Keep your gear functioning optimally with help from the VMAX V35 857 AGM Deep Cycle Battery (Replaces East Penn Deka 8U1L GROUP U1). Power cells naturally lose power over time, making replacements a necessary part of routine maintenance. Signs that it might be time for a change include the original equipment holding its charge for less time or even taking longer to fully charge. This VMAX deep cycle battery is a worthwhile replacement with 12V 35Ah batteries. It offers maintenance free operation with no need to check specific gravity of the electrolyte or add water. This rechargeable sealed battery can be mounted in any position and resists shocks and vibration. It's sold individually.