Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – 2x ZNTER USB Charging 1250mAh AA Battery (-3 USD)
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (23.45 USD): BGAFF10OFF
Coupon (23.45 USD): BGTT10
Coupon (23.45 USD): bGhOnEy10
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): Charger12, AFfbG10, 0e7f33, BGHU635, BG10BC, FBCOUPON1, BGBC1, BGdragonBoat, BGRCBC7, BGSS10%SW, bgshOOp10, BGRC902
(these codes were not working in latest coupon update, but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – 2x ZNTER USB Charging 1250mAh AA Battery (-3 USD)
Price history and price alert
Here is price history (for all/most countries) for 4x ZNTER USB Charging 1250mAh AA Battery.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).