Check coupons or create price alert down below. Do you want to know what the best price is?
Battery: 3.7V 150mAh 20C, 5 pcs., Charging time: 30-40mins
Aliexpress
There’re some similar (or not) items on Aliexpress
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.
Link: Banggood product page
1. ($12.62): AFfbG10
2. ($13.04): aff7off
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): rchobbies8, TTxBG10, e2bcea, 502C6B, BGJJRC10, BGBFAFF2019, BGCITYADS2019, BGVDay10%off
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for 5x 3.7V 150mAh 20C RC Battery and Cable is here.
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)).