B-Grade Lithium Polymer packs are great for those not-so-important models or testing. They have a high internal resistance (thats bad), normally wont last past 60 full high-discharge cycles and may become puffy over time. B-Grade packs are structurally sound, but lack the performance of our A-Grade packs such as Flightmax, Rhino and TURNIGY. hexTronik usually sells B-grade batteries to smaller vendors who in turn sell online at a discount. However were now offering them to you at discounted prices, for those not-so-serious applications. Spec. Minimum Capacity: 3300mAh Configuration: 4S1P /14.8v/ 4Cell Constant Discharge: 30C Pack Weight: 375g Pack Size: 126 x 43 x 29mm Charge Plug: JST-XH Discharge Plug: HXT-4mm B-grade packs are sold as is and no warranty is implied or given PRODUCT ID: B3300.4S.30C Capacity(mAh) 3300 Config(s) 4 Discharge(c) 30 Weight(g) 375 Max Charge Rate (C) 5 Length-A(mm) 126 Height-B(mm) 43 Width-C(mm) 29