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Why do cell phone batteries last forever when unused but not laptop batteries
- Thread starter JEDI
- Start date
3 months of being off? Let me guess you didn't follow the instructions for storage for your particular laptop? every manuf publishes them.
A bad charger can destroy a battery in 3 months too. 0.1V less than spec is enough to torch a battery - google the proper care of your battery and you'll see on the 'net that it is not so simple.
A bad charger can destroy a battery in 3 months too. 0.1V less than spec is enough to torch a battery - google the proper care of your battery and you'll see on the 'net that it is not so simple.
well if you take the battery out and dont have it actaully in the laptop it should last longer.
li-ion batteries do lose charge over time but its quite slow. i remember we unloaded a pallet of hp laptops 7-8 years ago that hada mix of nimh and li-ion batteries for repair. the laptops had been sitting in a warehouse for nearly a year, and the nimh ones were all dead. the li-ion ones had nearly 50-60% charge after a year of not being plugged in.
if you keep li-ion batteries unplugged in ideal conditions they should last even longer.
li-ion batteries do lose charge over time but its quite slow. i remember we unloaded a pallet of hp laptops 7-8 years ago that hada mix of nimh and li-ion batteries for repair. the laptops had been sitting in a warehouse for nearly a year, and the nimh ones were all dead. the li-ion ones had nearly 50-60% charge after a year of not being plugged in.
if you keep li-ion batteries unplugged in ideal conditions they should last even longer.
Concillian
Diamond Member
I dunno about your cell phone, but if I have my cell phone on, but not in use, it shows 3 bars (full charge) for like 3 days, then will go from 2 bars to completely unusable in less than 8 hours.
My laptop, however, seems to much more accurately gauge battery time left, giving pretty accurate remaining charge values.
I think you may have a case where the measurement system is your issue.
My laptop, however, seems to much more accurately gauge battery time left, giving pretty accurate remaining charge values.
I think you may have a case where the measurement system is your issue.
no my cell phone and laptops measure proper and mostly linear. if you see a sudden drop its likely a damaged battery or really poor calibration of the power controller.
you do have to recalibrate as the system ages but you should never go from 20% to 0% in a very short amount of time.
you do have to recalibrate as the system ages but you should never go from 20% to 0% in a very short amount of time.
@ JEDI,
one thing I've learned is to not leave your laptop charger plugged in when you ABSOLUTELY DONT need it. It sucks the life out of your battery, did you do that? Because if you did, then that must have been the cause.
I would recommend you either start searching a laptop battery store online for a good deal, or start using your charger less... .but even so, along the run, you'll end buying a replacement, so it's a good idea to look now.
one thing I've learned is to not leave your laptop charger plugged in when you ABSOLUTELY DONT need it. It sucks the life out of your battery, did you do that? Because if you did, then that must have been the cause.
I would recommend you either start searching a laptop battery store online for a good deal, or start using your charger less... .but even so, along the run, you'll end buying a replacement, so it's a good idea to look now.
Last edited:
eh?? a laptop wall charger typically puts out ~19-20V. The circuitry inside the computer steps it down to the typical 11.1V. .1V variation from spec on the wall charger wouldn't do shit to a laptop battery. In fact, a 19V nominal input power will be able to power the laptop/charge the battery +/-2V or more
sorry my friend. out of spec chargers are the #1 killer of batteries, next to improper storage and charge cycles. every laptop manufacturer has a guideline on how to take care of your battery . ask them for it. it will tell you exactly what to do. If you do not believe me; you lack experience. I have dealt with charging racks (for schools) - where the charges were drooping - killing laptop batteries in a few months. Replaced the charging rack with 12 HP chargers - scope them for voltage output - all matched, battery problems all gone. sorry man all it takes is a slight variance from the oem spec to kill batteries. this is publicly documented by every manufacturer.
heat kills too - folks storing their 40 laptops in a closed room with no temperature control over the school summer (really hot,humid) wonder why their batteries are dead? - same setup in different school with batteries taken out with XX % charge left, placed in ziploc bags with silica packs, placed in a room a/c with humidity control - perfect after summer.
I can only say trust me on this - i sell to lots and lots of schools and see it all the time - improper care = death of batteries in months, proper case = years. Guess which the teachers tend to practice? - and don't get me started on how they love to yank the power connectors (standard chargers) out of laptops - it's so bad laptop manufacturers don't mount the charger circuit on the main board any more. they make it easily replaceable. kids these days. no respect for equipment.
Apple got it right with MAGSAFE - they have the most advanced charging systems on the planet for consumer laptops - but they have the same rules and guidelines that ACER has for proper care for lifespan of their batteries. reason why my 2008 macbook air still have 90% of the charge left (360 cycles) as day 1. Just had to replace the 2006-early 2007 macbook battery.
worst part is the documents are publicly available but like SAFE SEX ED - they don't preach it. lol.
heat kills too - folks storing their 40 laptops in a closed room with no temperature control over the school summer (really hot,humid) wonder why their batteries are dead? - same setup in different school with batteries taken out with XX % charge left, placed in ziploc bags with silica packs, placed in a room a/c with humidity control - perfect after summer.
I can only say trust me on this - i sell to lots and lots of schools and see it all the time - improper care = death of batteries in months, proper case = years. Guess which the teachers tend to practice? - and don't get me started on how they love to yank the power connectors (standard chargers) out of laptops - it's so bad laptop manufacturers don't mount the charger circuit on the main board any more. they make it easily replaceable. kids these days. no respect for equipment.
Apple got it right with MAGSAFE - they have the most advanced charging systems on the planet for consumer laptops - but they have the same rules and guidelines that ACER has for proper care for lifespan of their batteries. reason why my 2008 macbook air still have 90% of the charge left (360 cycles) as day 1. Just had to replace the 2006-early 2007 macbook battery.
worst part is the documents are publicly available but like SAFE SEX ED - they don't preach it. lol.
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