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Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (16.14 USD): BGAlerabat15
Coupon (17.09 USD): BGtorch2
(CouponsFromChina.com tip: apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop)
Old coupons (from the oldest to the newest): 00c906, BGtorch3
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for XTAR 5000mAh 3.6V 10A 21700 Battery Button Top.
Price records source(s): Banggood
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