You can get 1S HV 4.35V for 22.99 USD using coupon code (in Banggood). Just check coupons out (with price alert and history). Do you want to know what the best price is?
Latest price update (UTC time):
Banggood (22.99 USD)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. Low/high price? Hmmm, price is higher than average (which is 19.71 USD right now), so better set price alert down below…
Link: Banggood product page
Price: 22.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGe618d1, 8wEbgaInS5, BG8RCToy, BGToys1, BGRCParts8, Cuponation9, 9OFFSUMMER, BGMatt2022, BG71361c, BGToys8
(probably won’t work, but you can try them out)
Aliexpress
Click here… to search for 5 pcs. URUAV 3.8V 550mAh 80C/160C 1S HV 4.35V PH2.0 RC Battery on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for 5 pcs. URUAV 3.8V 550mAh 80C/160C 1S HV 4.35V PH2.0 RC Battery.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).