My FE battery went flat a while back, it had done an enduro play day so I did a lot of stopping and starting, waiting for mates to catch up, or just stopping to swop bikes. Then wheeled it about to wash, a bit of maintenance and on / off workbench.
Came to start it and found it a bit flat, not sure how much power it uss each time it "come on" when wheeled about, assumed it was just LCD that used next to no power, but perhaps it powers up ECU and draws fair bit?
Could of just been the stop / start on the play day, been fine of trail ride since then.
I just banged my "normal" optimate on it for about an hour as I had nothing else, but never leave it connected to our other bikes, I just pop it on them for about an hour once a month through winter.