DISCHARGE RATE 100C CONTINUAL / 200C BURST, VOLTAGE 22.2V / 6-CELL / 6S1P, OUTPUT CONNECTOR XT60, REMARKS N/A, CAPACITY 1300MAH, BALANCE CONNECTOR JST / XH, SIZE 47X35X76MM, WEIGHT 230G (INCLUDING WIRE AND CONNECTOR), STOCK NUMBER 1301006BK, CHARGE RATE 5C MAX.
Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
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. You can get coupon down below.
Link: Banggood product page
1. ($53.35): BGMatt2022
coupon code has to be applied in shop’s cart 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): BGPL6LIPCA11, Cuponation9, COUPONSDE1wk, BGGutscheine, BGToys8
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for 2Pcs CNHL Black 1300mah 22.2V 6S 100C RC Battery XT60. The lowest price was: $52.77.
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)).