【Compatible with Shark RVBAT850 Battery】Please make sure your Shark battery model is RVBAT850 and the connector (plug) is 2 prongs, not 3 prongs. Please double confirm the battery model and connector to avoid buying a wrong product. 【Wide Compatible】Compatible with 2-Prong Connector: Shark Ion RV700_N, RV720_N, RV725_N, RV750_N (Attention the "_N" of model), R75, R85, S87, RV751, RV761, RV771, RV850, RV850C, RV850BRN, RV850WV, RV851WV, RV871, RV871C, RV912S, RV913S, RV1000, RV1000S, UR1000SR, RV1001, RV1001AE, RV1100VL, AV751, AV752, AV753, AV911S, AV970 robot vacuum. 【Important Tips】NOT compatible with Shark Ion RV700, RV720, RV750, RV755 robot vacuum because they are 3 prongs connector (plug). 【Safety & Reliable Quality】Built-in professional battery management system (BMS) provides reliable multiple safety protection functions from short-circuit, over-charge, over-voltage, over-heat and over-current. Complied with CE, FCC, ROHS certified standards. 【Easy Installation & Reliable】Replacement battery for RVBAT850 shark Ion battery is easy to install and fits perfectly. We provide 12 months warranty and fast response service. Please feel free to contact us if you have any questions before or after purchase. Replacement Battery Pack for Shark Ion Robot RVBAT850