Just check coupons out (with price alert and history). What is the best price?
Item Name: 6S 22.2V 1450mAh 110C Graphene Lipo Battery, Brand Name: AHTECH, Weight: 250g, Voltage: 22.2V, Model: Infinity, Output: #14 silicone-line, SY60 connector, Dimension: 29x34x118mm
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.
Link: Banggood product page
1. ($38.84): BgcLuBofErtA10
2. ($38.84): bGhOnEy10
coupon code has to be applied in shop’s 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/5cd
Old coupons (from the oldest to the newest): e2bcea, Charger12, AFfbG10, 502C6B, BGBFAFF2019, BGCITYADS2019, BGVDay10%off
(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 AHTECH Infinity 6S 22.2V 1450mAh 110C RC Battery.
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)).