Please select Into the mobile phone version | Continue to access the computer ver.
Inspire Battery: A curious case of the weakest link.
1866 18 2015-3-17
Uploading and Loding Picture ...(0/1)
o(^-^)o
pete1144
lvl.4

United States
Offline

Curious case of the Inspire Battery: You are only as strong as your weakest cell.

The photos included in this report are pretty self-explanatory. But you'll notice that the flight started with a cell that was a bit lower than the rest. The craft flew normally for a little over 12 minutes...but when the weak cell drained below the rest into the red zone...the craft went into auto-land. This might explain why the battery seems to be fine....then suddenly it goes into critical (auto-land) mode. I think watching the battery cell condition may be an important part of flying. The main battery readout may be deceptive....until one of the cells goes into the red zone. Also notice that between the time of the last 2 photos...the charging cycle went from 9 charges to 10 charges. There were no charges. I haven't attempted to recharge the battery yet....since it is not yet at room temperature.


Batt1.jpg
Batt2.jpg
Batt3.jpg
Batt4.jpg
Batt5.jpg
2015-3-17
Use props
xzces
lvl.4
Flight distance : 81526 ft
  • >>>
Suriname
Offline

This is exactly why dji should put a warranty of at least 1 yr on their batts, this is almost certain a production error. Looks like a loose connection with that specific cell.

I sure hope limefuel starts making inspire batteries soon!
2015-3-17
Use props
CrabHawk
Second Officer
Flight distance : 7782 ft
  • >>>
United States
Offline

WOW that's crazy.
2015-3-17
Use props
pete1144
lvl.4

United States
Offline

I just recharged this same battery. It charged normally...and it says 100%...but look at the individual cells.
Newly charged_100%.jpg
2015-3-17
Use props
pete1144
lvl.4

United States
Offline

I just got this answer from DJI:
Dear pete,

Thank you for contacting DJI Technical Support.

I checked your picture and the part you concern is not the battery capacity, it is the voltage of Battery Cells.
It is normal that the voltage of Battery Cells are different.
Do all the drone function well?

Thank you for choosing DJI.

Best Regards,

DJI Product Application Technical Support

Office hours: Monday to Friday , 9:00AM to 18:00PM (HongKong Time GMT+8:00)
2015-3-18
Use props
patou72
Second Officer
Flight distance : 3316614 ft
Switzerland
Offline

Surprising.....I thought that this is exactly the thing to avoid with lipo batterys. Do they really have formed people's in the technical support or is it a problem with the language? Sometimes I think they use the google translator........
2015-3-18
Use props
rbarghini.hotma
lvl.2

United States
Offline

Your battery is clearly defective. I'd refrain from using it again and get it replaced under warranty.
2015-3-18
Use props
xzces
lvl.4
Flight distance : 81526 ft
  • >>>
Suriname
Offline

Anyone with common rc knowledge can tell you that it's defective. as soon as one cell is draining faster and can't get charged to 99% of it's capacity it is defective. And this should not happen for a very long time under normal usage. I use my rc batts 2-3 hrs a week for almost 2 years before they begin to fail! Try to get them replaced. If the cell runs out in flight it could turn off the power and you'll lose much more than just the battery (fingers crossed).
2015-3-18
Use props
pete1144
lvl.4

United States
Offline

I guess it's a matter of getting DJI to do the right thing. It seems terribly irresponsible of them.
2015-3-18
Use props
Dangair
Second Officer

Canada
Offline

pete1144@me.com Posted at 2015-3-18 23:13
I just got this answer from DJI:
Dear pete,

It's normal for a defective battery to have a weak cell. That guy is trying to sell you a bill of goods! It has a defective cell that won't balance. What a stupid thing to say!
2015-3-18
Use props
Tahoe_Ed
Captain
Flight distance : 2605 ft
  • >>>
United States
Offline

pete1144@me.com Posted at 2015-3-18 23:13
I just got this answer from DJI:
Dear pete,

Pete where are you located?  I noticed you got through to China.  
2015-3-18
Use props
pete1144
lvl.4

United States
Offline

USA..Orlando, FL. I sent an email query into the dji USA.
2015-3-18
Use props
Bob Marley
Second Officer

United States
Offline

No doubt this pack is not airworthy and should not be flown.
This pack has a bad cell, it happens, even in higher end lipo cells.
DJI should swap it out asap then establish some kind of return plan with their pack manufacturer.
One thing I can say for sure, it's bad idea to fly with a bad cell on a $100 foamy much less a 4k bird.
ANYONE who notices a bad cell on any of their packs should immediately ground the pack.
2015-3-18
Use props
pete1144
lvl.4

United States
Offline

The battery has been marked and grounded.
2015-3-19
Use props
rodger
Captain
Flight distance : 15812070 ft
  • >>>
United States
Offline

Electronics 101. The voltage moves the current that does the work.
2015-3-19
Use props
pete1144
lvl.4

United States
Offline

So here is the latest in the saga of dealing with DJI. This is from the chat line.
Sending file  Batt3.PNG
"Batt3.PNG" Sent succeeded.
Sending file  Newly charged_100%.jpg
Sent failed:uploading is unsuccessful :002
Sending file  Batt5.PNG
"Batt5.PNG" Sent succeeded.
17:03:

me:One of the cells does not fully charge. I have photos.
17:08:18
DJIk,sirYour battery is faulty
Damage of batteries
Me:Yes...we agree on that
DJIlease don't use
Me:I have put it away...then reported it to you.
17:10:04
I give you a contact information
Thank you
You contact them, change new one
That sounds very fair to me.
17:11:35
Dear Customer,
Thank you for contacting DJI Technical Support.
In order to provide you with the fastest and most effective service, our Support Team in LA is taking charge of the after-sales service for customers from North America. If you need any support concerning the product, please feel free to contact our North American regional office for help.
The contacts of our North American regional office are as follow:
Email: us.support@dji.com
Phone: +1 (818) 235 0789
Mon-Fri 9:00 am - 5:00 pm (PST)
We apologize if this change has caused any inconvenience to you and really appreciate your understanding and cooperation.
Thank you for choosing DJI.
Best Regards,
DJI Support Team
Me:So what do I do now? Call them?
2015-3-19
Use props
DJI-JS
lvl.4
Flight distance : 48940 ft
  • >>>
United States
Offline

Hi Pete,
Your email was not from US team, please note the time zone info at the signature, it listed HK time. May I ask what email address you emailed to?

As the online chat suggested, yes, please call our US center, they should be able to help you.

Thank you
2015-3-19
Use props
pete1144
lvl.4

United States
Offline

Thank you for your reply. I sent an email to US support and they returned an email. We'll see what's next.
2015-3-19
Use props
mbeyer27
lvl.2

United States
Offline

Please keep us posted, I think I am having a similar issue
2015-3-31
Use props
Advanced
You need to log in before you can reply Login | Register now

Credit Rules