I recently purchased a Power On Lithium battery and charger and have been thrilled at the lightness and power of it. It has made my MGI buggy so much easier to handle and I find myself zooming along behind it. It is amazingly light and I can carry my handbag, water bottle and battery in the one hand when packing the car. Another great thing about this Power On Lithium Battery is that it charges in next to no time. I was so excited when my old HEAVY battery gave up the ghost and I could finally get this one.