Unfortunately, the internal Ni-MH battery in the KATANA-MINI X is not user-replaceable or available for purchase as a separate replacement part.
If the battery drains unusually fast or cannot be charged at all, please try the steps outlined in the Troubleshooting section. If the battery issue persists after troubleshooting, you may need to seek repair. Please consult your nearest dealer or contact us through Backstage for further assistance.