ok then acid and gel battery I can exclude them totally.
I will look too find lithium or something else ?.
I would like to put some pictures in this topic , but I don't know how to do it
?
I have same bike projects so so not totaly finished , could I show you the material what I found for this project will be an aluminium frame with steal for ranforsment .
i really hope that someone understads what I am writing
thanks for your help