Welcome Holger... why the anger? OEM DJI batteries can be had for about $100 these days. I also use third party ink & toner but I also don't spend $1000 on a printer that might crash into a tree

The propulsion system with any UAV should be the best it can be and that means buying the batteries made for it. Go ahead and save $20 if you want, I'll take it as insurance. Also if you try to get warranty repairs and you used a third party battery you are out of luck. I am still using DJI batteries that are 2 years old and they work as good as they did on day one. You just have to take care of them. A third party warranty of -$100 will not replace your crashed quad either. As far as DJI customer service goes, it has improved immensely, most repairs only taking a week in the USA. Maybe DJI doesn't make the best product for your particular needs, there are many other companies now days that make some pretty fantastic UAV's. Have you seen the new GoPro Karma?
Warranty's and insurance are a big waste of money if you never need to use them. For those that never experience an incident in which a warranty or insurance can be used - the only benefit they provide is to make a nervous person feel less nervous!
It's obvious from your post, that the thought of having to pay for a repair or replacement of your bird after a crash - is something that makes you nervous or causes you stress. So you probably fly responsibly, safely, cautiously and do everything else in your power to minimize the risk of a crash. Good for you! We should all fly that way - all the time!
Not everybody feels the same way as you though. Hopefully we all fly safely - but some of us don't believe the DJI propaganda that says their battery is better than anyone else's. We know that there are manufacturers out there that can and do make batteries that perform as well as, or better than DJI branded batteries.
We also know that claims of the entire Phantom warranty becoming void simply for flying with an aftermarket battery is false and it's nothing but fear-mongering spread by DJI representatives and under-informed DJI fans. The truth is that if you are involved in a crash and request warranty repair/replacement from DJI, they will investigate and determine the root cause of the crash. If the root cause is NOT an aftermarket component (and not pilot error), the warranty repair will be performed!
If the root cause is due to a battery failure and you are using an after-market battery, you are out of luck.
If the root cause is due to a prop spinning off and you are using after market props - you are out of luck.
BUT - If the root cause is a defective ESC or GPS module, your repair will be processed - no matter what props and what battery you are using!
The bottom line is: if the after market component is responsible for your crash, your DJI warranty is not valid - but if your after market part (whether it be props, the battery, landing gear, prop guards, etc) is NOT the root cause of the crash - your warranty is still valid.
But then there are also those of us that are no longer protected by a warranty because it's been over a year. If we believe that a particular after-market battery is better and more reliable than the DJI branded battery - we should be allowed to make that choice and use that battery. Why should DJI be able to force us to use a lower quality battery?
Here's a question I've never seen asked or answered - but let's say that I have a Phantom that is 2 years old and completely out of warranty. If I purchase a brand new battery from DJI and it fails during its second flight - will DJI replace or repair my entire Phantom - even though it's 2+ years old? Or will they simply replace the battery because it's the only component that is covered by a warranty?
In any case - *you* get a feeling that you're doing all you can to protect your investment by ensuring that your warranty remains valid - so that you're made whole financially if your battery fails. I want the same type of feeling - but mine is less about the money and more about avoiding the crash in the first place! I want to feel like I am doing all that I can to prevent my Phantom from crashing - and for me, that comes from buying a battery that I trust more than the DJI battery. You don't care as much about crashing as I do - because you know that after a crash, your bird will be replaced at no cost to you. I want to avoid the crash completely. It just so happens to be a bonus for me that I can buy a better quality battery for a lower price - and that bonus actually also serves to show how much DJI is actually gouging their customers. If an after market battery maker can produce a better quality product AND make a decent profit while selling it for considerably less than the OEM equivalent part - it highlights the greed of the OEM. DJI should have educated us on their website by dissecting their own battery and a few different aftermarket batteries and SHOWN US why their batteries are better...but they didn't (because they're not!). They implemented firmware code to reject any non-DJI battery. If the DJI batteries were truly better - this step would not have been required. This was all about capturing the most possible profit from a required commodity. If this type of business practice is not illegal (and apparently, it's not) - it should be!
But having said that - I don't want anyone to misquote me. I'm definitely NOT saying that ALL aftermarket batteries are better than DJI's OEM batteries. There are definitely some lower quality batteries out there as well.
The trick is determining which ones are "the best". Here are a few different ways one could do that:
a) find an impartial 3rd party review online
b) buy a few different ones & tear them down yourself
c) read online user reviews
d) research other batteries from the manufacturer
e) believe the propaganda from the company that sells the highest priced battery
With all those options listed together, don't you find it funny (and at the same time a bit sad or naive) how so many pilots have chosen (e) "fiercely believe the company that sells them for the highest price when they say ours are the best!"?
Warranties are not the end all and be all of drone ownership. You don't want to crash because it's expensive. I don't want to crash because I don't want to crash! I don't want to have to wait while the drone is off being fixed. I don't want to damage anyone's property. (I don't fly over people so that's not a concern), but I don't want the hassle of taking it to get repaired or the expense of owning a second one "just in case". Because of that - I want to choose to fly with the batteries I believe are best, the props I believe are best, etc!
I get it. You're happy flying with lesser quality batteries - because if/when they crash, you'll get everything fixed for free - at least until the warranty expires - and that's fine for you. You're happy paying a little extra for your batteries even if you don't realize that the "extra" covers executive bonuses and an "insurance" premium towards replacing some % of the warranty claims they know will occur. It doesn't actually mean that they are of greater quality.
You and I just have differing priorities. The only thing that's wrong with your position is if it is based on an incorrect assumption that the DJI batteries are "better" than anything else that's out there - or if you think that all other pilots will share your priorities. You should realize that what's right for you is definitely not the right choice for everybody!
"DJI batteries are best!!!" That's definitely what they want you to think - especially since they are clearly the most expensive choice - but if that were true, it would be worth it (in Marketing) for DJI to spend a few thousand dollars and commission an independent analysis of their OEM batteries against 5 of the top aftermarket batteries - and then Dwayne the results on their website. But don't hold your breath waiting for such a bake-off to occur. DJI would look horrible if such an evaluation were to really occur and they scored anything other than "first by a mile". My guess would be that they would come in a mediocre third place and that even that unimpressive 3rd place rating would only be secured due to a significant level of bribery and collusion between DJI and the reviewer (who 6 months later would suddenly appear on the payroll of DJI's marketing division!)
LOL! Ok - perhaps the last sentence is a little too cynical - but I do feel sorry for anyone that believes that the DJI OEM batteries are the best simply because DJI has stated that they are!
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