Polarity: Negative on left, Positive on right.
The Performance and Characteristics of the YT12B-4 GEL Battery includes maintenance Free / GEL configuration, No leaks, spills or contact with acid, no acid mist and pollution to the environment when charging and discharging, High capacity: 10-20% higher comparing to that of VRLA, low self-discharging and durable for storage, nice ability for resilience after over-discharge and the capacity of high discharge current increases by 30% over VRLA, amazing performances in all temperature conditions. No wire harness or mounting accessories included.