4.20V maximum voltage and 2.5V cut-off voltage, Standard Continuous Charging Current: 220mA, Typical Capacity: 1150mAh, Maximum Continuous Discharging Current: 10A, Maximum Continuous Charging Current: 1.1A, Minimum Capacity: 1100mAh, Normal Voltage: 3.7V.
Go down and check coupons out. Remember to check price history if it is available. What is the 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. Hmmm… There is no active coupon in Banggood at this moment.
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): e2bcea, CMB3, BCNLXK, BGBFCR41, fInbG2020, BGff2020, BGAFF10OFF, BGCuponation10, 4BLF, BGHONEY2110, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BGFLBA, BANGGOODSD, BGTorch4
(there’s a little possibility that old coupon will work)
Price history and price alert
Do you need price history chart (for all/most countries) for 2x Keeppower P1835C2 IMR18350 1200mAh 3.7V 10A Battery With Box? There we go. The lowest price was: $8.88.
Price records source(s): 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)).