When I was updating this page the price was $6.99 for 12V/24V/36V/48V 8-70V LCD Battery Capacity Indicator (in Banggood). You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
Display: Power / Voltage / Close / the key for cycle.
Latest coupon and price update (UTC):
Banggood ($6.99)
Banggood warehouse is located in China. CouponsFromChina software could not find any coupon for this product in Banggood. I think you want to know if the price is good. This price is higher than average price ($5.04) for this item.
Link: Banggood product page
Price: $6.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): 00c906, BG00c906, ADMITAD2212, 2022ACTIESNL, Terence, Tabby20, 2203ActiesNL, BG1efeb0, 8Couponsde, MVC8SPRING, BGJUNEGSG9, Cuponation9, 9OFFSUMMER, BG589b2e
(probably won’t work, but you can try them out)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for 12V/24V/36V/48V 8-70V LCD Battery Capacity Indicator.
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)).