Mighty Max Battery YTX20L-BS Gel 12V 18AH Replacement for SurePower (Douglas) 20L-BS Brand Product YTX20L-BSGEL is a 12V 18AH 270 Cold Cranking Amps (CCA) GEL (Maintenance Free) Battery Dimensions: 6.88 inches x 3.42 inches x 6.10 inches. Polarity: Negative on left, Positive on right. Listing is for the Battery and Screws only. No wire harness or mounting accessories included. Factory activated GEL battery. Maintenance free. No acid pack needed. Advanced design works right out of the box and requires no maintenance yet offers the option to prolong the standard life by adding extra electrolytes. True deep cycle battery that can be mounted in any position, Resists shocks and vibration. Long lasting high performance in high and low temperatures. Environment friendly, leaving no pollution to the environment while charging and discharging. Zero fumes or chemicals escape the battery casing. All chemical reactions are done within the battery itself.