date and GPS related questions

[Fernando Martins]

Joerg Reisenweber wrote:
> Am So  15. März 2009 schrieb Fernando Martins:
>   
>> Daniel, many thanks for your replies, please see below.
>>
>> Daniel Willmann wrote:
>>     
>>> Hello,
>>>
>>> On Thu, 12 Mar 2009 22:19:05 +0100
>>> Fernando Martins <fernando at cmartins.nl> wrote:
>>>
>>>   
>>> there is a backup battery, but in my experience it only takes a couple
>>> hours without battery until the time is lost again.
>>>
>>>   
>>>       
>> I never leave the battery out, I only take it out to reboot after a crash.
>>
>> But now I wonder: usually I keep the phone switched off during the 
>> night, and since I use it rarely, sometimes I forget it switched off at 
>> home. Is it the case that, when FR is switched off, the main battery 
>> does not feed the backup battery? (yeah it sounds weird, the main 
>> battery would become the backup of the backup battery).
>>     
>
> From PCF50633 PMU datasheet it seems backup bat isn't used as long as main 
> battery is supplying sufficient voltage, no matter whether phone switched off 
> or not.
> So backup bat is the backup for main bat, not vice versa ;-)
> /j
>   

Uff, I was getting all confused with these batteries back and forth :-)

I never let the main battery drain fully, so something else has caused 
the date to reset.

BTW, I was also curious whether the backup battery recharge itself, and 
from the datasheet above it seems to be the case.

I still remember the old times where I had to replace batteries in PC 
motherboards. Nowadays motherboards dye before the battery :-)

Regards,
Fernando