I have just checked coupons. The lowest price I could get is $229.99 for HANIWINNER 12.8V 54Ah LiFePO4 Battery Pack 691.2Wh [EU] (in Banggood). It is from European warehouse! Price history, coupons and price alert are available on this page. Best price?
[EU Direct] HANIWINNER 12.8V 54Ah LiFePO4 Lithium Battery Pack 691.2Wh Energy Backup Power With BMS Waterproof for Replacing Most of Backup Power RV Boats Solar Off-Grid Support in Series/Parallel HD009-07
Latest coupon and price update (UTC):
Banggood ($229.99)
Banggood warehouse is located in Europe 
. You probably want to know if this is a good price. From what I can see this price is higher than average price ($195.71). Well, there is one coupon available right now.
Link: Banggood product page
Price without coupon: $249.99
1. ($229.99): BGALL8
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): BGde6d01, BG589b2e, BGHONEYSP, BGESJY8
(these codes were not working in latest coupon update, but you can check them out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for HANIWINNER 12.8V 54Ah LiFePO4 Battery Pack 691.2Wh [EU].
Price records source(s): Banggood
Click on image to enlarge. ![Price history for HANIWINNER 12.8V 54Ah LiFePO4 Battery Pack 691.2Wh [EU]](https://couponsfromchina.com/pricehistory/History40862.png "HANIWINNER 12.8V 54Ah LiFePO4 Battery Pack 691.2Wh [EU] price history")
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)).