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: 5000mAh Configuration: 3S1P /11.1v/ 3Cell Constant Discharge: 25C Pack Weight: 421g Pack Size: 147 x 50 x 27mm Charge Plug: JST-XH B-grade packs are sold as is and no warranty is implied or given Capacity(mAh) 5000 Config(s) 3 Discharge(c) 25 Weight(g) 421 Max Charge Rate (C) 2 Length-A(mm) 147 Height-B(mm) 50 Width-C(mm) 27