I have checked all old coupons and price is 36.79 USD for 2S 7.4V 6200mAh (in Banggood). Just check coupons out (with price alert and history). You probably want to know what is the best price?
Latest coupon and price update (UTC):
Banggood (36.79 USD)
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood. Is it good price? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal 33.96 USD)
Link: Banggood product page
Price: 36.79 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGToys8, BGMatt2022, BG589b2e
(there’s a little possibility that old coupon will work)
Aliexpress
Click here… to search for Radiomaster 2S 7.4V 6200mAh RC Battery JST-XH XT30 on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for Radiomaster 2S 7.4V 6200mAh RC Battery JST-XH XT30.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).