Working voltage 2.75 – 4.2V, Internal resistance less than 20 mΩ, Rechargeable time up to 500 times, Standard charge 0.3A~2A (Recommend 0.5A~1.5A), Brand Shockli, / 4.2V+/-0.05V, Name 21700 Rechargeable Battery, Protected No, Charging time 5.5 hours(Charge current 1.0A), Head type Flat top, Rechargeable battery Yes, Nominal voltage 3.7V, Capacity 4550mAh, Continuous /Max Discharge Current 22A/30A.
Check coupons or create price alert down below. What is best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGTORCH, BGdragonBoat, bGhOnEy10, bgshOOp10, BgoFErTaSchInA10, BgcLuBofErtA10, BGFLS15, BGAFF10OFF, BGCuponation10, 4BLF, BGHONEY2110, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BGFLBA, BANGGOODSD, 6GSGIT, BGTorch4, 00c906, BGtorch2, BGtorch3, BGAlerabat15, BGtorch7
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for 2Pcs Shockli 21700 Battery 4550mAh Flat top 22A 3.7V. The lowest price was: $10.96.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).