Both batteries charge when inserted and both controllers are working but im not sure how long the batteries will last as they are an older model

Keep your Wii controllers fully charged with the Powerwave Wii Charger. This seller refurbished charger comes with two ports, allowing you to charge two controllers at once using the included charging cable.

Made of durable plastic with a plain finish, this grip-style charger is designed specifically for Nintendo Wii controllers. With a cable length of Wii power cord, it is easy to set up and can be placed on a desktop or desk. The fast charging feature  hands on the Powerwave Wii Charger and keep your gaming sessions uninterrupted.