I DM'ed GNB to confirm but is that "450mah" reference at the bottom of this image for one of their lipos the mah rating if charged to normal voltage?



I have started using these lipos due to their super lightweight and high C rating.  But I normally dont charge my HV lipos to 4.35 to maintain its performance and extend its life.  But at 63g for 450mah, that's heavier than standard Tattu 4S 450mah at 58g. 

If that 450mah does indeed reflect 4.2V equivalent, then I'll throw caution to the wind and start charging these to 4.35.

On a related note, is that extra 0.15 voltage that noticeable in terms of effect on KV at the start of the pack?  More to the point, is it enough of a difference to throw off a tune?

I have been flying the GNB 3SHV-1100's for a while and rarely charge them to 4.35v, but do occasionally. It does make a difference, but whether it is worth the stress on the cells is subjective.

On my Drift, it equates to an extra 15 minutes of flight time...but that is basically a powered glider.

When used on my quads, it generally nets an extra several minutes.

yes, you will got 450mah "out" of it only! if you charge them hv to 4,35 per cell.
the voltage will be higher for the first seconds and maybe up to the first minute, the wider voltage range isnt nice for tuning...

while these cells might be nice quality and able to provide good performance, hv is a hype. choose higher cell count or a higher motorkv, prop choice does give all the benefits without the downsides of highvoltage technology.
cells with a high amount of graphene in it does provide more stable voltage, nice for tuning. pricy and more heavy


an unbalanced charge would should the the capacity in comparison between the tattu and the gnb hv packs

I heard back from GNB and it turns out what that says is that it is an upgrade version of the 450mah battery from 2 years ago LOLLLL.  So that's an oops.  
 
So hopefully charging to 4.2 will yield something closer to the stated 660mAh when charged to 4.35.

I have these GNB 660mAh battery (new, <10 cycles) , I can test it out 4.2V vs 4.35V. Give me couple hours.

(22-Jan-2022, 08:10 AM)the.ronin Wrote: I heard back from GNB and it turns out what that says is that it is an upgrade version of the 450mah battery from 2 years ago LOLLLL.  So that's an oops.  
 
So hopefully charging to 4.2 will yield something closer to the stated 660mAh when charged to 4.35.

Yea, I was going to say the 450mAh is probably an error. Chinese product info is always so unclear and riddled with errors. You’d think they would just hire an English speaker to do a quick read through of things… I’d do it for free products even.

It would be very interesting to know the performance of these batteries, I might order some for my new ultralight 5" build.

what is the capacity when charged to 4.2 volts? Do they perform good?

Lipo chemistry varies even in different batches so to benchmark will require a few packs from each manufacturer.

With Tattu packs they deliver good performance vs weight but are pricey and don’t last long.

I guess it also depends how you stress the lipos.

(25-Jan-2022, 12:32 PM)kafie1980 Wrote: Lipo chemistry varies even in different batches so to benchmark will require a few packs from each manufacturer.

With Tattu packs they deliver good performance vs weight but are pricey and don’t last long.

I guess it also depends how you stress the lipos.

I have ordered 4s tattu 550mah, weighing in at 60gram so the GNB 660mah are very tempting at 63 gram. Maybe I will order a couple to try them our

So I tested two of the GNB 660mAh batteries. The capacities are 620 & 626 mAh @4.35V, compared to 535 & 530 mAh @4.2V. The test was performed using ToolkitRC M6DAC's charger, discharging to 3.3V @ 1A. the current reading on the M6DAC is consistent with clamp meter measurement.

its not true scientific :-)

Thanks for the testing lee! I'll take 530!

My quick maths shows that's still a gain over the Tattu 450s I've been comparing to. Honestly to me, it felt more like 450 when charged to 4.2. Not gonna lie I was kinda pissed lol. But then it occured to me that I typically only fly to storage voltage 3.8 or thereabouts never really fully draining to a safe low voltage. That likely accounts for the difference.

(25-Jan-2022, 11:44 PM)the.ronin Wrote: Honestly to me, it felt more like 450 when charged to 4.2.  Not gonna lie I was kinda pissed lol.  But then it occured to me that I typically only fly to storage voltage 3.8 or thereabouts never really fully draining to a safe low voltage.  That likely accounts for the difference.

My pleasure, I was curious too!

The test was done with low discharge current @1A (somehow M6DAC charger only willing to draw that much current...). In reality, flying requires much higher current, which would induce higher voltage sag and thus reaching landing voltage faster. Perhaps this can explain the discrepancy between the test result and your actual flying experience.

Although I would have flown both the Tattus and GNBs the same way so it should be a net wash. I'm thinking the difference in my "feel" was more due to the fact that I tend to stop at 3.8 and not at say 3.5 or 3.4.

Ultimately, I would recommend these 660s. GNB also has more traditionally shaped 650s (also high C rating, 4S, xt30) but is spec'ed 7g heavier ...

(26-Jan-2022, 01:17 PM)leestrong Wrote: My pleasure, I was curious too!

The test was done with low discharge current @1A (somehow M6DAC charger only willing to draw that much current...). In reality, flying requires much higher current, which would induce higher voltage sag and thus reaching landing voltage faster. Perhaps this can explain the discrepancy between the test result and your actual flying experience.

bingo

I have the stick type Gaoneng 520mah, 540mah and 600mah. 
I did exact same charger capacity tests you did. It was long ago, so I dont have numbers, but was impressed.
However, flight time is almost same. All of them even new had like 20-25mohm, and huge sag on punches.

Normal non-HV perform MUCH bettter, and typically have 5-7mohm. This is why Bob Roogi, fpvcycle insists on non-HV, especially for the Babytooth, because on 1S, you are pulling even HIGHER amps.