How to make a homemade usb power cable for MJX F29 RC helicopter?

Question

Electronics

The native wire was lost, waiting from China ru.aliexpress.com/item/MJX-F29-rc-helicopter-spare... for a long time, but I really want to fly :(
I was puzzled by the fact that usb 2.0 always gives 5B and no more than 500 mA. In the docks for the helicopter files.sotmarket.ru/instr/igrushki/mjx/mjx_f29_manu... it says that the battery is Li-polymer
3.7V 1150mAh There is a difference in current strength and voltage, although there are some "gadgets" on the original wire I don't remember.Based
on the fact that a regular usb cable has 2 cores for power inside, it is theoretically possible to make a completely suitable cable for charging without much effort:

And actually, the question is: are my guesses correct?
PS on the seller's website www.brrc.ru /catalog/production/dlya_nachinayushchi...slightly different information about the battery is given: 7.4V, 1500mAh
PPS The photo shows the battery, as well as the connector (immediately under the black and red wire)

Answer 1

I may be wrong, but 3.7V LiPo has a maximum allowable charging voltage of 4.2 (4.22) V. In addition, when charging several cells, balancing is a must. In short, it’s hard to say anything without a diagram, but a direct connection to USB can very well end up with swollen / exploded batteries and / or a dead USB.
PS By the appearance of the wire, it looks like the "gadgets" are built right into the USB plug.
PPS 7.4 / 3.7 = 2 (elements)