WHEN YOU BUY YOUR BATTERIES MAKE SURE YOU BUY THE ONES WITH THE STRIP ON THE SIDE THAT SHOWS HOW MUCH CHARGE IS LEFT. WHEN THE BATTERY IS DRAINED TAKE IT OUT TO YOUR CAR, LIFT THE HOOD DICONNECT THE BATTERY AND ZAP ALL YOUR DRAINED BATTERIES BY PLACING THEM ON THE POSITIVE SIDE OF YOUR CAR BATTERY METAL TO METAL. UNFORTUNATELY I FORGOT WHAT END OF THE BATTERY TO TOUCH ON YOUR CAR BATTERY. OH WELL IT WILL BE FUN FOR YOU TO FIND OUT THE HARD WAY. I LEARNED THIS FROM AN ARKANSAS FRIEND WHO WAS AN EXPERT AT LIVING AWAY FROM CIVILIZATION