In the choice of rechargable or non-rechargble batteries, we has to consider the consumption. If few and small servos are used, then non-rechargble can be a good choice because other parts will break before the batteries run out.
This can be tested if you scale up the frequency that servo is pulsed, which means, if servo turns 100 times a day, but instead you make it turn 700 times a day, you are actually simulating a week of operation.
However, as we are using strong servos, a 9V Energizer battery 150mAh would support no more than a few days, when audience actively participated.
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