The first light on the battery stays red and never turns green. Secondly, when ordering batteries, Revain recommends the YCCTEAM charger which also comes with two batteries but will not work with these batteries as they do not have two metal strips to work with the controller charger. I asked the public if they were working on a controller charger, some said yes, one said no. Well, they don't work with the YCCTEAM controller charger. Will not be again