The BetaFPV 1S F4 V2.0 is an AIO flight-controller for all 1S aficionados. On paper it seems that I found my perfect flight controller for 1S builds: integrated RX, super light weight and comes with BT2.0 battery connector.
But does it live up to my expectations? Let’s find out!
DISCLAMER: This flight controller comes in at least three different versions - I ordered so early that I initially got version 2.0 - this version does not have a 5V BEC and you have to make sure that your VTX and cam can be powered directly from the battery. Version 2.1 comes with a 5V BEC, so no worries there. Also the earlier FrSky versions came with the slow MCU for the ESC’s - so no JESC and thus no RPM filtering on those. The versions currently being shipped by BetaFPV all come with 5V BEC and the BB21 MCU’s.
This AIO flight-controller super light weight - it weighs in at just 2.69g without the battery lead.
You can even get that weight down to 2.4g if you de-solder the motor plugs and solder your motor wires directly.
The flight controller includes a D16 capable SPI FrSky receiver, but there is also a DSMX, Futaba and no RX version. You also get an OSD and a spare UART for SmartAudio. The ESC’s are capable of pushing 5A continuous and 6A peak.
In the package you will also receive a BT2.0 connector with pigtail (already soldered to the flight-controller), rubber grommets and screws for mounting the flight-controller.
Before shipping the flight-controller with BetaFPV’s own battery connector they shipped it with a solid pin PH2.0 connector. Unfortunately the PH2.0 connector is not a genuine one manufactured by JST. It is rather a thin PCB with pins soldered to it and a plastic cover on top. This plastic cover is pretty loose and it kept sticking to my batteries. After around 20 packs I got a loose connection, so I decided to swap to a genuine JST PH2.0 solid pin connector - no issue since then.
If you prefer the PH2.0 connector, I would recommend getting a genuine JST one with solid pins and just swapping it for the BT2.0 connector. I am sure there will soon be a better battery selection with BetaFPV’s new BT2.0 connector, but right now you can only get BetaFPV batteries with this connector pre-installed, which are - to be honest - not the best.
The pads for connecting your cam and VTX are pretty tiny, but they are placed on the outside of the PCB and are thus relatively easily accessible - still this might not be the right board if you don’t have a lot soldering experience.
I was pretty surprised to see the flight-controller shipped with Betaflight version 3.5.7. After dumping the settings just to be on the save side I installed a more up to date version: 4.1.1. Unfortunately I was not able to get a decent tune with 4.1.1 - During flight it seemed like the ESC’s were de-syncing for the fraction of a second. No matter what I did, I could not get rid of that behavior. With DSHOT600 and an 8k/8k loop I was not able to fly at all - 2 of the motors would stop spinning after a couple of seconds. I reverted back to 3.5.7 and had none of those issues. Maybe this is also just a problem of my 2.0 version - I am really curious if any one else experiences these issues.
All of this seems to be fixed with the latest revision of the board with the BB21 MCU’s - no issues running Betaflight 4.1.1 with RPM filters.
If you are going for a light-weight 65mm build, I can highly recommend this flight controller. If you are careful with picking your parts it is now easily (without any hardcore modifications) possible to build a 1S brushless whoop that weighs just under 20g without a battery.
The possibility of running RPM filters is a massive plus, especially in this size.
When buing the flight-controller from a different source than BetaFPV, make sure you are getting the version with BB21 MCU’s - especially when buying the FrSky version - all other version should come with the better MCU anyways.
The shape of the flight-controller is borrowed from the AlienWhoop brushed board and allows to save quite a significant amount of PCB and thus weight.
Seeing this board layout I wonder how much more space can be saved, keeping the same feature set - maybe BetaFPV managed to reach the limit here?
The price of $ 39.99 is in my opinion pretty fair for what you are getting and you can buy it directly from the BetaFPV website
Maybe next time?
What I would really like to see is a version without pre-soldered motor plugs and power cable, but they are pretty accessible so you can de-solder them easily yourself. Other than that, I have not really any complaints.