2S4000DX8 : 7.4v 4000mAh LiPO battery for SPEkTRUM
2S4000DX8 : 7.4 volt 4000mAh rechargeable Li-PO battery for SPEkTRUM DX7s, DX8, DX9. Also fits in new versions of DX6. Dimensions 68mm x 52mm x 19mm (2.7" x 2" x 0.75").
Re-charges in SPEkTRUM Tx, or with external smart balance chargers such as B3AC, YT-0006S, UP100AC, HiTEC X4AC PRO, etc.
Replaces original SPEkTRUM battery SPMB4000LPTX.