Converter bottom: compatible with Worx bigfoot (green)20V lithium ion battery; Compatible with Kress 20V lithium ion batteries; Convertor top: Convert to for Hitachi & for Hikoki 18V Li-ion battery:BSL1815, BSL1815X, BSL1820, BSL1825, BSL1830, BSL1830C, BSL1840, BSL1850, BSL1860. Converter bottom applies to: Worx: WA3593,WA3595,WA3401, Big foot (green)20V lithium battery Kress : KPB2021 KCH2021, KPB2003, 20 v lithium-ion batteries; Convert Worx/Kress 5PIN 20V lithium battery to Hitachi 18V lithium battery tool, Use Worx/Kress 5PIN Large-foot 20V lithium batteries for Hitachi 18V lithium battery tools. It lets you share your Worx/Kress 5PIN 20V lithium battery with your Hitachi 18V lithium battery kit. This converter does not support the Worx/Kress 20V lithium battery with the Makita charger! Package Included: 1x Adapter (Only Adapter, No Battery) WARNING: Make sure that the battery is fully inserted for normal use Please do not force into the battery pack, if the battery pack can not be installed, the installation method may be wrong This product is only compatible with the tools, not compatible with the charger, Do not use the adapter to charge the battery When you need to charge the battery, remove the converter