DJI Battery Power Transfer Device

The DJI Air 3 battery charging hub makes it possible to transfer the remaining power of 2 batteries to the third battery with the most remaining power, enabling you to fly even longer when in the field.

With this device it's possible to do the same with batteries from other drones like the Phantom 3 & 4 series, Mavic Air (2/2s), Mavic Pro (2/3) & FPV.
It's even possible to charge the batteries to 60% for storage.

A 1s (1 cell) Lipo battery is fully charged at 4.4V and 60% charged at 4.0V

You can buy a standars box:
https://vi.aliexpress.com/item/1005005776590372.html

or print one:

For the box you need:
4 pcs M3 x OD4.2 x H5.0 Heat Set Insert Nuts
4 pcs M3x10 countersink screws
https://vi.aliexpress.com/item/1005002615923810.html
https://vi.aliexpress.com/w/wholesale-m3-countersunk-screw.html

The device used is an adjustable DC-DC Buck Boost Converter:
https://vi.aliexpress.com/item/1005001658022554.html
https://vi.aliexpress.com/item/1005005779724753.html

You need 2pcs 5.5x2.5mm female DC sockets:
https://vi.aliexpress.com/item/1005004514593471.html

and

2 cables suitable for your batteries:
Phantom 4, Mavic Pro, Mavic 2, Mavic Air 2 2s, FPV:
https://www.aliexpress.com/item/1005003564917398.html
Mavic 3:
https://vi.aliexpress.com/item/1005004836952745.html
FPV:
https://vi.aliexpress.com/item/1005004717882088.html

It's also possible to charge your DJI batteries from a standard Lipo battery with an XT60 connector (print the box with additional XT60 socket hole).

XT60 Socket:
https://vi.aliexpress.com/item/1005004069868703.html