I have a laptop Dell Inspiron 5567 (Windows 10) and today when I open the laptop I receive that message: "Alert! The AC power adapter wattage and type cannot be determined. The battery may not charge. The system will adjust the performance to match the power available."  Until this day, the laptop started fast and every applications started fast. And the battery is charging. Now the battery not charge and the laptop and applications started slowly.  So, I have this questions:   The battery should be change? The AC power adapter should be change? The laptop performance is affected by the battery or/and the AC power adapter? And how can be fixed? If I change the battery or/and AC power adapter the performance laptop will increase (as when the laptop was new)?   Note 1: I looked for similar question and I not found something useful. Note 2: If you need another information about the laptop, write back.
120917
I am using the original power adapter with the Dell Inspiron 6400 laptop and now when it boots up I get the following error message.  The AC power adapter type cannot be determined. You system will operate slower and the battery will not charge. Please connect a Dell 65 W AC adapter or higher for best system operation. To resolve this issue, try to reseat the power adapter.&quot;  I don't have another power supply or laptop to try. Is there a way to test the power supply, or whatever the computer uses to determine the power supply size?
90109
Sometimes my charger remains plugged into laptop even after charging is complete.  Is there a way to get a pop-up message/notification when my battery gets full due to charging or is there any software/package which can provide the functionality?
26704
I have a laptop that says it needs a 19V 3.42A power supply. I have a Dell 20V 4.51A power supply.  Can I use this power supply with my laptop, or will it destroy the machine?
48677
I'm new to the world of Apple, I bought a new Macbook Pro, mid-2020, Intel i7, 16GB RAM. I'm a developer, I run apps like VS Code, Sublime Text, Slack, Chrome (Multiple Windows), I play videos/songs in the background. I have been keeping a track of the energy consumption on my Mac, and it only runs for 4 hours. I have reset my SMC after I upgraded to Big Sur. Is 4 hours normal? or should I go to the service center? Update on 3 Feb 2021: I submitted my Mac to the Apple service center they said they conducted a few tests and the conclusion was that the battery is fine (I don't know what type of test they did). So I guess I'll be using it on AC Update on 12 Feb 2021: Took it to the service center, they didn't find any issues so I started using Safari for work and my battery has improved by 1 hour on Average.
82918
When your laptop's battery is 100% charged, should you leave it plugged in so any battery power doesn't get used, or will that cause overcharging, overheating, etc.? Should the laptop be unplugged when the battery level is 100%?  I'm asking because my laptop's screen tends to get dim when unplugged, so I don't like to run it on battery.
44721
I'm far away from civilization thats why I need your help guys. My problem is: MacBook Pro 13" early 2015 is not turning on and charging and the trackpad is also dead.   Charger's LED does not shine by any light(red/orange/green) . But I tested my charger with another MacBook and charger is working. I tried to connect another charger. First 1-2 minute I can see green light and then LED turns off. Trackpad is not react to any action (like double click). Right now this is just some plastic area Turn off and turn on battery connector also didn't help me.   The laptop did not receive any damage and was not flooded with water. Day or two before I got it from safe and checked my email then closed it and put to the safe again(hotel standard safe) (everything was okay but I didn't remember battery charge percent at that day) then I open and figured out that MacBook is dead.
23249
The charging port on my Acer laptop is dead, I thought it was the charger but I bought a new universal charger only to discover that the problem was the port on my laptop. The new charger has USB ports on it as well as different size heads, can I charge my laptop using the USB port since my charging port will not work?
39498
I would like my laptop to hibernate itself when the battery level is 10% to be sure it has enough power to complete the operation properly. Actually if I don't pay attention my laptop informs me it will hibernate when it's too late, so instead it brutally shuts down. This kills lithium batteries and is not acceptable.
37633
Basically, I'm looking for some do's and don'ts. Is it bad to keep my laptop plugged in when I'm not using it (majority of the time)? Is it bad to plug it in once I've finished using it (with it having something like 30% or 70% life left)?     This question comes up often and the answers are usually the same. This post is meant to provide a definitive, canonical answer for this problem. Feel free to edit the answer to add additional details.
39052
Possible Duplicate:        I have a Dell Vostro 1500 laptop, but unfortunately I lost the power supply in Indianapolis last month. I have a power supply for an old Sony laptop lying around, that looks like it fits in the same port.  Is it safe to use the old power supply in the new laptop? If they're not compatible will it simply not work, or will it reverse the polarity and open a gate to Zuul or something similar?  (A new PSU is on order, but UPS failed to deliver it yesterday and I need it today, hence this stopgap solution.)  Thanks!
15444
I've heard about laptops such as the new Chromebooks that are charged via a wall charger that connects to a USB-C port. I'm quite happy that this will supposedly standardize laptop chargers but I'm a little unclear about how this works.   Existing USB ports provide a 5 volt source, but the laptop chargers provide up to 20 volts. is there some kind of higher voltage line or are the USB-C powered laptops running on a lower voltage?  All this information I've seen gives a fairly vague idea of providing more power, providing up to 100 watts rather than 10 watts. Even so, my laptop is not the most powerful machine and the charger still outputs fairly near 100 watts, I can imagine more chargers for power laptops providing much more than 100 watts. Could a general purpose USB-C charger really power all these machines?
86412
I have powerbank that provides 5v (presumably regulated) power, as typical of most usb interface powerbanks. I have been trying out my powerbank with different phones. It works on all except one. I have tried it with various USB cables, making sure I didn't overlook anything foolish. Then, I looked at the AC adapter of the phone that it didn't seem to be compatible with. The adapter read: 5.4v DC output. The device's official website or manual doesn't tell me what the input voltage should be. So I have the following questions   Is the fact that the device's AC adapter creates a DC 5.4v output enough to assume that, this is the correct voltage for my cell phone? If 5.4v is the input voltage, then when I attempt to power it with a 5v power bank, am I hurting it? Thus far, it just seems to be non-responsive when I try this. It seems another explanation is polarity mismatch. I'm aware that laptops have a polarity correction feature, which could explain why I can charge this phone via my laptop. Is there any other way to tell if polarity is an issue, given that I don't have access to detailed product information (unless the official website is updated, or something)   So that's the gist of it, I'm not sure why my powerbank isn't charging my phone. And I'm having difficulty troubleshooting the underlying problem by myself. Any tips big or small will be appreciated.
87620
On my y510p, I set Lenovos battery software to "Optimize battery health" while I was in Windows 8.1. I forgot to change it before overwriting that partition with Ubuntu, and now my battery in Ubuntu never charges past 59~60%. I think this is due to something in the BIOS because it persists despite my Windows partition being gone.   I've searched the BIOS but there's no mention of battery anywhere!  I'm using Ubuntu 14.04 LTS.
85855
I'hv seen every 2 pin SMPS AC to DC adapters shows a little high voltage respective to the ground on the out put, on both + and GND wires(or more if more wires present).  This voltage is high enough to light small neon bulbs or a line tester, but very low current, barely could be felt. This voltage vanishes if I connect the output to ground somehow, e.g. touch it while standing on floor bare foot.  As the size of the adapter increases, the AC voltage and current increases. When laptop adapters are powered from a ungrounded AC outlet, they gives reasonable shock from the 19V DC(or whatever else) output.  Perhaps this is the reason why many 3 pronged laptop adapter carries a warning CONNECT ONLY TO GROUNDED OUTLET Connecting to a grounded outlet magically vanishes the high voltage.  I am aware about the EMI filtering capacitor connected between high voltage and low voltage ground, I tried to solve this by removing them, but this trick is not working.   Why and how this mysterious AC voltage is created ?  Is it harmful to sensitive electronics components ? Is there any way to solve this without grounding the DC output side ?
74217
We've got a range of laptops in our office all macbook pros some of which are 13" and some of which are 15".  The 15" laptops came with 85w chargers, and the 13" came with 60w chargers.   I want to buy some additiaonl chargers to leave plugged in around the office for anyone to use, but im unsure as to which type i should get.    Would charging a 13" laptop on a 85w power supply damage it ?  Would charging a 13" laptop on a 60w power supply damage it, or just make it slow at charging ?
45464
I bought a Dell Inspiron (which runs Windows 7) and they seem to have done something to the brightness controls because it seems to be more coarse than I remember from my previous HP Pavilion (EDIT: yep. I can only change the brightness in jumps of 6). I wish to get a better control of the screen brightness to tune it to the specific sweet spot I'm interested in.   The model is N5110.  Is there a program or setting that can do this for me?
67344
How do I change the low and critical battery levels to below 10%? I understand that this is a reasonable limit for most portable computers, but what about those with large batteries? On my computer (which has two batteries) 10% is an hour of runtime and is therefore way too high.