Absolutley NOT! The A1/A2 ports have a maximum voltage that is well below that of a normal flight battery. Connecting your full battery voltage (assuming you're probably talking about a normal flight battery such as a 3S battery), across these pins will make the magic smoke come out!
You'll need the FrSKy battery voltage sensor (simple voltage divider) to bring the sensed battery voltage down into the usable range of the Telemetery port. You can build your own if you wish or spend the $$s to get the FrSky version.
Turnigy 9x, FrSky 2-Way/Telemetry DHT DIY, Smartieparts BRD, ER9x FW
AXN-Floater (stock esc, motor & prop, HK orange 9g servos)