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No cell protection or charging control is present

Cheap solar lights lack charging management, allowing 6 V panels to overcharge Li-Ion 18650 cells while NiMH cells naturally throttle current.

Field
hardware and chips
What they did
Researchers found that an outdoor solar light contained an unprotected 18650 Li-ion battery without a charging management system, leading to over-discharge.
Why it matters
This is dangerous because Li-ion batteries cannot automatically limit charging current like NiMH batteries, which increases the risk of fire.
#li-ion#safety#solar power#battery management

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