Lumia 800 battery life to be improved

Just found this quote from Nokia Support on the WMPoweruser web site addressing the reported issues with the Lumia 800 battery life.

Lumia 800 battery life to be improved“We understand that some people have expressed concerns about battery life on the Nokia Lumia 800.  Early investigations show that most people are enjoying the full Nokia Lumia experience without any problems and we have not been able to identify a single root cause that would lead to erratic battery behavior at this stage.  A software update in early December will make some improvements to power efficiency, while a second update in early January introduces high voltage charging, increasing the Nokia Lumia 800’s battery power from 1300mAh to 1450mAh. These are scheduled improvements and will enhance the overall experience, but are not designed to address any issues that may be occurring with individual products.  We recommend that anyone who has concerns contact local Nokia care representatives at their earliest convenience.”

It will be interesting to see how much difference this makes.

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  • You can’t tweak the capacity of a battery by changing its charge voltage without lowering its lifetime :
    – Nominal charge voltage for Li-Ion is 4.2v,
    – If you charge under this voltage, you’ll get less capacity from the battery but will get more charge cycles. Numbers : at 4,1v you get ~10% less energy but extend the battery life by ~2.
    – If you charge over this voltage, you’ll get more capacity from the battery but will get less cycles. Numbers : at 4,3v you get ~6% more energy but reduce the battery life by ~4.
    – Though, whatever the voltage you choose, during the charging operation you should not vary more from +/-0,05v around the chosen voltage. Fluctuation could damage the battery.
    In certain conditions Li-ion battery technology is rather hazardous. To some extent you could even explode it (in general because of hotness).

    If you are interested in the subject, I’ll suggest you to read the paper written by Khosrow Khy Vijeh (see… or this one… .