Powersonic 12V 18AH 51913 BMW R1100RS, R1100RT AGM SLA Motorcycle Battery Original Power Sonic PS-12180NB 12V 18AH SLA Battery. Dimensions: (L) 7.13 x (W) 3.00 x (H) 6.59. Weight: 12.60 lbs. SLA/AGM maintenance free, spill proof battery Rechargeable battery that can be mounted in any position, resists shocks and vibration 1 Year Warranty