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Due to working away from home and spending 5-6 weeks away at a time I found that the battery was very weak when new and would not turn the engine without 24 hrs on the optimate charger. My battery had to be changed after 2 1/2 years. (my VFR 750 only lasts 1 1/2 years). I have now started using a solar trickle charger which works very well. No charge controller required and it just fits straight onto the battery. Direct sunlight is not required, just daylight. I will post full details (with photos)in the future. The solar charger is being discounted at Maplins, with a price of only £9.99 a bargin!