Operating voltage range: DC 12-18 Volts, Circuit power: Max. charge power 400W, Max. discharge power: 25W, Charge current range: 0.1-20.0A, Discharge current range: 0.1-5.0A, Current drain for balancing Li-po: 200mA/cell, NiCd/NiMH battery cell count: 1-18cells, Li-ion/Fe/Polymer cell count: 1-6cells, Pb battery voltage: 2-24V.
Check coupons or create price alert down below. You probably want to know what is the best price?
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.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($43.19): affbg10
2. ($43.19): AFfbG10
3. ($43.19): BGBFAFF2019
4. ($43.19): BGCITYADS2019
apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): SKYRC10, 12offrc, Charger12
(probably won’t work, but you can try them out)
Price history and price alert
Check out price history chart (for all/most countries) for SKYRC Extreme 400W 20A DC RC Balance Charger. The lowest price was: $39.99.
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)).