Battery spacer
This is my very own mod ;o) and it prevents the aft end of the battery from sagging. Superglue a piece of balsa to the bottom of the radio shelf, just in front of the undercarriage. Its lower edge should follow the line of the angled plastic guards either side of the motor pinion.
The front of the battery is now prevented from rising, so you should have no more saggy-arsed batteries!
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