Note: Rechargeable batteries typically last 1 to 3 years. If a battery is old or depleted,it may not charge,but this isn't necessarily the charger's fault. To determine if the charger is working,use a voltmeter. Compatible with listing item ASIN: B0CFWWJ2K5 - Compatible with Sharper Image Powerboost Palm Portable Percussion Massager,4 Attachments,Lightweight Travel,Whisper Quiet,Full Body Deep Tissue saschedross AC Adapter Replacement For Sharper Image Powerboost Palm 1017476 1017231 1014983 2321140 7.4V 2.2Ah Li-ion Battery Portable Percussion Massager Massage Gun Power Supply Mains PSU