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The XT511 can be powered with AA batteries, its internal rechargeable battery, a DC power supply, AC power supply, and the crank arm. The XT511 can be powered with AA batteries, its internal rechargeable battery, a DC power supply, AC power supply**, and the crank arm. <nowiki>**</nowiki> The [[AC_DC_Adapter_Reference#Midland_18-394|Midland 18-394 MODEL: U090030D]] AC adapter is rated 9 volts at 300ma. It supplies enough current to charge the battery pack, operate the radio. It will allow you to transmit at the low TX power setting. It has insufficient current to allow for transmit at the high TX power setting. An aftermarket 9v AC adapter is recommended with at least 1000mA rating or higher.''Update: It should be noted that the AC adapter does not power the radio directly. I provides low current to charge the battery. The radio cannot be operated directly from the AC adapter without battery installed. Using a higher current adapter of the same voltage is irrelevant since the internal circuit within the transceiver is design only for charging.''[[File:MidlandBaseCampandFamilyofRadios.jpg]]