I use this to replace the 4.5 volt battery in a solar powered fence charger. It took a little adaptation soldering new wiring from the charger to the battery and worked great. My experience with using solar panels that recharge batteries it's best to make connections with solder and use water proof automoblie connection with a little diaelectric grease. As long as the panel put out at least 1.5 volts more than the battery rating usually works fine. Normally the only diiferences in a 4.5 or 6 volt solar powered fence chargers is the size of the panel.