can 2 batteries pack burn rc car receiver

[VanEli]

No, you should not connect two battery packs directly to your RC car receiver. The receiver is designed to operate at a specific voltage, typically around 5-6V from a BEC (Battery Eliminator Circuit) in the electronic speed controller (ESC) or a single 4.8V NiMH battery pack. Connecting two batteries in a way that increases voltage will almost certainly fry the receiver and connected servos instantly. Even if the voltage remains the same, parallel connections create significant risks of imbalance and damage.

The primary danger is exceeding the receiver's voltage limit. Most standard receivers for surface RC vehicles are built to handle a maximum of 6.0V to 7.4V. Connecting two common 2S LiPo batteries (each 7.4V nominal) in series would create a 14.8V supply, which is guaranteed to cause immediate, irreversible damage.

Power Configuration	Total Voltage	Risk to Receiver	Outcome
Single 2S LiPo via ESC's BEC	5V-6V (regulated)	None	Safe, normal operation.
Single 4-cell NiMH Pack	4.8V - 6.0V	None	Safe, normal operation.
Two 2S LiPo in Series	14.8V	Extreme	Instant destruction of electronics.
Two 2S LiPo in Parallel	7.4V (unregulated)	High	Likely exceeds voltage limit; risk of battery imbalance and fire.

If you need longer run times, the correct method is to use a single, larger capacity battery pack. If you require a higher voltage for high-torque servos, you must use a dedicated external voltage regulator or a receiver pack specifically designed for that purpose, which provides a stable, safe voltage. The safest and most effective approach is always to rely on the ESC's built-in BEC, which is engineered to deliver clean, consistent power to your receiver and servos.

[EllianaDella]

Absolutely not, it's a surefire way to fry your electronics. I learned this the hard way when I was a kid. The receiver and servos can't handle the extra voltage. If you're trying to get more run time, just buy a single battery with a higher mAh rating. That's the only safe way to do it. Don't risk burning up your whole car for a few extra minutes.

[JosephineAnn]

Think of your receiver like the brain of your car, and it needs a very specific amount of power to work correctly. Hooking up two batteries is like forcing that brain to run on a power line meant for a major appliance. It will instantly overload and burn out. The correct solution for longer operation is a higher-capacity battery, not more batteries. Always check the voltage specifications on your components before connecting anything.