Lifespan 3, Peak Current 500A, Capacity 13, Power Indicator Light Included(5 grades), Engine Starting Times 20~30 times, 19V/3.5A, 800mAh, Working Temperature -30℃~+70℃, 000 times, 12V/10A, Input 15V/1A, Weight 420g, 4~5h(5V/2A), Full Charging Time 2.5~3.5h(15V/1A), Start Current 250A, Brand CARKU(from Xiaomi Youpin), Material ABS, Protection 8 protections, Output 5V/2.1A, Size 160*75*28mm, LED Flash Light Included.
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.
Updated:
Banggood
Warehouse in China.
Link: Xiaomi CARKU Car Jump Starter 13800mAh
$56.15 with coupon: BGCARKU11
$63.35 with coupon: BgAuMotor
Additional Banggood coupons:
1. First page
2. Second page
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi CARKU Car Jump Starter 13800mAh. The lowest price was: $56.15.
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)).