Nitecore UI2 Dual Battery Charger (Banggood, Aliexpress: Output Current 800mA (max), Weight 2.8oz, Input DC 5V/1A 5W, Dimensions L-4.82″xW-1.15″xH-1.26″, Output Voltage 4.2V±1% (the best price with coupon)).
You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. Coupons for Nitecore UI2 Dual Battery Charger? Nope, there’re no coupons 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!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGUI2, EYBG, eybg, BGTORCH, BRANDNC, bGhOnEy10, bgshOOp10, BgoFErTaSchInA10, BgcLuBofErtA10, BGFLS15, BGAFF10OFF, BGCuponation10, 4BLF, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BANGGOODSD, BGTorch4
(there’s a little possibility that old coupon will work)
Price history and price alert
Here is price history (for all/most countries) for Nitecore UI2 Dual Battery Charger. The lowest price was: $10.69.
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)).