I got an optimate 4 from sportsbikeshop last year.
after the first lockdown my bike was dead.
i left the battery on charge a week and i wasnt impressed with the optimate at all, and im stil not
too many lights on it to understand properly, Only lights needed are DEAD, CHARGING, FULLY CHARGED, FAULT.
it never charges the battery to full.... its gets stuck at 75% and stops charging, i take the bike out and razz around all day, come home to a full battery.
leave the bike plugged in and maybe dont ride for a week or 2 (lockdown crap) and its back to 75%??
personally ive got this and i will keep it now, but if i was buying one right now i would try something else.
not really an issue now as ive started using the bike to commute instead of the car, the bike is better for it... and so is my rusty riding!!
i find im aching after short rides, so need to start riding more.... but thats another story.