Aliexpress
Click here… to search for Xiaomi FIMI A3 2Pcs 11.1V 2000 mAh 3S RC Battery [EU] on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
. There’s only 1 record in my database, so I have no idea if the price is OK. We have found one coupon for this product!
Link: Banggood product page
Coupon (76.49 USD): BGAFF10OFF
(CouponsFromChina.com tip: you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Price history and price alert
Well, you won’t see price history chart, coz we have only 1 database record for this item (and price was 76.49 USD).
You can set price alert (for Banggood).