【Wide Compatibility】Replacement for Worx 20 volt max battery 3520 etc. It also compatible with Worx tools series . It perfom as well as original battery to meet your needs. 【Comprehensive Protection】Made of high-quality battery cells and designed with built-in overcharge, over-discharge, over-current protection, short circuit protection, overheat protection and constant voltage circuit. You can use it safely on your tools. 【Durable Material】Made of ABS + PC material, which is durable and hard. Therefore, it can protect this battery from external damage at use to prolong lifespan. It can help you reduce the times of battery replacement. 【Precise Interface】The conductive metal sheet of our battery is made of pure alloy. The exquisite structure design helps you to quickly insert our battery into original tools and compactly mounted on the conductive port. It helps charge and discharge more smoothly. 【Excellent Customer Service】We provide 30-day no-reason return and exchange service and professional after-sales service to help you solve your problem. If you have any questions, please send us an email and we will get back to you ASAP. Amityke 6.0Ah 20V Battery Replacement for Worx Batteries 20V Battery Compatibility and Excellent Safety Compatible with Worx 20V Tools