I've had this Tinyhawk II (not freestyle) and the batteries since May 2021.  The batteries are RDQ 450Mah 80C 1S.

The batteries appear to charge normally and hold their charge.  They will read between 4.1 - 4.2V when I arm and then as soon as I'm airborne the batts drop down to 3.5V and within 20 seconds I'm getting readings from 3.2 - 3.4.  It also feels like I'm having to push the throttle much more to get the thing in the air.  Then as soon as I land the battery bounces way back up to 3.9v - 4.1V.  All 12 of my batteries do essentially the same thing.

I've checked the motors and props for anything entangled and it's clear.

Also... one of the motors frequently sputters upon arming, but then seems to run normally with the throttle up. 

Since I purchased all the batteries at the same time I suppose it's possible they could all be going at the same time, but I also have a TH2 Freestyle and I use the same batteries and am not getting the dramatically reduced flight times on that (but that's also using 2 cells.)

I don't want to keep torturing my batteries if it's the quad?  


I suppose I could get some new batts and see if that solves my problem, but thought I'd ask here and see if anyone had any advice.  : )

Thanks in advance for your knowledge and help!

Sam

1S lipos do suffer from voltage sag and unless you take care of them they can deteriorate in performance very soon.

How are your props and motors? Bent? Noisy motors?

I only got 50 charges on 1s 450mah and 25 charges on 1s 300mah and they are unflyable any more. Bought some Bonka 2s hv 450 mAh but only charge them to 8.4v (4.2v/cell) for my TH2 FS and I like them, hope they last. But I do realize batteries are disposable in the 1s sizes and maybe 2s too.

Yes how “old” are the batteries? Not just she but how much have u been flying them?charges? And how (here is an important part) do u store them?
My wife uses these quads in her classroom and the kids beat and abuse and discharge the batteries past their limit.. and trust me, they do not last very long..
Yes, unless u set up ur lipo to “storage “ for 1s .. they are being abused just by leaving them..
Get some fresh lipos.. 350s-450s I’ve even flown 550s in my tiny hawks.. Fly it , learn , nothing u can’t do to that Lilly quad that can’t be upgraded. Noticed I didn’t say “replaced”…

Ok, that helps everyone! Thank you. I'll pick up a few new batts and see if that helps!

I do take care of them (don't go below 3.4 and always store them at 3.8) but I have always charged them to 4.35. They are HV, but I only just learned that even those are best charged to 4.2. Ive probably gotten somewhere around 50-75 cycles out of them.

Thank you!!
Sam

I no longer charge any lipos to HV. Just standard 4.2v.

I puffed up my first set of 1S HV lipos within the first 2 or 3 months charging them at HV and then stopped.

Had the same problem, eventually all my 1s batts for my TH2 started sagging that way, but when I got a moblite7 most of them were fine (?!) so I replaced the battery lead on my TH2 and (for me) it now works better than ever...

This one worked for me: https://newbeedrone.com/collections/all/...ttery-lead

Most of my 1s batts flew well over 50 times... I'm careful with them, don't discharge them too much (follower of the Nick Burns "rests at 3.5v on stop" philosophy) and always store them at 3.85v.  I do, however, often charge them to HV (4.35v) haven't really had a problem with that.

Strangely enough, my Tattu RLine 1s 500mah batteries never sagged (even before the "operation") maybe the pins made a more solid contact with those, dunno... PH2.0 is finicky...

Well, I have to say it does seem odd that when I fly two of the same 1s batts on my TH Freestyle, I'm still getting roughly the same flight times as when they were new? It's a mystery.

A new battery lead may be on the list. : )

I have new batts on the way, so I'll report back!

The sputtering motor might mean youhave a FET half shorting.

Does your charger show battery resistance?
Best way to test batteries is find somebody with a quad.

Its very unlikely all 12 batteries would be VERY BAD at same time.

The Tinyhawk “motor sputtering” is one of the biggest flaws.. yes, it appears to be a failed fet, but most of the time it’s just a loose motor plug… this was a big FLAW, and caused major problems.. after direct soldering all my wife’s THs motors.. havnt had a “motor stuttering” issue surface.
You can bend the plug pins to get better contact to “confirm”… but to eliminate it surfacing, direct solder.. this can be very difficult if u have a older FC.. they only had the motor pads on one side…the newer FCs , the pads were on top and bottom making it a lot easier