How to make a Makita 18V 5ah battery with my homemade spot welder (BL1850) 

Hello again ,
i make a makita battery 18V 5ah with an old case .
I bought the pcb board from aliexpress , and the 10 batteries 18650 from local shop.
The batteries are LG ICR18650-HE2 2500mAh - 20A cost 10*3,99 = 39.90$
The board cost = 6,50 &
a battery for makita 18v 5 ah original cost here 99$ half price at least!
thank you for watching my video .
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