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Futaba 9.6V TX Charge & Ace/Alpha 4 2.5mm Male Futaba J Power Port Connector 6-Pack
This is the plug that goes into your Futaba transmitter to charge the Tx batteries. The center port of the plug (short spade internal connector) is negative. These are also used as output plug on Ace and Alpha 4 chargers. Above listed at $1.25 each. Choose your 6-pack deal here! SKU Number: RRCTXPP2.5MFJPK
 "Futaba 9.6V TX Charge & Ace/Alpha 4 2.5mm Male Futaba J Power Port Connector 6-Pack")