Aliexpress
Click here… to search for Hubsan H117S Zino RC Battery 11.4V 3000mAh on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (41.30 USD): BGHONEY2110
Coupon (42.22 USD): BGDAVIS
(CouponsFromChina.com tip: you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Old coupons (from the oldest to the newest): BGH117SBAT, AFfbG10, affbg10, 502C6B, BGBFAFF2019, BGCITYADS2019, BGVDay10%off, BGTT10, bGhOnEy10, BGdragonBoat, BgcLuBofErtA10, BGAFF10OFF
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for Hubsan H117S Zino RC Battery 11.4V 3000mAh is here.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).