As far as the battery, from what I understand about LiOn batteries is they have a certain number of charge cycles for life span. I don't think all LiOn's are the same but they should be right around 200 charge cycles. I am not a hardware expert but thats what I got from the studying I have done.
I think the average is about 400 times for a LIon battery as I recall.
Also never fully deplete the battery unless it is for a short time.
A LIon battery will not last long when fully discharged. Also, never let the voltage go below 3V or it can be damaged. I have not taken a volt meter to my BB battery yet though when it is below 40% so I am not sure how much power there is at that point.
Anyhow, LIon batteries do not last long, they have a shelf life of about 1 - 1.5 years before you need to throw them out. So never buy extras unless you really need them because they don't last long.
I recommend using QuickPull daily. It has a schedule feature -- I have mine set to run at 1:00 am nightly, just like queuing up back ups and other maintenance for your PC or Mac. My Bold is on 24/7. I don't think it hurts anything for it to be on all the time.
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