September 21, 2009
about 2 years ago
After looking at the datasheet, it appears that this chip does not turn the charging voltage off after charging is complete. According to the following article:
“Li-ion cannot absorb overcharge, and when fully charged the charge current must be cut off. A continuous trickle charge would cause plating of metallic lithium, and this could compromise safety. To minimize stress, keep the lithium-ion battery at the 4.20V/cell peak voltage as short a time as possible.
Once the charge is terminated, the battery voltage begins to drop, and this eases the voltage stress. Over time, the open-circuit voltage will settle to between 3.60 and 3.90V/cell."
I’m thinking a dime might have been a better choice for scale.
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