Batteries 5 months old

[AH-1G]

I purchased 8 Yuneec Typhoon Y LiPo batteries 6700mAh from Drones by Venom. They are slightly puffy and to insert them into the battery chamber of the 480H it's a bit tight.
When on a flat surface they rock a bit. Thoughts, should I continue to use these since they are only 5 months old. $1039 bucks.
Why they decided to puff up who knows? First couple of months they were ok not a bit puffy like it is now.
I have been very careful to only charge them when I know I,m going to fly within a couple of days, I also use the venom quad charger.

I finally figured out what Drone stands for by the general public and media:
Doltish reports of navigation equipment

 

[FlushVision]

I purchased 8 Yuneec Typhoon Y LiPo batteries 6700mAh from Drones by Venom. They are slightly puffy and to insert them into the battery chamber of the 480H it's a bit tight.
When on a flat surface the rock a bit. Thoughts, should I continue to use these since they are only 5 months old.
Why they decided to puff up who knows? First couple of months they were ok not a bit puffy like now.
I have been very careful to only charge them when I know I,m going to fly within a couple of days, I also use the venom quad charger.

I finally figured out what Drone stands for by the general public and media:
Doltish reports of navigation equipment

Your call, but I see a puffed battery as an unpredictable element in the system and should be treated with caution and consideration given to their disposal. I know it's painful seeing a 5 month old battery puff up but what would be more painful is seeing your aircraft going down unexpectedly, or worse, seeing your house go up in flames when it is on charge.

All but one of my flight batteries for my P2V+ are now showing signs of fatigue. But they are all at the very least 2.5 years old (some 3 years old) and none of them are puffed...they are all just coming to the end of their life. But since I think it would be difficult to replace them with new...the P2V+ was discontinued by dji over 2 years ago...that means that the P2V+ itself is coming to the end of it's life too. If I can't replace the batteries then I'll have to retire it. But I won't hesitate to retire it: I won't push it beyond the safe limits of the batteries...it just ain't worth it.

 

[CraigCam]

I have had similar experiences with venom batteries for Q500. I don’t trust them as all my 350 batteries from them also puffed prematurely. Venom quality control is questionable but they have a warranty. Did you register them?

 

[AH-1G]

I have had similar experiences with venom batteries for Q500. I don’t trust them as all my 350 batteries from them also puffed prematurely. Venom quality control is questionable but they have a warranty. Did you register them?

No, I was to lazy and threw the serial #'s away

 

[AH-1G]

I wrote to Venom and see if I could get 8 new ones. We'll see? thanks for your input gents.

 

[Photo]

I purchased 8 Yuneec Typhoon Y LiPo batteries 6700mAh from Drones by Venom. They are slightly puffy and to insert them into the battery chamber of the 480H it's a bit tight.
When on a flat surface they rock a bit. Thoughts, should I continue to use these since they are only 5 months old. $880 bucks.
Why they decided to puff up who knows? First couple of months they were ok not a bit puffy like it is now.
I have been very careful to only charge them when I know I,m going to fly within a couple of days, I also use the venom quad charger.

I finally figured out what Drone stands for by the general public and media:
Doltish reports of navigation equipment

AH, I wouldn't take of 1 inch with puffy a battery!

 

[AH-1G]

Update: Venom was very responsive they asked me to photograph the batteries for their analysis.

 

[AH-1G]

Ok, I'm being asked to check the voltage on each cell of the Venom 6700 LiPo battery. I have a voltage meter but where do I place the prongs for each cell with out blowing myself up?

 

[Steve Carr]

B-C, C-D, D-E, E-F

 

[AH-1G]

Thank you, thank you, thank you. Pizza on me!

 

[AH-1G]

So here's what I got for the 6700 mAh puffy batteries 3.52v per cell x 4 =14.08v in storage mode vs:

5700 mAh 3.95v per cell x 4 =15.8v in full charged mode.

I'm charging one of the puffy 6700's to see what voltage I get per cell.

 

[PatR]

That’s a pretty low total pack voltage. Typically the voltage increases 3/10 volt after the load is removed so if you flew to 14.30 they would have upped to 14.6 when it landed and motors spooled down. Shortly after being removed from the aircraft and cooling the voltage would have increased another half volt or so.

 

[AH-1G]

Yes I agree, When starting at full voltage capacity 16.4 volts (according to my st16 readout.) within seconds I'm down to 15.7 and flying time 12 minutes (5700 mAh)

 

[ArnhemAnt]

So here's what I got for the 6700 mAh puffy batteries 3.52v per cell x 4 =14.08v in storage mode

Storage voltages should be in the vicinity of 3.7 to 3.85v per cell. It would be handy to know what the IR is as well. Having said that, if the batteries are puffy, then it is a good sign that the IR won't be too good.

Back to battery/cell voltages.....As a general rule the cell volts at storage should be (as I have said above) 3.7 to 3.85v. At full charge, the cells should be 4.20v.

 

[SkyVidTek]

Regarding battery puffing, I have 4 original Yuneec H batteries all of which are showing a very very small hint of puffing. I keep a good log of the charge/discharge/storage history of each and the 4 batteries in order of age, have 13, 10 (11mo old), 10 & 9 (7 mo old) cycles on them respectively - always stored at 3.7v/cell right after a flight. Each battery charges up to 16.8v in about the same time, with each cell no worse than 0.1v of the others, and the flight time has not changed noticeably from new (about 16-18 min of actual flying) - Also I always land before the 14.4v point, except one flyaway & crash the #1 battery was down to 8.7v, but has recovered to normal. The small puffing started to occur fairly early on in each of them, but had not progressed.... If my batteries looked as puffed as the previous photos, I would be concerned. This is a pic of the worst one (the one that has 13 charge cycles and was overdischarged to 8.7v but has since had about 5 good flights).....

 

[AH-1G]

Ok, just recharged my puffy battery 6700 mAh. 3.96 one cell the other three cell 3.94. total of 15.78 very sad indeed.

If I were to lay a straight edge as above it would teeter totter on all the 6700"s

The original Yuneec batteries 5700 except for one did puff up. it is now in a grave site.

I also keep a log for my batteries.

The pic below is one that is in store mode #12
Battery #9 is fully charge. so you can see the issue