I have used in my scooters for about 2 months now and they seem the work great. I put them on battery conditioners right when I got them and know continue to do so every month or so. I put a couple 100 hours on them I don't think there's any loss of power. So far everything seems good even in this hot Florida weather. They fit perfect in a razor at Eco metro scooter. If you need replacement batteries get these immediately. Just remember you will have to buy some type of connector for the battery terminals. I just use brass crimp connectors and they work perfectly.