Yuasa Yu-Power Sealed Lead Acid YPC33-12, 12v 33Ah Electric Golf Trolley Battery Fits Powakaddy Golf Caddies wheelchairs, and Electric Vehicles. It will work on almost any electric golf trolley, including Powakaddy, Motocaddy, Fraser and any other electric golf trolley that uses a 12 volt system, providing your battery tray is big enough to accomodate this battery:L(mm) W(mm) H(mm) 196 130 172.
eBay