Best Flashlight Batteries? LBF 18650 & 21700 Tested!#

Best Flashlight Batteries? LBF 18650 & 21700 Tested!

Today, I’m testing the LBF 18650 (3200mAh) & LBF 21700 (5000mAh) 3.7V Li-ion cells to see if they’re suitable for flashlights and if their built-in USB-C charging & powerbank features perform as advertised.

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Key Features#

• Built-in USB-C charging (5V/2A)
• Built-in USB-C powerbank (5V/2A)
• Protection circuit for safety

Tests Performed#

• Capacity Test - Discharge at 1A with an Atorch DL24 (cut-off: 2.5V)
• Internal Resistance - Measured with a FNIRSI HRM-10
• Charging Graphs - Logged with ChargerLabs Power-Z KM003C USB Meter
• Powerbank Test - Rapid phone charging via USB-C to USB-C
• Flashlight Compatibility - Tested in various 18650 & 21700 flashlights

Tools Used (Affiliate Links)#

• Atorch DL24 Electronic Load
• FNIRSI HRM-10
• ChargerLabs Power-Z KM003C USB Meter

Flashlights That Worked#

18650 Flashlights#

• NEXTORCH TA30C
• Acebeam T35
• Acebeam P16 Defender
• Convoy S2+

21700 Flashlights#

• Weltool W4 Pro
• Convoy L21B
• Skilhunt EC500
• Acebeam E75
• Cyansky P25 V2

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