![]() So far i've manage in 4 days to get back to 86mAh as full charge capcity and i discovered some really usefull data form the sleepstudy (powercfg): What i did to get back to the original capacity is disabling the hybernation unless the battery drops at 2% of remaining capacity I left only standby enabled. The same capacity was reported by the BIOS, so the problem didn't look like a Windows problem. What happened after almost a year is that my battery from the original 97mAh dropped to 48 mAh the behavior I've experienced during these months was abnormal but predictable Actually every time i was waking up the system from hybernation, for the first 60 second i was able to see the real battery remaining capacity until the battery indicator suddenly dropped to 7%, then 1%, then automatic hybernation. My conclusion is that the BIOS and Windows battery programs are NOT measuring the charge of the Battery The Battery LEDs show a drop of 0.4 volts is a 20% drop in charge!īench measurements show a drop of 0.4 volts from a 108% charge is Still 100% charged! Thus the Laptop reports a drop of 0.11 volts is a 50% drop in charge! LapTop Diags (from Dell CDROM) report 3.91volts at cells is 50%. LapTop Diags (from Dell CDROM) report 4.02 volts at cells is 100%. (Running on load resistor all day some 20+ hours at 60% showing in the test LEDs.)ģ.92 – 3.8 – 3.5 volts per cell LED reports all at 60% charge. New tests on a 47 ohm load wired inside the battery: show (NOTICE 4.02volts will trigger the battery FET thermal kill of fuses!)ģ.86 volts per cell is 80% reported by LEDs BIOS at 71% charge Windows at 72% charge.ģ.80 volts per cell is 60% reported by LEDs.ģ.52 volts per cell is still 60%. The 3.6 volt cells are over charged to 4 volts in use. "54SanyoDELL 00" and with a rating 11.1V 5200mAh /58Wh that is really a :ġ0.8 Volt 10,800mAh / 38.8 Wh battery. Test battery is a fake mail order "Model 6000" reported as: Not a choice for the Military or Arctic.ĭELL Battery is a 11.1 Volt 53Watt Li. If you should be an explorer, a soldier, a solo sailor, a woodsman, or just an "out side" person on your own, NEVER use a "smart Battery" It could kill ya with all kinds of power still available to keep your work going. If you are interested in reading more about safety and care for Li-Ion batteries, you can check out this guide for further reading.ĭid you also get an XPS laptop with double-digit battery wear? Please share your results in the comments. As always, try to practice good battery care to prolong their lives: Keep them cool, don’t run them dry, and don’t charge them to maximum often. That’s it! Using this method I was able to reduce my 9575 reporting 14% wear down to 4%, my 9570 reporting 10% down to 3.8%, and my 9370 reporting 8% wear down to 4%, and I hope it fixes the problem for you simply as well. When you generate your battery report again, you should (hopefully) see a much higher rated capacity for your new battery. You should be able to use the laptop in Windows at this point, but I let it charge in BIOS out of superstition. Plug the laptop in and let it charge to maximum uninterrupted. Failing to perform this step can result in making your reported battery wear worse. Do not immediately charge the laptop be sure the laptop has been sitting cool and unplugged for 3-5 hours before the next step. This requires your turn off all of the sleep and hibernation timers in the Power Options control panel first, however. You could also use the laptop normally and let it run down until it automatically hibernates, then leave it in BIOS as described above as well. Copy and paste the following line into the command line: powercfg /batteryreport Right-click the search result to run your choice of app as an administrator. Go to the Start menu and search “cmd” to show the Command Prompt (PowerShell will do fine as well). If your battery is new and showing less than 95% of its original capacity then it is probably worth recalibrating. ![]() Checking your battery’s reported wearīefore bothering with a calibration, it’s necessary to check the reported health of your battery. ![]() Thus, even as someone who considers themselves to know quite a bit about notebooks, properly calibrating the battery in my new XPS laptops (showing incorrect wear percentages out of the box) was something I had to do a bit of reading up on combined with some trial and error to get right, and so I thought I would write a brief guide on how to do it right the first time.įollowing this protocol, I was able to reduce the reported wear levels significantly to the low single-digits and recover a good deal of battery life. Battery calibration hasn’t been much of a necessity since lithium-ion batteries got so much smarter over the past few years.
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