Smiling Shark SD1023 Battery Change 2600mah

I'm not happy with the original battery that came with it. after an hour of use, the light looks dim. so I decided to open it and change the battery from one of those that I salvage from my Xiaomi Qicycle.
For those who are wondering how I remove the Head Part.
I used an expired Credit card. cut them down to desired width and length.
then make one side thinner (by sanding it) and use it as prying tool.
you need 2 of them on both side at once.
Once you successfully inserted both. you can easily take the head out.

[@phucthinhnguyen5633]

How you could disassembly the light?

[@stevenknight95]

can i just buy any 2600mah 3.7v battery to replace? i have one already with wire but a clip.

[@ChibiKeruchan]

it doesn't need to be 2600mah as long as it is 3.7v rated 18650 size battery will do.
2600mah capacity will make it last longer.
I tested the original battery inside the flashlight using Litokala and it is only 700mah.

[@stevenknight95]

@@ChibiKeruchan how the charger inside the torch light charge the 18650?