I have Motobatts in everything, no problems.
They are 1/3 rd the price of an Oddesy in Oz, and test just as good.
But if they get flat 13.5V or a trickle charger wont recharge them - they need 14.4 Volts and a decent shot of power.
Go to the Motobatt site - it has a comparison test on it, and recharge it the same way they recharged the batteries between tests.
I have had two PC 680s, both failed at two years, no warning, in normal use one minute, next start just died under load, still with full resting volts, but SFA under load, and I think this is typical of the newer style batteries.
Adelaide Hills, Australia. 93 R100 GS, 77 R75/7 ,70 BSA B44VS, , 86 R80 G/S PD, 95 BMW Funduro F650 ST