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Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Lithium Battery, CE, Model FBC122406D, Compliant standards CB, Net Weight 470g, Output Volt under No Load 27.6V, Output voltage 12V/ 24V Auto, For Battery Range 6Ah -120Ah, Input Power under No Load 2.8W, Type Smart&Automatic, Thermal protect 65°C+/-5°C, GEL, Lead-Acid(AGM, Efficiency ＞85%, SLA, IEC60335, Minimum start voltage >7.0V, Output Current 12V 6A & 24V 3A, Input Power With Load Max.110W, EN55014, 50-60Hz, LiFePO4 Battery, EN61000, Cooling Fan, DEEP CYCLE…), AC Input 100V-240V AC, WET
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($38.80): BGdcbfa8
2. ($45.59): BG00c906
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): BGFOX721, BGAutos, bGhOnEy10, BGCARELEC, BGME11, BGAFF10OFF, BGCuponation10, 13f142, BGHONEY2110, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BANGGOODSD, BGMOTO478, ADMITAD2212, 2022ACTIESNL, Tabby20, 2203ActiesNL, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204, BG3a78dd
(there’s a little possibility that old coupon will work)
Price history and price alert
Here is price history (for all/most countries) for FOXSUR 12V 24V Car Battery Charger.
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)).