thats quite a slow charger im affraid mate e.g if the charger charges at 1000ma(1a) then a 3500mah battery will take 3 & 1/2 hours to charge fully,so if you charged it at 3.5a (3500ma) it will take 1 hour to charge,as your charger is only 300ma by my calculations your battery will take about 11 & 1/2 hours to charge.i think you need to get a better charger,one thats has got at least a 1amp charge rate.
Hope this helps dave
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