Colors: Standard Colors, Plug: XT60 Plug, Weight: About 209g, Continuous Discharge Rate: 120C, Size: 38*38*75mm, Battery Parameter: TATTU R-LINE Version 3.0 22.2V 1300mAh 120C, Capacity: 1300mAh.
Just check coupons out (with price alert and history). 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 code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($46.75): BGRCParts8
2. ($46.75): BGToys8
3. ($46.75): BG8OFFCOUPON
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BgoFErTaSchInA10, bGhOnEy10, BgcLuBofErtA10, BGAFF10OFF, BGCuponation10, BGBCSpring1, BGDAVIS, BGHONEY2110, 13f142, Parts8, BGRCBC11, BGGAL8, BGSFBC1, Tabby20, MVC8SPRING, 8BGwbg2204, pROMo8cuPoN, BG8RCToy, hoNEYbGdeAlS, BGToys1, BGRCT10, BGJUNEGSG9, DealBGimpact, Cuponation9
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – TATTU R-LINE Version 3.0 22.2V 1300mAh 120C 6S1P RC Battery [EU] ($-3)
Price history and price alert
Here is price history (for all/most countries) for TATTU R-LINE Version 3.0 22.2V 1300mAh 120C 6S1P RC Battery. The lowest price was: $33.99.
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)).