Temperature: 5-40℃, Limited Voltage: 8.8V, Voltage: 7.7V, Energy: 17.32Wh, Capacity: 2250mAh, Weight: 86g, Type: Lipo 2S.
Basically copy coupon, view price history or create e-mail price alert. 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 price update (UTC time):
Banggood
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.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGquadpart, BGa756f0, BG9d786a, BG1b33df, BGff1a9f, BGd0a736, BG8afaa6, BG6f120d, Cuponation9, BGMatt2022, BGToys8, BGGutscheine, BG8OFFCOUPON, TTBLACK5, BG589b2e, BGAUGUST8, BGCAPITALOS8, BGCOUPERT8, BGCOUPERTBF8
(there’s a little possibility that old coupon will work)
Other warehouses/versions
This item is available in 2 another warehouse/versions!
1. Europe – FIMI X8 Mini RC Battery Standard 7.7V 2250mAh 2S [EU] ($-3)
2. Europe – FIMI X8 Mini RC Battery PRO 7.2V 2400mAh 2S [EU] ($-3)
Price history and price alert
Price history (for all/most countries) for FIMI X8 Mini Original RC Battery 7.2V 3100mAh 2S is here. The lowest price was: $49.4.
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)).