Running JR 8900 on A123 (2S /2300mAh)

[HAWK 30]

There is also this Spektrum regulator: Spektrum VR5203 Dual Output Regulator SPMVR5203

But again out of stock unfortunately but they look to be in stock here:

Lowest prices for Spektrum VR5203 Dual Output Regulator : Brentford Radio Control Centre
Spektrum - VR5203 Duel Voltage Regulator - SPMVR5203 - ModelmaniacsOnline.Co.Uk


I just went ahead and ordered a HV tail servo...

Thank you for the links Laurence. I think a HV tail servo is a safe but expensive bet. Right a HV tail servo it is.

Thanks you all for the replays and advice.