Micro USB Charging Cable Charger Power Cord Compatible with Rokform G-ROK GROK 336501 Portable Golf Speaker 3600mAh Battery DC5V 1000mA 5VDC 1.0A 5.0V Power Supply PSU Compatible with: Rokform G-ROK GROK 336501 Portable Golf Speaker 3600mAh Battery DC5V 1000mA 5VDC 1.0A 5.0V Power Supply !!!Note: Rechargeable batteries don't last forever, the average battery last 1 to 3 years. If the battery is old/dead, it will not accept a charge. But not charger's problem. If you're not sure whether battery or charger is dead or not. You must have a volt meter in order to tell whether or not a charger is working.