I see a lot of variation in my small fleet of 65mm whoops with new LiHV 300 mAh batteries, some PH2.0 and some BT2.0.  This is flying outdoors in calm winds with gentle flying in Angle mode.  I watch the current draw in the OSD and land when it says LAND NOW.  All the motors and props are stock.  Tunes are stock but I reduced the centers and added some expo to the pitch and roll and throttle.  I changed the battery connectors on the #2 AcroBee65 and the Mobeetle6 from PH2.0 to BT2.0.  All are running ELRS 3 and packet rates of straight 250 Hz.

My #1 AcroBee65 BLV4 with PH2.0 connector and stock 3-blade props draws a consistent 11-ish amps and gives just over 1 minute of flight time. Weight with battery: 32 g.

My #2 AcroBee65 BLV4 with BT2.0 connector and stock 3-blade props draws the same 11-ish amps and gives about 1.2 minutes of flight time.  Weight with battery: 34 g.

My Mobeetle6 with BT2.0 connector and stock 2-blade props draws 3-4 amps and gives a whopping 4 minutes of flight time.  Weight with battery: 25g.  The winner.

My Meteor65 Pro 2022 with BT2.0 connector and stock 3-blade props draws 11-ish amps and gives about 1.5 minutes of flight time.  Weight with battery: 32 g.

Weight is a big factor.  Shouldn't be much of a surprise.  However, it certainly is not linear.  It takes approx 3x the current draw to fly a 32 g bird over a 25 g bird.  Yes, the BT2.0 performs better than the PH2.0 as others have also reported.

I also suspect variation in battery performance.  I use the VIFLY Whoopstor v3 charger for both PH2.0 and BT2.0.

Does anybody know of a folded ~400 mAh LiHV with BT2.0 that is longer than 300 mAh but will still fit into a 65mm frame slot?

bt2.0 is only benefical on a high current.
to complete to comparison, try a ph2.0 with solid pins on the mobeetle6 ;-) you might get more flighttime as ph2.0 wont go innefficiency on that current ;-)

I only recently built my first 2".
I have couple 2.5" but mostly 3" and 4".

Weight makes HUGE HUGE difference.
Switch to plastic screws, and lighter camera to save 4g, and 35g drone becomes 31g.

Goes from slow cement truck to hot rod.

I know 65mm whoops do not get the greatest flight time, but under two minutes seems pretty bad to me. I won't fly anything that gets less than 4 to 5 minutes flight time. My Mobula7 gets around 6 to 7 minutes flight time on a 650mAh battery.

Do you know what the battery voltage warning levels are set to in Betaflight? For my 1S whoops, I usually have the regular warning at about 3.3 volts and the "land now" set to 3.0 volts. With a 1S battery, after you disarm, the battery voltage starts climbing for a little bit and as long as it creeps back up to about 3.5 volts, the battery should stay in good shape.

The largest battery I could find to fit in a 65mm whoop frame is this one (it is a PH2.0 and not a BT2.0).
https://www.racedayquads.com/products/10...s%20380mah

I consider the VIFLY Whoopstor v3 charger, the best charger for 1S batteries as it is the only one I found that will storage charge 1S batteries... I have a boatload of bloated 1S batteries from not being stored at the proper voltage.

I was just talking about short 1s flight times with mstc. I have been averaging 1 minute of flight on all of my 1s craft. Admittedly I'm landing at 3.3 or 3.4, so maybe I could juice out another 20 seconds, but I don't think I could get 3 or 4 minutes if my life depended on it

(05-Nov-2023, 12:54 PM)FPVme Wrote: I was just talking about short 1s flight times with mstc. I have been averaging 1 minute of flight on all of my 1s craft.  Admittedly I'm landing at 3.3 or 3.4, so maybe I could juice out another 20 seconds, but I don't think I could get 3 or 4 minutes if my life depended on it

That is definitely not normal. We will have to do a whoop session and we can swap some batteries/whoops and see whats going on. All motors props spin freely, no hair wrapped around, bottom of motors clean of debris...
Maybe if you're continuously trippy spinning then yeah that might drain your pack in a minute 

(05-Nov-2023, 03:45 PM)mstc Wrote: Maybe if you're continuously trippy spinning then yeah that might drain your pack in a minute 

Well it's definitely not my high speed acrobatics haha.
Maybe we can do a few analog flights together so you can watch my battery usage. That's one of the reasons I've loved the 3s 75mm whoop so much, more flight time and more powah! But if I could eek 4 min out of a 1s, that would be game changing.

It's definitely doable. I can get 4 mins on the Meteor75 I built last year, running 1102 18000kv motors. Couldn't tell you the weight, but it was basically a Meteor75 frame, BetaFPV 5A AIO w/ BT2.0, and stock BetaFPV VTX and Caddx Ant nano. That was on those (shite) BetaFPV 1S 300mAh packs, so on a better quality pack, it might have done more. FTR, that was easy flying with a touch of light acro (rolls, flips, loops, etc) and being real easy with the throttle, so no punch outs, just real smooth.

Getting longer times is more about throttle control and the quality of the packs you use, plus lighter weight helps a lot. But if I go hardcore acro, then 2-3 mins is about my limit. For me though I don't fly 1S much any more. 2S is the bare minimum I will fly now. I like the power and thrust too much. But 1S whoops have their place.

All of my 1s PH2.0 batteries are the pillow type.

My 1s BT2.0 batteries are both pillow and folded-square. The folded-square fly longer.

I wonder whether the C rating is insufficient for the 11 amps that my AcroBee65s and Meteor65 pull.

Possibly, I know my 75 struggles on throttle punch on the BetaFPV packs, but on the Dogcom packs it handles like it should.

I think this will be due to the very high kv of the acrobee.

let it display the drawn current to check the capacity/current reading.

3-4m of flight time on Metero65 Pro in this review: 

I'm getting 3-4 minutes on my mobula6 (with additional 1g of wire soldering and connector) and 4-6:30 minutes on Meteor75 Pro.

4+ minutes on my Mobula7

Hmm, Radla's comment about kV is fascinating.

Using the same WeBleed folded-square 300 mAh BT 2.0 batteries, freshly charged:

The AcroBee65 BLV4 runs Flo 0802 27000 kV and 3-blade props, 34 g with battery.  1.3 minutes flight time.

The Meteor6 Pro 2022 runs 0802SE 19500 kV and 3-blade props, 32 g with battery.  1.5 minutes flight time.

The Mobeetle6 runs 0702SE 23000 kV and 2-blade props, 25 g with battery.  4 minutes flight time.

It still looks like the biggest factor is weight.

Are you already running Bluejay 48khz on your ESCs? I even have 96khz on a 75mm whoop. Haven't flown whoops in a while, but I seem to remember these higher PWM settings can give quite a bit of extra flight time.