Choosing among FPV radios & batteries can feel confusing when receiver hardware and charging accessories appear side by side. The key decision is simple: do you need radio reception for a model, or a better way to manage DJI FPV batteries? Once that is clear, channel capacity, signal-focused features, charging workflow, and condition make the choice easier.
Quick take
Three of the choices here are RadioMaster ExpressLRS receivers, while the Genuine DJI item is a charging hub. Treat them as two different buying paths rather than direct substitutes. Pick a receiver according to the control and signal requirements of the model; pick the hub when the task is expanding a DJI FPV charging setup.
Listed-price comparison
The four prices span $17.49 to $40.99, creating a $23.50 spread from the lowest to the highest. The table keeps the price comparison separate from the feature decision, since the least expensive item and the highest-priced item serve different receiver roles.
| Product | Listed price | Price bar |
|---|---|---|
| RadioMaster ER4 Receiver | USD 17.49 | |
| RadioMaster RP3 V2 Receiver | USD 22.49 | |
| Genuine DJI FPV Charging Hub | USD 36.80 | |
| RadioMaster ER8 Receiver | USD 40.99 |
Decision matrix
- Four simultaneous PWM channels: Choose the RadioMaster ER4 ExpressLRS 2.4GHz 4-Channel Receiver.
- Eight-servo fixed-wing use: Choose the RadioMaster ER8 ExpressLRS 2.4GHz 8 Channel Receiver.
- Antenna and signal-stability features: Choose the RadioMaster RP3 V2 ExpressLRS 2.4GHz Receiver, with antenna diversity and a built-in TCXO.
- Charging three additional DJI FPV batteries in sequence: Choose the Genuine DJI FPV Battery Charging Hub when connected to a DJI FPV charger.
Product notes
RadioMaster ER4 ExpressLRS 2.4GHz 4-Channel Receiver
The RadioMaster ER4 is a sensible fit for models that can use four simultaneous PWM channels. Its compact design and stated support for small aircraft, boats, cars, and other models give it a broad hobby-use profile. The reason to choose it is the combination of a 2.4GHz ExpressLRS receiver format and a clearly defined four-channel layout. That same channel count is its limitation: it is not the eight-servo receiver described for the ER8. The ER4 is marked new and carries the lowest listed price in this comparison, making it the direct choice when its channel specification matches the build.
RadioMaster ER8 ExpressLRS 2.4GHz 8 Channel Receiver
The RadioMaster ER8 is designed for fixed-wing users and supports eight servos, so it fits a setup where the four-channel ER4 specification would not cover the control requirement. Its listed 20cm high-sensitivity antenna and DC 4.5-8.4V power specification add useful planning details for the installation. The main limitation is physical and financial: the receiver is listed at 43x30x15mm, weighs 16.5g, and has the highest price here at USD 40.99. Choose the ER8 for the eight-servo brief rather than for a smaller model whose requirements are already met by a four-channel receiver.
RadioMaster RP3 V2 ExpressLRS 2.4GHz Receiver
The RadioMaster RP3 V2 is the receiver to consider when the design emphasis is signal stability and long-range performance. Its description calls out antenna diversity, a built-in TCXO, an LNA, a PA, and Wi-Fi updates through ExpressLRS firmware. Those are concrete reasons to choose it over a simpler receiver design. A practical limitation is its listed DC 5V working voltage, which needs to be part of the power plan. The RP3 V2 is also specifically a receiver, so it does not address a separate battery-charging need. Its new condition and USD 22.49 price keep the focus on receiver features rather than charging hardware.
Genuine DJI FPV Battery Charging Hub
The Genuine DJI FPV Battery Charging Hub serves a different purpose from the three RadioMaster receivers. When connected to a DJI FPV charger, it can expand the setup to charge three additional batteries in sequence. That makes it the concrete pick for a DJI FPV owner organizing multiple-battery charging rather than adding control channels. The listed charging time is about 55 minutes and is subject to temperature, so the timing is not a fixed promise. Open-box condition is the main limitation compared with the new receiver choices. The hub is listed at USD 36.80 and is compatible with DJI FPV, keeping its use case specific to that charging setup.
Final recommendation by use case
- For compact models and a four-channel receiver brief: RadioMaster ER4 ExpressLRS 2.4GHz 4-Channel Receiver.
- For fixed-wing control with eight servos: RadioMaster ER8 ExpressLRS 2.4GHz 8 Channel Receiver.
- For a receiver centered on antenna diversity and signal-stability hardware: RadioMaster RP3 V2 ExpressLRS 2.4GHz Receiver.
- For expanding a DJI FPV charger to handle additional batteries: Genuine DJI FPV Battery Charging Hub.
The best match depends first on function, not on placing a receiver and a charging hub on the same price ladder. Use the $23.50 price spread as a final tie-breaker only after the channel, signal, compatibility, and condition requirements are clear.
