Choosing FPV radios & batteries is difficult because the search can mix tiny-whoop power packs, larger RC batteries, and an ExpressLRS receiver-components with different jobs. The fastest way to narrow it down is to identify the role first, then match voltage, connector, and model application. This comparison separates those paths so a small Beta FPV setup, an RC power system, and a 2.4GHz control link each get a sensible starting point.
Quick take
- Small-drone battery: 4X Ovonic Tiny Whoop battery
- RC battery pair: 2pcs HRB XT90 battery
- Battery bundle: 2x HRB EC5 battery
- Control receiver: RadioMaster ER4 receiver
The three LiPo options are not interchangeable by price alone: their cell formats, connectors, and applications differ. The RadioMaster is a receiver, so compare it by control-link needs rather than battery capacity.
Listed-price comparison
| Product | Listed price | Price bar |
|---|---|---|
| Ovonic Tiny Whoop battery | USD 22.99 | |
| HRB XT90 battery | USD 93.99 | |
| HRB EC5 battery bundle | USD 79.99 | |
| RadioMaster ER4 receiver | USD 17.49 |
The prices span USD 17.49 to USD 93.99, a USD 76.50 difference. That spread reflects different component roles and pack formats, not a like-for-like quality ladder.
Decision matrix
Use this role-first path:
- Small FPV drone: the Ovonic battery is the dedicated branch.
- RC or FPV power system: compare the two HRB batteries using their named connectors and electrical formats.
- Control link: the RadioMaster ER4 is the receiver branch.
- Price as tie-breaker: use the table only after the component role and fit are clear.
This structure keeps a receiver and a battery from being treated as competing versions of the same product, while leaving the two HRB options for a more focused connector-and-voltage comparison.
Product notes
4X Ovonic 100C 850mAh 3.8V HV LiPo Battery BT2.0
The 4X Ovonic 100C 850mAh 3.8V HV LiPo Battery is a focused choice for a small Beta FPV or Tiny Whoop build. Its 1S, 3.8V HV, 850mAh, and 100C configuration uses BT2.0 for both charge and discharge, matching the small-drone applications named with it. The four-pack format gives four matching batteries for a session. The limitation is scope: 1S and BT2.0 make this a specific small-drone option rather than a general substitute for the EC5 or XT90 packs. The Tiny Whoop use case-not price-should drive the choice.
2pcs HRB XT90 4000mAh 6S LiPo Battery
Built for a different kind of model, the 2pcs HRB XT90 4000mAh 6S LiPo Battery names RC drones, helicopters, cars, and FPV among its uses. The 22.2V, 4000mAh format, XT90 female plug, and 7PINS JST-XH balance connector offer concrete matching points for a 6S setup. The two-piece package gives two packs in one purchase. Its limitation is physical and electrical specificity: the voltage, dimensions, and plug need to match the model, so it is not a casual choice for a BT2.0 Tiny Whoop setup. The 590g weight and 135×42×49mm dimensions also make physical format an important selection detail.
2x HRB 5200mAh 4S 14.8V EC5 LiPo Battery
For a 4S build, the 2x HRB 5200mAh 4S 14.8V EC5 LiPo Battery supplies clear selection anchors: 5200mAh capacity, EC5 connector, 4S cells, and a JST-XHR-5P balancer connector. Its applications cover RC trucks, helicopters, airplanes, and FPV, and the package includes two batteries. Choose it when those model types and connector details line up with the build. The limitation is that 4S, 14.8V, and EC5 are specific requirements; the 5200mAh number alone does not establish fit. It remains a distinct alternative to the XT90 6S battery rather than a replacement for every RC power setup.
RadioMaster ER4 ExpressLRS 2.4GHz 4-Channel Receiver
The RadioMaster ER4 ExpressLRS 2.4GHz 4-Channel Receiver fills a separate role from the LiPo packs. It supports four simultaneous PWM channels and is presented for small aircraft, boats, cars, and other models needing a lightweight receiver. ExpressLRS 2.4GHz, flexible configuration, and ultra-long-range capability are the key reasons to choose it for a control-link project. The limitation is scope: it is a receiver with four PWM channels, not a battery, so it should not be compared with the packs by capacity. Use the RadioMaster when the control system-not power capacity-is the missing component.
Final recommendations by use case
- Beta FPV Tiny Whoop: choose the Ovonic Tiny Whoop battery.
- 6S system with matching XT90 hardware: choose the HRB XT90 battery.
- 4S system with matching EC5 hardware: choose the HRB EC5 battery bundle.
- ExpressLRS 2.4GHz control link: choose the RadioMaster ER4 receiver.
If price is the tie-breaker after fit, the RadioMaster is USD 17.49 and the Ovonic is USD 22.99, while the two HRB battery choices are USD 79.99 and USD 93.99. The USD 76.50 spread across the group is meaningful, but role and connector remain the first filter.
