C-Tech chargers arnt bad and very easy to yous , theys have got a deal on them at the minit .
http://www.nippynormans.com/CTEK-charger-for-BMW-motorcycles/productinfo/CTK-NIPPY/
Iff you havent got a trickle charger ,but have got a normal like car charger , you can do this to keep your batry werking , take it off the bike charge it up , then take a Damp rag like an old T'shirt , it has got to be damp ,wet it and ring it out , then lay it acrost the terminals , drop it on for obveyes reasons , uther whise it will make you jump :yes .
and just leave it for a munth this will slowley decharge your batry ,then after a munth put it back on charge agayn till charged up ,and do the same thing agayn , this stops Salvacion and the plates from carodeing across to each uther,and keeps the batry werking and in good helth .
this is what batry optimizers do they dont just charge the batry they drane and charge the batry .
Never herd of eney complaints with the C-tech chargers ,but have herd all sorts of things going rong with optimates .
As some one ells sed I persaneley dont yous one all the time , and never over the summer munths , they onley time I yous one is wen the bike will be layd up for moor than two weeks at a time , then I just charge it up then then unplug it again and just let the Imoberlizer drayn it down agayn , befor puting it back on the charger ,this way I get allmost up to 3,1/2 years yous out of a batry compaird to uthers I knoe who have them continyuasley on an optymate and need a new batry evry two years !! .:thumbup