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The phone will not stay on with a flat battery even with charger connected [answered]

asked 2014-01-10 10:26:16 +0300

euj gravatar image

This morning I ran out of battery and the phone had either shut down or gone down without shutting down. I connected the charger and it started blinking a red light and I could not get it to start back up. I removed the battery and tried with charger connected and battery out. The device just went into some kind of loop where it was doing some kind of 1sec power cycle or something. I connected the battery and it went back up and started charging. I managed to turn the phone on and it shut back down right after entering the pin code and unlock code because the battery was empty. And I had the charger connected.

Please make the phone not shut down with a flat battery if the charger is connected.

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The question has been closed for the following reason "the question is answered, an answer was accepted" by lk
close date 2014-01-18 18:55:06.876380

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answered 2014-01-10 13:36:23 +0300

egnat69 gravatar image

seems like usual behaviour... all my smartphones used to do this...

short clarification: the battery has to reach a minimum charge for security reasons beacuse otherwise you might kill it.

longer clarification: li-ion or li-po batteries become very (read: V-E-R-Y!!!) unstable if fully discharged (i.e. might explode). to prevent this, all batteries of this types have a security circuit that will destroy itself if discharged to a certain level, basically bricking the battery. if your phone would let you force-reboot with flat battery, that might happen, even if the charger is connected...

you might have circumvented this security-feature by reconnection the battery... maybe jolla should look into this as it could possibly be bad for the battery if possible... on the other hand, rebooting might just have used up more power than the charger was able to provide, therefore again the shutdown for security reasons..

most phones with user replaceable battery actually don't work without battery except when used with special flashing-cables (designed for the factory).

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I have never had to do any weird maneuvers to boot up my Nokia (Symbian) phones after the battery had run out so it probably has something to do with the shutdown/refuse-to-start threshold then. But I take your word for it that if other smartphones act like this too, it's probably a feature and not a bug as such. Accepted your answer.

euj ( 2014-01-10 14:01:37 +0300 )edit
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answered 2014-01-10 12:25:23 +0300

Sailor gravatar image

That's quite normal for mobile phones and sometime notebooks. Because they are powered via battery even if they are charging. So the battery needs a minimum level to boot otherwise the battery drains faster then charging is possible

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And the phone should take that into account and shut down with enough battery to power back up when hooked up on charger (the logic would be fairly simple, refuse to run with <3% battery unless charger is present). Lithium batteries don't like to be drained dry anyway.

mornfall ( 2014-01-10 12:28:59 +0300 )edit
1

Why not just charge it for a moment until you can power it on. If I need to send a message or make an important call when there's 3% battery left, I want to be able to do it.

hana ( 2014-01-10 13:51:31 +0300 )edit
1

@hana Recharge your phone more often, so you won't end up in a situation where the battery is empty and you need to make an important call.

ln ( 2014-01-18 23:16:30 +0300 )edit

Recharging the phone in a timely fashion is indeed a good idea, saves you also from troubles trying to boot it right after connecting the charger. And if I happen to use all the battery, I trust Jolla to protect it from destroying-level discharge.

hana ( 2014-01-19 00:16:40 +0300 )edit

Another similar issue. While updating my phone, after a factory reset. The phone rebooted during the update (before it had finished). Factory reset (by recovery was needed) restored to 1.0.0.5 and thus was needed to update by terminal to 1.0.2.5. However, after that, the phone would not boot, just kept rebooting after displaying the Jolla screen (white Jolla logo). Now, the phone was left for some time like this (I had stuff that I needed to attend to - children) and the phone got a completely flat battery. This in terms, means, I am unable to even enter recovery (vol-down+power), the phone simply will not turn on by this procedure. Also, If connect USB cable, pressing vol-down+power will simply enter fastboot mode - which is useless on Jolla devices. I have a full dump of my firmware that I can restore by recovery and dd method (did this many times), but this simply cant apply at the momnent, since the phone will not start at all if trying to enter recovery, Next attempt, is to keep the charger and leave it for some time, while I am at work, and hope that this will allow the battery to charge (Feel like this will fail, since the device is in a reboot look, and I think it simply wont charge enough because of this). A solution would be a new battery (where are those Jolla ?). If that fails, I guess it will be some hackery with connecting wires from power supply to the battery pins on the device. This shows, we are in a big need of some resort of recovering our devices by fastboot method. And I feel sure Jolla have the tools and images needed for this. Why are these not released in an open phone like this was supposed to be ?

Nieldk ( 2014-06-26 09:45:27 +0300 )edit

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Asked: 2014-01-10 10:26:16 +0300

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Last updated: Jan 10 '14