Please make sure your Shark battery model is RVBAT850 and the connector (plug) is 2 prongs. Please double confirm the battery model and connector to avoid buying a wrong product. Compatible with Shark Ion R75, R85, RV850, RV850C, S87, RV851WV, RV871, RV871C, RV761, RV1000S, UR1000SR, AV752, AV751 RV1000S, RV1100VL, RV101AE vacuum cleaners. NOT compatible with any other battery with 3 prongs connector (plug). Product has obtained UL2054, IEEE62133-2 and UN38.3 standard certifications. Professional battery management system (BMS) provides reliable multiple safety protection functions for short-circuit, over-charge, over-voltage, over-heat and over-current. Easy installation, comply with RoHS standard. 14.4v/14.8v 3200mAh Li-ion power battery makes your vacuum run longer and more reliable. If the vacuum has not been used for long time, please fully charge it at least once a month or take out the battery to avoid battery starvation. Committed 24/7 response to online message. 1 year limited warranty. Go to the product detail page, find the seller's name under Sold By and click on it; then, select Ask a Question to send a message. Product has obtained UL2054, IEEE62133-2 and UN38.3 standard certifications. Please make sure your Shark battery model is RVBAT850 and the connector (plug) is 2 prongs. Compatible with Shark Ion R75, R85, RV850, RV850C, S87, RV851WV, RV871, RV871C, RV761, RV1000S, UR1000SR, AV752, AV751 RV1000S, RV1100VL, RV101AE vacuum cleaners. Please double confirm the battery model and connector to avoid buying a wrong product. Professional battery management system (BMS) provides reliable multiple safety protection functions for short-circuit, over-charge, over-voltage, over-heat and over-current. Easy installation, comply with RoHS standard. 14.4v/14.8v 3200mAh Li-ion power battery makes your vacuum run longer and more reliable. Committed 24/7 response to online message. 1 year limited warranty. Go to the product detail page, find the seller's name and click on it; then, select Ask a Question to send a message .