4pcs AAA ICR 10440 Rechargeable Lithium Ion Battery ,3.7v 350mah

Maybe the most powerful keychain flashlight. 4 modes with hidden strobe. Best performance. Rechargeable 10440 battery.

【EASY TO USE】 Exclusive stainless steel side button switch provides convenient one-handed operation. The switch will never wear off in any harsh environment.
【MICRO SIZE】 UltraTac K18 Mini LED keychain light measures 1.61 inches in length with a body diameter of 0.51 inches. K18 Mini is an invaluable tool that can keep with you all of the time.
【INCREDIBLE BRIGHTNESS】 This nano flashlight provides up to 130 lumens output, it can be a powerful tool when you are walking around at night. And the strobe function is great for self-defense.
【DURABLE & RELIABLE】 With IPX-8 waterproof and 1.5m impact resistant design. UltraTac K18 Mini keychain flashlight remain working if you’re trudging in the rain or tripping into pools of water.
【USB RECHARGEABLE】 As an economical and practical EDC flashlight, UltraTac K18 Mini come with a 10180 Li-ion rechargeable battery and a USB charger, you can charge the battery by using the Micro USB cord in the package.
【EASY TO USE】 Exclusive stainless steel side button switch provides convenient one-handed operation. The switch will never wear off in any harsh environment.
【MICRO SIZE】 UltraTac K18 Mini LED keychain light measures 1.61 inches in length with a body diameter of 0.51 inches. K18 Mini is an invaluable tool that can keep with you all of the time.
【INCREDIBLE BRIGHTNESS】 This nano flashlight provides up to 130 lumens output, it can be a powerful tool when you are walking around at night. And the strobe function is great for self-defense.
【DURABLE & RELIABLE】 With IPX-8 waterproof and 1.5m impact resistant design. UltraTac K18 Mini keychain flashlight remain working if you’re trudging in the rain or tripping into pools of water.
【USB RECHARGEABLE】 As an economical and practical EDC flashlight, UltraTac K18 Mini come with a 10180 Li-ion rechargeable battery and a USB charger, you can charge the battery by using the Micro USB cord in the package.

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UltraTac K18 Mini Keychain Flashlight, 130 Lumen Waterproof Cree LED Keyring Light with Side Button Switch Including 10180 Rechargeable Battery and Micro USB Cable (K18 Black with Charger);