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Smart G2 Powerstage Bundle for Surface 4S SPMXG2PS4 The Smart G2 Powerstage bundle is a one-box solution for vehicles requiring top performance. Designed with the simplicity of Smart G2 Technology, this bundle includes (2) 5000mAh 2S 50C Smart G2 LiPo Batteries, and (1) S2200 Smart G2 Dual Port AC Charger. Overview SPEKTRUM SMART G2 BATTERY Drivers enjoy even more Smart advantages when using Spektrum™ Smart G2 50C LiPo batteries to power their vehicles. "Generation 2" features make these LiPo packs — featuring a 50C continuous discharge rating for high performance and longevity — even simpler and safer to use together with your Smart charger. For example, Spektrum™ Smart G2 technology makes it much easier to balance charge your LiPo batteries. Balancing information travels through the unique data wire of each Smart G2 battery's innovative IC3® or IC5® connector. As a result, only a single connection is needed — no separate balance lead is required. Smart G2 batteries come from the factory programmed to discharge automatically to a safe storage voltage of 3.90V after 72 hours of inactivity. The benefits include longer battery life, better performance over the life of the pack, and the peace of mind that comes from knowing your Smart battery is maintenance-free. G2 batteries also offer a storage discharge rate that's three times faster than the previous G1 Smart batteries.