(Note: w/ Barrel Round Plug. NOT 2-Prong Connector. Someone may have bought it by mistake. Please Check For Compatibility With Your Unit. Thanks.) Tested Units. In Great Working Condition. Kircuit New USB 4.2V DC 4.2VDC Charging Cable Power Supply Charger Cord Compatible with Wybot Hyson 100 HJ10P HJ10P-A HJ10PA 4150A3E Hyson100 5200mAh 5.2Ah 5200 mAh 5.2 Ah Li-ion Liion Rechargeable Battery Pack Handheld Cordless Robotic Automatic Pool Vacuum Robot Floor Cleaner (Note: w/ Barrel Round Plug. NOT 2-Prong Connector. Someone may have bought it by mistake. Please Check For Compatibility With Your Unit. Thanks.) !!!Tips: 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. Compatible with listing item ASIN: B0CMCS8VMD -- WYBOT 2024 New Cordless Pool Vacuum with Telescopic Pole, Dual Suction Heads, 60 mins Running Time, Strong Suction, Handheld Pool Vacuum Pool Cleaner for Deep Clean Spas/Hot Tubs/Pool Steps Corners / B0CPJ25CYT -- WYBOT Cordless Pool Vacuum with Telescopic Pole, Handheld Rechargeable Pool Cleaner for Deep Cleaning with 60 Mins Runtime, Powerful Suction, Ideal for Above Ground Pools/Spas/Hot Tubs Kircuit AC adapters are tested and designed to meet the power needs of your device. This adapter converts AC power into the DC power required by your device. This supply allows you to operate your device or charge its battery from electrical power outlets. Kircuit Adapters are a portable power source for when your on the go, at home or office. This adapter has been validated and tested to ensure it will work with your device.