Allot of people use the Battery Tender and although good I would not leave them attached to a battery for along time. Yet there doesn't seem to be to many options out there but I finally found one that you can leave on the bike and just plug it in. The advantage to this is it completely shuts off and has pulse technology that is what batteries really need to keep in shape. The only problem is I haven't used it has anyone else used this? The Signal minder cz10
chargeX uses a technique known as Pulse Width Modulation (PWM) to charge a battery. If the battery voltage is low, more power is supplied to the battery. As the voltage increases to the fully charged condition, the amount of power supplied to the battery decreases and
turns off completely when the battery is fully charged.https://www.kisantech.com/view_product.php?product=CX-10