This is a generic, equivalent one, 100% compatible. This 20V 4000mAh Replacement Li-ion battery is designed to compatible with Worx WA3551 WA3551.1 WA3553 WA3553.1 WA3553.2 WA3641 WX373 WX390.

Specifications:
* Product Type: generic/equivalent
* Battery Voltage: 20V
* Battery Capacity: 4000mAh
* Chemistry: Li-ion
* Condition: new, 1 Year Warranty!
* It is easy to use, convenient to carry with.
* No memory effect, Integrated microchip prevents overcharging & lengthens battery life.

Compatible Part Numbers:
WA3551, WA3551.1, WA3553, WA3553.1, WA3553.2, WA3641

Compatible with the following Worx Power Tools models:
For Worx WX386, WX386.9, WX550.1, WX550.9, WX384.1, WX166.3, WX176, WX178.9, WX279, WX279.9, WX290.9, WX290.9, WX390, WX367, WX550, WX176, WX373, WX390

Package Included:
1 x 20V 4000mAh Replacement Battery for Worx WA3551 WA3551.1 WA3553 WA3553.1 WA3553.2 WA3641 WX373 WX390

NOTE:
1.The battery must be FULLY charged before first use.
2. The battery is stored in a cool and dry place.
3. Do not Separation, extrusion, and impact.
4. Do not put battery into water and fire.
5. Keep away from children.