When shopping for FPV radios & batteries, the main trap is treating a receiver and a LiPo battery as interchangeable upgrades. They are different purchases, and the three ExpressLRS receivers here also differ in channel support, fixed-wing focus, and signal-related features. Start by deciding whether your build needs control hardware or flight power; then match the receiver to the model and connection needs.
Quick take
Three entries are ExpressLRS receivers, while the HRB bundle is a separate battery purchase. Decide that split first. For the receivers, focus on model type, channel needs, and signal-related features rather than assuming a larger number automatically means a better choice.
Listed-price comparison
The listed prices separate the battery bundle from the receivers. The bars provide a visual price comparison, not a performance ranking.
| Product | Listed price | Price bar | What it is |
|---|---|---|---|
| RadioMaster ER4 ExpressLRS 4-Channel Receiver | USD 17.49 | ExpressLRS PWM receiver | |
| RadioMaster ER8 ExpressLRS 8-Channel Receiver | USD 40.99 | ExpressLRS fixed-wing receiver | |
| RadioMaster RP3 V2 ExpressLRS Receiver | USD 22.49 | ExpressLRS receiver with diversity features | |
| 2x HRB 5200mAh 4S 14.8V EC5 LiPo Battery | USD 79.99 | Two-battery LiPo bundle |
Decision matrix
- Compact model control: ER4, whose description names small aircraft, boats, cars, and four PWM channels.
- Fixed-wing servo setup: ER8, with support for eight servos.
- Signal-stability features: RP3 V2, with antenna diversity, a built-in TCXO, and WiFi updates.
- Flight power rather than control: HRB, the two-battery LiPo bundle.
- Lowest receiver price: ER4 at USD 17.49.
Product notes
RadioMaster ER4 ExpressLRS 4-Channel Receiver
The ER4 suits a build calling for a RadioMaster ExpressLRS receiver with four simultaneous PWM channels. Its description emphasizes compact design, high-speed response, flexible configuration, and ultra-long-range capability. That makes the receiver relevant to small aircraft, boats, cars, and other models where control hardware is the need. Its limitation is the four-channel ceiling, so it is not the channel-count match for a setup built around eight servos. It also handles control reception rather than battery power; an FPV LiPo remains a separate purchase. The listed price is the lowest in this comparison, but it does not turn the receiver into a battery solution.
RadioMaster ER8 ExpressLRS 8-Channel Receiver
ER8 is aimed at fixed-wing users who need support for eight servos. It runs on the 2.4GHz ELRS platform and lists a 20cm high-sensitivity antenna, DC 4.5-8.4V power supply, 16.5g weight, and 43×30×15mm size. Those details give it a defined role beyond choosing by protocol alone. The limitation is that specialized role: a model that does not need eight servo connections may not use its main distinction. At $40.99, it is also priced above ER4 and RP3, so the servo requirement should lead the decision rather than price alone.
RadioMaster RP3 V2 ExpressLRS Receiver
RP3 V2 fits a setup where antenna diversity, a built-in TCXO, and WiFi firmware updates matter. Its description also lists a 2.404-2.479GHz frequency range, 5V working voltage, and 500Hz/F1000Hz refresh figures, alongside low-latency and long-range performance. The limitation is scope: it is receiver hardware, not a battery, so it does not address the power side of an FPV build. Choose it for the stated signal-stability features rather than assuming any numeric refresh figure is automatically superior. Its $22.49 price keeps the comparison focused on receiver features rather than battery capacity.
2x HRB 5200mAh 4S 14.8V EC5 LiPo Battery
HRB is the power-focused choice: the bundle contains two 5200mAh 4S 14.8V LiPo batteries with EC5 connectors. It also lists a 100C continuous-discharge rate, 2C suggested charge rate, JST-XHR-5P balancer connector, and 482g weight per battery. Those details define a clear power-system format. The limitation is specificity: 4S, 14.8V, EC5, and the listed dimensions need to suit the intended setup. HRB cannot replace the ExpressLRS receivers, and its $79.99 listed price reflects a two-battery purchase rather than control hardware.
Final recommendation by use case
Start by separating the purchase type. For compact model control, choose ER4. For fixed-wing servo work, choose ER8. For antenna-diversity and TCXO features, choose RP3 V2. For a paired LiPo power purchase, choose HRB. The price gap is $62.50 from ER4 to HRB, so the higher figure reflects the different category role and two-battery format rather than a receiver upgrade. If the lowest receiver price is decisive, ER4 is the straightforward pick; if power is the need, HRB is the relevant match.
