It's not my work but I came across this battery mod.

Hi there, thank you for sharing this test flight footage with the informations included with our fellow Forum users. Your contribution is highly appreciate and keep us posted always!

Who's selling the batteries?

DAFlys Posted at 10-28 05:53
Who's selling the batteries?

They aren't sold. They have replaced the cells in the old ones with bigger cells. A bit of DIY.

better accu !

A 2500mAh battery has been available on several Aliexpress shops for a week or so. Looks very hacky and kinda expensive (110-140€). But if anyone wants to try, it's there.

Helikiwi Posted at 10-28 09:01
They aren't sold. They have replaced the cells in the old ones with bigger cells. A bit of DIY.

Wow. so they make the cells themselves?

Hot damn!  Someone took my wishes and did it.  I do hope that DJI does what they do for some of their drones and offers a "plus" battery to give this little gem some more single trip flight time.

DAFlys Posted at 10-28 05:53
Who's selling the batteries?

It's stated in the video that the link is in the video description (seen from YouTube)

https://www.goofish.com/item?id=844435015686&spm=widle.12011849.copy.detail&ut_sk=1.W5ZVZ3sClWsDAORThoqAN2Kq_12431167_1729743913046.copy.detail.844435015686.673118590

I strongly suggest not voiding the warranty blablabla

actually we can put any capacity of lipo .. and reprogram the chip  and the drone will recognize the battery as the new capasity .. we can also reset the charger cycle to 0 if we want to

Who is "we"?