for one 12volt 12amp batteries from lead to lithium, lithium being more efficient would I need less amps say from 12 to 10 or 8. Would I need to charge the bike differently and get a new charger for lithium. Anyone seen or had a Eco bike with full suspension, just wondered what you thought of them even though they are over 10 or 15 years old.