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3.6V, 3500mAh, Rechargeable 18650 Li-ion Battery
Aliexpress
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Price history and price alert
Here is price history (for all/most countries) for 4x LG MJ1 INR18650 Battery.
Price records source(s): Gearbest
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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)).