Ricoh has launched single cell Li-Ion battery protection ICs in a Wafer Level Chip Scaled Package (WLCSP). They are especially designed for use in rechargeable smart watches, hearing aid instruments, fitness trackers, wireless earbuds and other small portable devices. Wearable devices incorporate a small rechargeable Li-Ion battery with a capacity in the range from 50 ...
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from Electronics Weekly https://www.electronicsweekly.com/news/business/li-ion-battery-ics-wlcsp-2018-10/
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