LED lamp
Cheap small LED lamp with built-in rechargeable battery and gooseneck. It can be attached to surface using magnet or using spring loaded clamp.
Some parameters:
- charging current: up to 350 mA
- cut-off voltage for LiIon cell: 2.9 V; at this voltage it consumes 10 mA or 18 mA depending on the mode
- maximum voltage on LiIon cell when charging: 4.215 V; drops to 4.175 V when charged; at this voltage it consumes 60 mA or 100 mA depending on the mode
- can be turned on and charged at the same time
Overall it looks like a simple but sane and safe product.
Note: I haven't noticed at first that holding microswitch changes brightness, so actual current consumption would vary.
It required repair due to mechanical damage: torn out micro USB charging socket and broken two screw pegs.
It can use one or two 14500 cells connected in parallel.
14500 cell branded as HONGLI, no stated capacity but at least its weight is decent.
SMD LTH7 = HM4054H or LTC4054ES5-4.2 LiIon charging controller.
LED head with 3 white cold and 3 white warm LEDs, giving three light modes with 3 or 6 LEDs in use.
LED PCB has a second pair of power pads on the long side - apparently for the other variant of this lamp.
Back of LED head with mode switch. It looks like a quite new product - 2024.04.27.
These status LEDs seem like a waste (red for charging, green when charging finishes) - they would be normally not visible.
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