When shopping for FPV radios & batteries, the hardest part is often recognizing that the four pieces here do different jobs. A charging hub, an AC adapter, a 6S battery pair, and an ExpressLRS receiver should not be judged by the same yardstick. Match the component to your immediate build need first, then use price and fit to break ties. In this comparison, DJI FPV owners have two charging choices, the HRB pack is a power choice, and the RadioMaster is a control-link choice.
Quick take
Treat this as a component match, not a head-to-head contest.
- Need more DJI FPV charging capacity? Choose the DJI FPV Battery Charging Hub.
- Need AC power hardware? Choose the DJI FPV Drone Battery Charger AC Power Adapter CDX170-90.
- Need a two-pack of 6S batteries? Choose the HRB XT90 4000mAh 6S LiPo pair.
- Need an ExpressLRS receiver? Choose the RadioMaster RP3 V2.
Listed-price comparison
The listed prices run from $22.49 to $93.99, a $71.50 spread. That range is meaningful, but the products are not interchangeable; the table is a price reference rather than a performance ranking.
| Product | Listed price | Price bar | Primary role |
|---|---|---|---|
| DJI FPV Battery Charging Hub | USD 36.80 | Sequential charging expansion | |
| DJI FPV Drone Battery Charger AC Power Adapter CDX170-90 | USD 29.99 | AC power adapter | |
| HRB XT90 4000mAh 6S LiPo Battery 2-Pack | USD 93.99 | 6S FPV battery pair | |
| RadioMaster RP3 V2 ExpressLRS 2.4GHz Receiver | USD 22.49 | ExpressLRS receiver |
Decision matrix
- Charging expansion: The DJI FPV Battery Charging Hub is the match for an existing DJI FPV charger that needs sequential battery handling.
- Adapter replacement or addition: The CDX170-90 is the direct choice for the AC adapter role and includes a power cord.
- Compatible 6S power: The HRB pair makes sense when an RC model accepts its voltage, dimensions, and XT90 connection.
- Long-range control link: The RadioMaster RP3 V2 belongs in a build using ExpressLRS at 2.4GHz.
Product notes
DJI FPV Battery Charging Hub
The DJI FPV Battery Charging Hub is the clearest choice when one DJI FPV charger needs to handle multiple batteries in sequence. Connected to a DJI FPV charger, it adds capacity for three additional batteries and is listed in black with DJI FPV compatibility. That makes it a focused expansion for an existing DJI FPV charging setup. The limitation is the listed open-box condition, so shoppers should treat it as a hub component rather than a new standalone charger. The title identifies it as a charging hub, so it serves a different role from the AC adapter below.
DJI FPV Drone Battery Charger AC Power Adapter CDX170-90
The DJI FPV Drone Battery Charger AC Power Adapter CDX170-90 suits the setup where the missing piece is AC power hardware for DJI FPV charging. It includes a power cord, accepts 100-240V input, and is identified as a 25.2V, 3.4A, 86W adapter. The model and MPN are both CDX170-90, giving this item a clear identity among the four choices. Its limitation is scope: an AC power adapter is not the charging hub, so it does not add the hub's sequential multi-battery function. Pick it when you need the adapter role rather than expanded battery handling.
HRB XT90 4000mAh 6S LiPo Battery 2-Pack
With two packs in one purchase, the HRB XT90 4000mAh 6S LiPo Battery 100C 22.2V pair is the battery-focused choice here. It lists Amass XT90 female plugs, 7PINS JST-XH balance connectors, 88.8Wh, and a suggested 0.5C-1C charge rate, giving a shopper several concrete fit points to compare with a compatible RC model. The limitation is physical and electrical matching: the listed 135×42×49mm dimensions, 590g weight, 6S voltage, and XT90 plug all need to suit the aircraft or vehicle. The pack also includes a usage notice to read before operating.
RadioMaster RP3 V2 ExpressLRS 2.4GHz Receiver
The RadioMaster RP3 V2 ExpressLRS 2.4GHz Receiver fills the control-link role for a build using ExpressLRS. Its feature set includes two antennas, antenna diversity, a built-in TCXO, 5V working voltage, and WiFi-enabled firmware updates. It is aimed at long-range FPV use, putting it in the receiver part of the decision rather than the charging or power part. The limitation is straightforward: it is a receiver, not a radio transmitter, charger, or battery. Choose it when the radio link is the unfinished piece, not when the build still needs DJI charging hardware or an FPV pack.
Final recommendation by use case
For an existing DJI FPV charging setup that needs sequential battery handling, choose the DJI FPV Battery Charging Hub. For the AC adapter role, choose the DJI FPV Drone Battery Charger AC Power Adapter CDX170-90. For a compatible RC model whose voltage, dimensions, and plug match the listed pack, choose the HRB XT90 4000mAh 6S LiPo Battery 2-Pack. For an ExpressLRS control link with a long-range FPV focus, choose the RadioMaster RP3 V2 ExpressLRS Receiver. The $71.50 spread reinforces the main takeaway: compare purpose before price because these components solve different jobs.
