ASK accumulators were developed by NovAK Ltd. specifically for automation and telemechanics systems of JSC "Russian Railways" to replace accumulators of ABN and OP types. ASK accumulator has better characteristics due to the introduction of arsenic-tin ligature in the positive lattice composition and new patented paste composition. Dry charged batteries can be supplied. ACK Specifications: Capacity (C10): 77 Ah to 777 Ah Positive electrode: PbSb alloy (1.7% Sb) Negative electrode: PbSb alloy (5% Sb) Number of charge-discharge cycles: 960 - 1200 Features: Transparent SAN casing Water refill every 1 to 3 years The use of modern filter plugs allows the design to be explosion-proof and reduces the number of water refills.