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bq20z45-R1

Hello,

NR stands for Non Removable. But what does it mean?
Does it mean a battery that is non-removable?
How is it implemented?
What is the difference between [NR] and [PRES]?
PRES means a battry pack has been inserted.
If so, whay having two parameters?

To save power,
Is it better to put 20z45 in sleep or shutdown?

Thank you,

RK