OK where to start.  I have a lot of quads, inc a lot of micro quads dating now back to when they first appeared.

What follows was a surprise to me, have never met this before!

Most recent pair are a Flywoo "Firefly" 1.6 V2 ELRS/HDZero, and a self build with NanoLR parts (a quad I built) put into a BetaFPV Meteor 85 frame.  This latter has a year old or so Happymodel 5in1 AIO ELRS and analogue VTX built in.

I have just after a week flying the Firefly and half a week flying the 85 managed to get delivered the Flywoo 6 way charger and four Flywoo HV 750mAh.  Until these arrived this morning I have been using GNB in both HV and std form from 530mAh to 720mAh on both being charged with a ViFly WhoopStor, all with no issues.

I checked all the four new cells, they came all on 3.86v (the checker having been checked on a calibrated accurate multimeter).

Charged them on the Flywoo charger. They came off measuring between 4.37v and 4.40v, so all over the 4.35v nominal.  MMMMMM.....................

Put one of the new Flywoo 750's on the 85. Armed, all four props jiggled, sometimes one would run, but mostly jiggling as per happens when one wire off a motor.

Put a HV GNB on the 85.................. perfect....and another....... perfect.

Put one of the new Flywoo 750's on the 85. Armed, all four props jiggled, sometimes one motor would run, but mostly jiggling.

Put a Std GNB on the 85 ................ perfect

Put one of the new Flywoo 750's on the 85. Armed, all four props jiggled on the ground.

Put one of the new Flywoo 750's on the Firefly. Armed, worked perfectly.

OK....................Voltage??  Current discharge ability??...........  


SO, I fly one of the new cells down to below std 4.20 voltage, THEN put it on the 85, and again all four props jiggled.

OK....................not Voltage then.......... so Current ability or absence of voltage sag??...........  


NONE of my GNB HV do this, all my 530/660/720 are OK on the 85.   ONLY the Flywoo 750 screws up the 85s HM ESCs, its unflyable with this cell make/type!!


The Firefly seems unaffected, and hopefully can stand the extra current, but its a worry!


The charger allowing cells to charge to 4.4v is ALSO a worry!!!

Have now charged a GNB HV on the Flywoo charger............. 4.41v !!! Highest I have ever seen on any HV charger has been 4.37v.

Do you have an A30 connector on your 85? Could it be the connector is not making solid contact and that is why your motors are not spinning up (since the same batteries have no problems on the Firefly)? That would seem more likely than a battery incompatibility since they are all 1S cells and assume with similar discharge rates.

As for the overcharging, that's terrible, but cheap 1S chargers often over/under charge.

No, its not the connectors, its the overcharging voltage coupled with the current draw of that specific FC AIO board. Its perfectly OK on GNB charged to Std or to GNB charged to 4.35v. I'm swapping batteries back and fore between the Firefly and the 85, yes, they are all A30. Only if I run the Flywoo 750's down to 4.10 or less do they then run the motors OK on the 85.

Am about to hit Flywoo up on this. (The charger is not a cheap freebie its a unit of comparable cost to the Vifly Whoopstor (which are great).

More testing, using a single Flywoo 750mAh HV.

Charged on the ViFly Whoopstor, it ended charge at 4.35v, spot on. Two cycles to prove consistent.

Charged on the Flywoo 6way, it ended 4.43v. Left overnight (somewhere safe!) it dropped back to 4.38v

Charged again, 4.46v. Left on the digital LED checker for 30 mins, dropped to 4.39v

No reply from Flywoo as yet.

Reply received from Flywoo Support. They will send another.

I have offered to return the faulty one if they supply prepaid label, or will test and report if it seems safe to use when (supposedly) strapped out to produce nominal 4.20v, which might with luck reduce it to around 4.35v.

I note there's one Chinese LiPo manufacturer starting to offer 4.4v per cell product as well as 4.35v and 4.2v.

That could so easily end in tears!