Bought a used Victa Enviromower. 2 x 12V batteries work well for around 30 minutes (more than enough than I need).

Want to prolong life of batteries if possible. The Victa charger is just than. Doesn't appear to regulate and turn off when battery is full. Have read this kills batteries.

Would also like to run batteries through a reconditioning process, perhaps could squeeze out a bit more performance (motor starts running slowler at 30% of capacity).

Any recommendations.