Mighty Max Battery Y50-N18L-A3 Snowmobile Battery for Polaris Indy Indy Trail 1991 Brand Product Y50-N18L-A3 is a 12V 21AH 350 Cold Cranking Amps (CCA) Sealed Lead Acid (SLA) Battery Dimensions: 8.07 inches x 3.42 inches x 6.37 inches. Polarity: Negative on left, Positive on right. Listing is for the Battery and Screws only. No wire harness or mounting accessories included. SLA / AGM spill proof battery has a characteristic of high discharge rate, wide operating temperatures, long service life and deep discharge recover. Rechargeable battery that can be mounted in any position, resists shocks and vibration. Long lasting high performance in high and low temperatures. Backed by a 30 day refund policy and full 1 year warranty.