Through hole diameter: 3.0mm, Type: With battery / without battery (optional), Output voltage: 5V, Product size: 65mm × 30mm, Applicable battery: 3.7V 14500 lithium battery (full charge is 4.2V).
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Aliexpress
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Banggood
Banggood warehouse is located in China. There is one coupon right now! Check this out.
Link: Banggood product page
1. ($29.10): BG2589f4
apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Price history and price alert
Do you need price history chart (for all/most countries) for Catda Raspberry Pi 4B Battery Expansion Board 5V? There we go. The lowest price was: $29.1.
Price records source(s): Banggood
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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)).