Leaving Pandora on indefinately

[McLovin]

Hehe, even as a Information technology Technician I understand that never plug battery while device gets power But you never can warn people enough ^_^

Precisely.


I'd feel pretty bad if someone found the info about running minus battery, but never saw the warning, even if it is what I feel to be common sense.

I'm really not seeing how it's common sense. It's standard to insert external power, either from a wall adapter or USB, while a device battery is inserted. The device will usually switch to the external power, possibly because the rail goes to a slightly higher voltage which wins when supplied. There could also be some sense circuit which recognizes this and switches to charging the battery. Why is the opposite so obviously wrong? Why would you expect the state transition to the opposite cause some kind of serious hazard? I would intuitively expect it to start charging the battery.


Note that the other scenario of removing the battery without powering down has never been condemned and is often recommended.


Not saying there isn't some common reason that people might expect not to do this, but I'd also think that most devices would have protection circuitry to prevent this from being a hazard to your device if it otherwise were. I was pretty much yelled at for leaving my Pandora plugged in all the time with the battery in, being told common sense dictated that this would be a hazard for any device, and that normal people wouldn't do this. Now you can see that a lot of people do this and it's anything but common sense to expect it to be dangerous.

It's probably because there are quite a lot of picky geeks with lots of chinese-gadget experience in this community and to them it might seem common sense

 

[Prometheus]

Hehe, even as a Information technology Technician I understand that never plug battery while device gets power But you never can warn people enough ^_^

Precisely.


I'd feel pretty bad if someone found the info about running minus battery, but never saw the warning, even if it is what I feel to be common sense.

I'm really not seeing how it's common sense. It's standard to insert external power, either from a wall adapter or USB, while a device battery is inserted. The device will usually switch to the external power, possibly because the rail goes to a slightly higher voltage which wins when supplied. There could also be some sense circuit which recognizes this and switches to charging the battery. Why is the opposite so obviously wrong? Why would you expect the state transition to the opposite cause some kind of serious hazard? I would intuitively expect it to start charging the battery.


Note that the other scenario of removing the battery without powering down has never been condemned and is often recommended.


Not saying there isn't some common reason that people might expect not to do this, but I'd also think that most devices would have protection circuitry to prevent this from being a hazard to your device if it otherwise were. I was pretty much yelled at for leaving my Pandora plugged in all the time with the battery in, being told common sense dictated that this would be a hazard for any device, and that normal people wouldn't do this. Now you can see that a lot of people do this and it's anything but common sense to expect it to be dangerous.

It's probably because there are quite a lot of picky geeks with lots of chinese-gadget experience in this community and to them it might seem common sense

Certainly not myself, though. (A geek, definitely. Picky, not really. Not much idea about Chinese gadgets, either.)


The reason I thought that it was common sense was because I always figured that it might be risky to mess with power-related stuff whilst something already has power running through it - I've seen it that way ever since I was a little kid, so that's the way my own view on it has always been. I must admit that I had no idea of the opposite point of view!

 

[slaeshjag]

Not entierly common sense to me, I switch batteries on my laptop without unplugging it all the time, with the difference being that most laptops are actually designed to handle it

 

[RunningSpoon]

Hehe, even as a Information technology Technician I understand that never plug battery while device gets power But you never can warn people enough ^_^

Precisely.


I'd feel pretty bad if someone found the info about running minus battery, but never saw the warning, even if it is what I feel to be common sense.

I'm really not seeing how it's common sense. It's standard to insert external power, either from a wall adapter or USB, while a device battery is inserted. The device will usually switch to the external power, possibly because the rail goes to a slightly higher voltage which wins when supplied. There could also be some sense circuit which recognizes this and switches to charging the battery. Why is the opposite so obviously wrong? Why would you expect the state transition to the opposite cause some kind of serious hazard? I would intuitively expect it to start charging the battery.


Note that the other scenario of removing the battery without powering down has never been condemned and is often recommended.


Not saying there isn't some common reason that people might expect not to do this, but I'd also think that most devices would have protection circuitry to prevent this from being a hazard to your device if it otherwise were. I was pretty much yelled at for leaving my Pandora plugged in all the time with the battery in, being told common sense dictated that this would be a hazard for any device, and that normal people wouldn't do this. Now you can see that a lot of people do this and it's anything but common sense to expect it to be dangerous.

It's probably because there are quite a lot of picky geeks with lots of chinese-gadget experience in this community and to them it might seem common sense

Sorry, not a picky geek here. Perhaps you are then, since you know about these chinese-gadgets? Enough of insults..


There is little chance that when connection or disconnecting external power source (battery in this case) it can create an electric spike that can break down weak components.


(Since I have no idea what kind of components Pandora uses, I still keep my basic idea not to do it.)

 

[Exophase]

Sorry, not a picky geek here. Perhaps you are then, since you know about these chinese-gadgets? Enough of insults..
There is little chance that when connection or disconnecting external power source (battery in this case) it can create an electric spike that can break down weak components.


(Since I have no idea what kind of components Pandora uses, I still keep my basic idea not to do it.)

So the same would apply to not ever plugging in USB while on, right? But no one advises that.. the PMIC/other regulators and bulk/coupling capacitor network are supposed to prevent power transients to components.

 

[WizardStan]

I suspect this "don't put the battery in while it is mains powered" may be one of the reasons it's an unwritten feature: in addition to complete testing, they probably didn't have the time or resources to make the package properly transition.

 

[bismuthdrummer]

I've never hot-swapped batteries on my laptop, nor would I since I distrust that sort of swap... but USB devices seem to me just fine for swapping. Many of my USB devices don't even have power switches, so I'd have to turn off the host to remove them, which would seem quite counterintuitive for such a recent technology (compared to mains chargers).


Now someone's going to show me a relic blueprint for universal serial connections from 2200 B.C., and I will be forced to eat my hat.

 

[PowerGod]

ehm... I have some confusion in mind (too much to read and I'm too much sleepy)...


tell me if I undestood correctly:


1) Some (~90-95%) Pandoras can be powered from the main charger, without the battery inserted


2) ALL Pandoras can be powered by USB, without battery inserted


3) With latest firmware the battery won't overcharge and become "puffy" anymore


4) Battery swap with pandora charging is BAD


5) Battery swap with pandora ON, but not charging, is GOOD :blink:

 

[Exophase]

2) ALL Pandoras can be powered by USB, without battery inserted

I've never been able to do this, it won't even boot. I don't think it provides enough current.

 

[Linux-SWAT]

1) Seems correct.


2) Never heard of that. I'm pretty sure it's false.


3) Yes. And it recalibrates correctly.


4) It's not recommended to insert a battery while on.


5) Dunno, but i think it's same as 4)

 

[WizardStan]

5) Battery swap with pandora ON, but not charging, is GOOD :blink:

Impossible. The instant you remove the battery it shuts off. The problem is putting in a battery while plugged in, period, whether it is charging or not. If you remove the battery, even with it plugged in, the temporary break in current is enough to reset it. It will then reboot on AC power. Do not put the battery back in at this point.

 

[urjaman]

Yep, cannot run from USB only. Why not is basically chipset details, but the system can exceed USB current limit in normal usage - and usb power is used to extend battery life, not charge the battery in these cases.

 

[RunningSpoon]

So the same would apply to not ever plugging in USB while on, right? But no one advises that.. the PMIC/other regulators and bulk/coupling capacitor network are supposed to prevent power transients to components.

You have a good point about that USB. But USB was designed for Hot swapping. Which means no boot are required if you connect USB devices.


I couldn't find Voltage and Current values of Pandora's Battery, so my argument is not on solid ground when we speak about Pandora and electric spikes.

 

[PowerGod]

thanks to the clarifications, reading again what I wrote... I was VERY sleepy


so, you can't turn on Pandora from USB, but you can recharge the battery from it, right ?

 

[Exophase]

thanks to the clarifications, reading again what I wrote... I was VERY sleepy


so, you can't turn on Pandora from USB, but you can recharge the battery from it, right ?

If you put it to sleep it might charge. If you use the Pandora for anything during that time, probably not.

 

[TrashyMG]

I've Charged it fully using USB when putting it in low power mode. while using it, It just seems to maintain the current battery level.

 

[urjaman]

Turn off the LCD and USB will charge overnight. Better put it in sleep mode of course. Idle and screen on and the system (battery gauge /sys files) reported 16.5 hours to full (from about 8%).

 

[Darkknight512]

I only charge my Pandora off USB and I never go in low power mode. It usually charges at around 200-300 mA with the screen on and about 370 mA with the screen off. With the new kernel it can charge at 550 mA (not over USB spec, 4.2v vs 5.0v) when everything goes into the automatic low power mode, I don't flick the switch because it crashes my Pandora.