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http://flashlightwiki.com/Rechargeable

1. – Lithium Manganese .

NOTE: These batteries are NOT recommended for (low-drain devices). They are design for high-drain devices (i.e. VAPING PRODUCTS). High capacity 40A 3.7V high drain flat top li-ion batteries are perfect for those who demand high-current discharge performance…

https://en.wikipedia.org/wiki/Rechargeable_battery

https://en.wikipedia.org/wiki/Rechargeable_alkaline_battery

Amazon.com: Anker Super Bright Tactical Flashlight …