Dry cell battery holders the worst for nitro. Fm or 2.4 is better. less interference and a fail safe is better than nothing to prevent a runaway. Am and Fm radios don't have fail safe feature unless its a computer type radio. Worst thing could happen is the rx crystal fall out and you watch...
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It doesn't come from a spring that doesn't prevent a runaway which causes damage and cost's you money$$$ I always check my battery voltage before running. It has a voltage cut off 4.8 volts.
To
total garbage.! This is 100% better. Stops intently! New Dynamite Fail-Safe Micro DYNR0101 605482292952 | eBay If your radio doesn't have fail safe feature. This would have prevented a runaway from the start. All the spring doses is close the carb. With a fail safe feature if the signal or...