I'm not recommending going against what's recommended but I will say.........

A 6 volt nimh or nicd fully charged is 1.45x5=7.25 volts. A life pack fully charged is maybe 7.4 volts for a few moments and settles into 6.8-6.9 fully charged, so I don't see the problem.

Has not been a problem on Hitec standard servos but can't speak to Futaba.

You might lose point/something... in volts by adding the extensions.



From Towers site

"This is the Futaba S3305 High Torque, Metal Gear Servo. per Futaba this servo is approved for use with NiCd batteries ONLY!
This servo can produce high-current draw from your batteries. If using NiMH or LiPo batteries, make sure they are capable of delivering sufficient amps. "
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SO the point is to use batteries that can provide the current draw and LIFE certainly can.

They are warning against hi capacity nimh with high internal resistance that can't provide the amps draw!!</p></pre>