- 01-24-2013, 08:11 PM #1
I sent an e-mail to Nokia Customer Care (US) to ask if the charging process stops when the indicator light on the charging plate turns off (indicating the battery is fully charged), or if there is a risk of overcharging the phone if the fully-charged phone is left on the charging plate. I got a response today and the rep wrote,
In response to your concern, we would like to inform you that if your Nokia Lumia 920 is already fully charged, the wireless charger will display a one long blink. When the white indicator light goes “Off”, the battery is fully charged. However, if your fully charged phone is still in contact with the Wireless Charging Plate, the charging will still continue.
Please be advised also that the Wireless Charging Plate automatically switches “Off” when not in contact with a compatible device or if it is too hot. You may also turn “Off” your Wireless Charging Plate by disconnecting the power supply from the plate, then unplug from the wall outlet.
In addition to your inquiry, please be reminded that leaving your phone in contact with the Wireless Charging Plate will still cause overcharging the battery. With this, you can only charge your fully drained Nokia Lumia 920 for 4 to 5 hours using the Wireless Charging Plate.
This agrees with a statement made in the Lumia 920 user manual that says, "Do not leave a fully charged battery connected to a charger, as overcharging may shorten the battery's lifetime."
So, leaving the phone on the charger overnight can cause overcharging and damage to the battery. It's best to remove the phone from the wireless charging plate/stand as soon as it's done charging. If you use your Lumia 920 as an alarm clock and use the wireless charging stand, then it seems to me that it would be best to top off your battery charge before going to bed, and then unplug the charging stand from the power supply when you go to sleep so you don't risk overcharging your phone. Then in the morning, you can top off the battery again if needed.
Also, check out this informative post by GizmoEV:
Let's talk about battery charging. Wired vs Wireless.
Just wanted to pass this information along.
- 01-24-2013, 08:23 PM #3
Damn that sucks.
Sent from my 920
Last edited by ragingklu; 01-24-2013 at 08:56 PM.SLVR-->OG iP-->iP3G-->iP3GS-->HTC Fuze-->N1-->BB 9000-->Craptivate-->SGSII I777-->Surround-->iP4S-->Lumia 900-->SGH-I747-->SGH-I317 / iP5-->Lumia 920-->SM-N900A-->Lumia 1520
- 01-24-2013, 08:43 PM #6
I will stick my kill-a-watt on it and check it out.Current Phone: Nokia Lumia 920
Past Phones: iPhone 4, Motorola Atrix, Samsung Focus, Samsung Focus Flash, Nokia Lumia 900, Galaxy Nexus, Nexus 4
Tablet: Microsoft Surface Pro, Nexus 7
- 01-24-2013, 08:57 PM #7
I have been using my wireless charger for a month now. I start charging at 9pm or so and don't take it off until 5am. I know it charges by 12am or so. My battery has sucked up until the point I started using wireless. May have been something to do with portico but maybe the battery needs a little overcharge. As long as mine makes it to May. I'm upgrading to whatever isn't Nokia.
01-24-2013, 09:06 PM #8
- 121 Posts
I was just on the forums over on Nokia's website and the issue of overcharging was discussed on a thread. It seems that the general consensus was the charger shuts off when the battery hits 100%. Overcharging should not be an issue. Tomorrow when I get up I will check to see the back of the phone is warm. I usually leave my phone on my speaker over night.
- 01-24-2013, 10:02 PM #11
01-24-2013, 10:09 PM #12
- 112 Posts
I don't think Nokia's representative gave you a correct answer. My Lumia always stops charging itself when it reaches full battery charge, doesn't matter which charger I use or for how many hours it was connected to the charger... If it would be possible to actually overcharge it, the battery would simply explode or catch a fire, which has never happened so far to any Lumia 920 user. You should forward this response to Elop's e-mail address for clarification...
- 01-24-2013, 10:10 PM #13
I do not think this rep knew what they were talking about. I charge mine every night all night long on the wireless charger and the light if off and the phone not hot at all when I wake up.
- 01-24-2013, 10:12 PM #14
- 01-24-2013, 10:15 PM #15
- 01-24-2013, 10:18 PM #16
Reps have no idea what they are talking about. All modern cell batteries control themselfs! They won't accept a charge after they are fully charged. Electronics are built into the batteries. Charge away folks, not going to hurt a thing. Been leaving my Blackberries in the dock over night for 8 years.
Sent from my HTC6990LVW using Board Express
01-24-2013, 10:26 PM #17
- 112 Posts
01-24-2013, 10:29 PM #18
- 129 Posts
My 920 gets slightly warm whilst charging on the wireless charger but then stays stone cold after it is fully charged and left in position on the charger, if it was still charging or overcharging, surely it would stay warm?
Last edited by alphonsohall; 01-24-2013 at 10:41 PM.
01-24-2013, 11:11 PM #22
- 1,085 Posts
for me, the charger LED goes off when the phone's 100% charged, indicating that current has been stopped. someone confirms this with a volt-meter please.
btw i heard that li-poly batteries have internal electronics that prevents overcharging because if these are overcharged they'd catch fire and explode. so no i really don't think there is overcharging with these phones
- 01-24-2013, 11:28 PM #24
This has been discussed previously in another thread. Phone stops charging when it is full. When it is charging, phone is warm. When you wake in morning phone is cool to the touch. It stops charging and may turn on and off throughout the night and will not burn up your battery. Unless there is a malfunction which I haven't seen posted. Now as for wireless stand being a power vampire. I have no idea nor do I care. I'll pass on a cup of coffee once during month and pay for it. Your phones will be just fine. Since I started using my wireless my battery life has been great compared to what it was first couple of months pre wireless and Portico.
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