Size L149mmx W115mm X H35mm, Operating Temperature 0-40°C, Cut-Off Current ≤120mA, weight 212g, Input QC3.0(5V =3A/9V=2A), Cut-Off Voltage 4.2土0.05V/1.45+0.1V, Constant Current 3Ax1/2Ax2/1Ax4/0.5Ax4.
Just check coupons out (with price alert and history). Best price?
Aliexpress
I could not find it on Aliexpress. 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. Coupons for XTAR VC4S 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!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): 4BLF, BGHONEY2110, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BANGGOODSD, BGTorch4
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for XTAR VC4S Battery Charger. The lowest price was: $31.36.
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)).