About this item 【Battery Feature】: 21.6V, 4.0Ah, Lithium-ion no memory effects. CE, FCC, PSE, RoHS Safe Certified, you don’t need to worry about the battery damaging the machine. The battery is based on the original size and the function is same with the original battery. 【Fully Compatible with V6】: Replacement Battery, Not Original. Battery & Filters both compatible with V6 DC58 DC59 DC61 DC62 DC72 DC74, Absolute Animal Motorhead Slim, SV03 SV04 SV05 SV06 SV07 SV09 ...... 【4.0Ah Higher Capacity】: Made with high quality cells and last 45% longer duration than others. Can be charged with original V6 charger about 3 hours. 4.0Ah higher capacity means longer duration than 3.5Ah. 【Easy to Install & Safe Charge】: Easy install and it fits perfectly.Cleaning up all the dog hair and whatever else was on the floor; Integrated charging indicator: Steady blue means charging, light off means charging completed. Flashing yellow means error occurred. 【Warm Note】: Just after using the battery, the battery will heat up. This is a normal phenomenon. Please do not charge it immediately, otherwise it will give a red light alarm and affect the battery life. Recommendation: Wait to cool before charging. 30 days money back, 12 months warranty. Within 24h customer service.