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| The Following User Says Thank You to shadowjk For This Useful Post: | ||
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2009-10-10
, 12:12
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Posts: 299 |
Thanked: 168 times |
Joined on Jun 2006
@ Wales UK
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#52
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Originally Posted by RevdKathy
Thats exactly what you do ( although not from a eee on standby obviously
Errr You what?
Short words please! (I'm a bear of very little brain!) You charge it up from your computer via the usb, in about 5 hours. Then you plug it into your device and charge that from it - fast enough not to trickle the Li-ion battery. And being a li-ion battery itself, you can top it up after you've used it, rather than wait till it's drained. Yes?? (Or did I misread?)
And this works for a nokia tablet? Sweet!
)From the Specifications
Size: 100x62x15mm (similar to a cassette tape)
Weight: 105g
Capacity: 3400mAh (12.58Wh)
Charging efficiency > 95%
Charges in 4-5 hours
Can be recharged approx 500 times
60% pre-charged and ready to use
upto 700mA Current output
Rick
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2009-10-10
, 12:17
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Posts: 2,173 |
Thanked: 2,677 times |
Joined on Oct 2009
@ Cornwall, UK
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#53
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Thanks! I feel like I'm learning a foreign language by going straight to a new country and having to communicate there! I'm not completely dumb (well, not quite completely) but much of what is said here is going clean over my furry head. I can usually work out when something is said that might be useful to me, but often need to check I heard right!
__________________
Hi! I'm Kathy and I'm a Maemo Greeter! Welcome.
Useful links for newcomers: New members say hello , New users start here, Community subforum, Beginners' wiki page, Maemo5 101, Frequently Asked Questions (FAQ)
Did you know Meego.com has forums too?
Hi! I'm Kathy and I'm a Maemo Greeter! Welcome.
Useful links for newcomers: New members say hello , New users start here, Community subforum, Beginners' wiki page, Maemo5 101, Frequently Asked Questions (FAQ)
Did you know Meego.com has forums too?
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2009-10-10
, 12:55
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Posts: 3,404 |
Thanked: 4,474 times |
Joined on Oct 2005
@ Germany
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#54
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Heat is the biggest enemy of a battery. Unlike notebooks, the N900 doesn't get hot, so this shouldn't matter.
I'd suggest to just use the device without worrying about the battery too much. There's already fancy electronics and software installed to keep care of the battery for you.
Just use the device and be happy. I usually charge my N900 every night and then can use it the whole day without worrying.
I'd suggest to just use the device without worrying about the battery too much. There's already fancy electronics and software installed to keep care of the battery for you.
Just use the device and be happy. I usually charge my N900 every night and then can use it the whole day without worrying.
| The Following User Says Thank You to pycage For This Useful Post: | ||
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2009-10-10
, 13:26
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Posts: 521 |
Thanked: 296 times |
Joined on Sep 2009
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#55
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Originally Posted by pycage
Can you give us an idea of your daily usage. Eg.
Heat is the biggest enemy of a battery. Unlike notebooks, the N900 doesn't get hot, so this shouldn't matter.
I'd suggest to just use the device without worrying about the battery too much. There's already fancy electronics and software installed to keep care of the battery for you.
Just use the device and be happy. I usually charge my N900 every night and then can use it the whole day without worrying.
9am to 1am. How many bars left
- set to 3G
- surf web for X mins
- watch video for X mins, listen to X music
- how often does it connect to internet?
- minutes of voice calls
- ever connected to wifi
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2009-10-10
, 16:01
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Posts: 27 |
Thanked: 17 times |
Joined on Sep 2009
@ Philadelphia, USA
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#56
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Originally Posted by shadowjk
X2
Instead of having the batteries in series and dropping voltage with a linear regulator to 5V, I would have the batteries connected in parallell, and use a boost converter to bring up the voltage to 5V. This thing looks useable: http://www.dimensionengineering.com/lvboost.htm
AFAIK, A standard linear regulator usually needs a forward voltage 2-3V higher than its output to function correctly. Therefore as the batteries discharge, there is the potential a linear regulator might not be able to correctly control voltage.
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2009-10-10
, 16:09
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Posts: 3,404 |
Thanked: 4,474 times |
Joined on Oct 2005
@ Germany
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#57
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Originally Posted by bugelrex
I'd say, about 2h of playing music in the car using FM transmitter (you'd suppose this to drain the battery a lot, but it doesn't),
Can you give us an idea of your daily usage. Eg.
9am to 1am. How many bars left
about in total 15 minutes web surfing on 3G spread over the day, about 15 to 30 minutes voice calls,
sometimes taking photos.
The device is always online. WiFi at home, 2G or 3G elsewhere. I set it to connect automatically.
The battery is then usually still half full in the evening. My G1 was half full in the evening too, but only if I did not do much more than carry it around with me during the day, reading a little email.
The N900 battery only begins to drain more quickly when disabling WiFi power management for connecting to the device via ssh.
I currently don't watch lots of video on it.
__________________
Tidings - RSS and Podcast aggregator for Jolla - https://github.com/pycage/tidings
Cargo Dock - file/cloud manager for Jolla - https://github.com/pycage/cargodock
Tidings - RSS and Podcast aggregator for Jolla - https://github.com/pycage/tidings
Cargo Dock - file/cloud manager for Jolla - https://github.com/pycage/cargodock
| The Following User Says Thank You to pycage For This Useful Post: | ||
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2009-10-10
, 17:50
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Posts: 521 |
Thanked: 296 times |
Joined on Sep 2009
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#58
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Originally Posted by pycage
I'd say, about 2h of playing music in the car using FM transmitter (you'd suppose this to drain the battery a lot, but it doesn't),
about in total 15 minutes web surfing on 3G spread over the day, about 15 to 30 minutes voice calls,
sometimes taking photos.
The device is always online. WiFi at home, 2G or 3G elsewhere. I set it to connect automatically.
The battery is then usually still half full in the evening. My G1 was half full in the evening too, but only if I did not do much more than carry it around with me during the day, reading a little email.
The N900 battery only begins to drain more quickly when disabling WiFi power management for connecting to the device via ssh.
I currently don't watch lots of video on it.
Thanks very much for the clarification. It does seem liveable for most light days
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2009-10-10
, 17:54
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Posts: 3,404 |
Thanked: 4,474 times |
Joined on Oct 2005
@ Germany
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#59
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Yes, definitely. And not light days, well even the N810 didn't survive those with a single charge.
__________________
Tidings - RSS and Podcast aggregator for Jolla - https://github.com/pycage/tidings
Cargo Dock - file/cloud manager for Jolla - https://github.com/pycage/cargodock
Tidings - RSS and Podcast aggregator for Jolla - https://github.com/pycage/tidings
Cargo Dock - file/cloud manager for Jolla - https://github.com/pycage/cargodock
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2009-10-10
, 17:55
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Posts: 3,404 |
Thanked: 4,474 times |
Joined on Oct 2005
@ Germany
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#60
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I have to add that I don't have the latest firmware currently. So in the end the battery life could be even better in the sales product.
__________________
Tidings - RSS and Podcast aggregator for Jolla - https://github.com/pycage/tidings
Cargo Dock - file/cloud manager for Jolla - https://github.com/pycage/cargodock
Tidings - RSS and Podcast aggregator for Jolla - https://github.com/pycage/tidings
Cargo Dock - file/cloud manager for Jolla - https://github.com/pycage/cargodock
Protection Circuits can be found at batteryspace, for example: http://www.batteryspace.com/pcmwithe...02s20-265.aspx
Instead of having the batteries in series and dropping voltage with a linear regulator to 5V, I would have the batteries connected in parallell, and use a boost converter to bring up the voltage to 5V. This thing looks useable: http://www.dimensionengineering.com/lvboost.htm
This would do away with the balancing requirement, for connecting them in parallell you just need to make sure they're both at same level of charge before you connect them together. This would enable you to use a simpler and cheaper protection circuit, such as: http://www.batteryspace.com/pcbfor37...a-1alimit.aspx
Now you just need a charge regulator to make it perfect! The circuit above will cut off charge at 4.35V (or 4.275V if you believe the scan). Maybe a bit too high when considering wear&tear on the battery, but probably safe enough to avoid explosions and/or battery swelling
But a device like the one you've just designed already exists anyway, here's an example http://www.amazon.com/dp/B00152OCAQ/, both cheaper and more expensive models available..