"Storage Mode" is a feature that comes with every Lester Electrical golf cart battery charger that we sell. When you plug in your charger to your cart it will fully charge the batteries.  Once fully charged, the charger goes into its "storage mode" feature so long as it is connected to the golf cart and the wall. When in storage mode, it will charge your batteries only when the following two situations occur (1) the battery voltage drops to a certain predefined voltage AND (2) 10-15 days have elapsed. Once these two criteria are met, the charger will do a refresh charge to bring up the volts again to 100% fully charged. So, unlike a trickle charger that charges non-stop, the Lester charger charges only when the batteries need a good charge.

Again, this is how all Lester automatic battery chargers work. You can leave the charger plugged in even when you're gone for long periods of time (months), and your batteries will not die because they'll get a charge from time to time to keep the volts up. If you are leaving for an extended period of time it is recommended that you plug your charger into a surge suppressor with at least 2,400 joules