The GSA has been kept outside since September so not on a trickle charge. The bike stood for a number of weeks unused. Took it out (bike started as usual) and the garmin nav wouldnt come on, just a ‘no power’ icon in red on the screen. I rode 30 miles each way, the nav started working normally on the return journey. I squeezed the bike into the garage and got the ctek on it. After phase 2 the charger threw an error red light. I tried again, same. Next time, went to 3 then red light. Next time, same, then after a few more attempts, finally the charger went all the way through the phases and a green battery light appeared. Took it off, tried again a day later and all good again. I thought I was going to be buying another battery, hopefully not. Impressed with the ctek. Although this post is probably tempting fate 
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