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: B0CHKPBTT6 -- Audiobox ABX-214R Dual 12" Portable Bluetooth Speaker, Lite Weight but Loud with BASS, RGB Party Lights, Wireless Microphone - Ultimate Sound Experience with Volume, Treble, & Bass Controls Connectivity technology: Powerline Input voltage: 110.0 volts_of_alternating_current Connector gender: Male-to-Female Connector type: 2-Pin Special feature: High Quality saschedross AC Adapter Replacement For Audiobox ABX-214R ABX214R 7.4V 3600mAh Li-ion Battery Dual 12" PA Loud Deep Bass Portable Party Karaoke Speaker 9VDC Power Supply Mains PSU