$14.94 – Discharge current (4.0V/cell): approx. 450mA, Balance voltage setting range (lower limit): 2.0V-3.9V, Discharge voltage setting range (lower limit): 3.0V-4.2V, Li-Polymer/Li-Fe 2-6 Cell (standard voltage 7.4V-22.2V using divided voltage connector), Receiver battery: 1.2V-8.5V DC (Not battery type limit / but need external power 7.4V-11.1V / use JST connector), Measurable battery type and amount: , (pre-setting value 3.9V), (pre-setting value 3.3 V).
You can get 3 in 1 LCD RC Battery Discharger Balancer 2-6S for $14.94 using coupon code (in Banggood). Price history, coupons and price alert are available on this page. Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Banggood ($14.94)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. Is it expensive? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal $10.35)
Link: Banggood product page
Price: $14.94
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): 8wEbgaInS5, pROMo8cuPoN, BG00c906, Cuponation9, BG589b2e
(these coupons are old, so probably won’t work)
Aliexpress
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You can use link bot to get even lower price:
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Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for 3 in 1 LCD RC Battery Discharger Balancer 2-6S. The lowest price was: $8.99.
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)).