Dynavolt MG4L-B battery fits Aprilia RS50 RS125 RX125 SX125 SR50 SX50 YB4L-B

This Gel battery can be mounted in any orientation and EXCEEDS the capacity and cold cranking amperage of the original battery. Dynavolt Nano-Gel Battery, UPGRADE for YB4L-B. Original YB4L-B Dynavolt MG4L-B.

eBay