I left my motorcycle too long without using it and now it won't start. The last time it happened I brought the bike to a shop, and they were like there is nothing wrong with your bike, it's just out of battery. Here is the bill ($$$) BTW.
This time I'd like to fix the problem by myself. My battery tender (Battery Tender® Junior) won't recharge the battery because it doesn't have enough charge (if it can't pick up at least 3V it won't start the charge, as it's not able to evaluate the state of the battery). Is there an alternative battery charger I can use? Don't want to shop and (try to) return if possible. My local bike shop couldn't recommend a better charger, but they suggested replacing the battery instead. Is this a simple procedure?