121–130 of 133 posts
Earlier quoted context omitted.
If you're wondering why we still use lead-acid batteries in cars, it's because they don't have a memory effect and a high power to weight ratio.
Oh, I'm aware of what value a lead-acid battery has in cars. But after considering it for a short bit I'm not so surprised that you could jump start a car with a smaller lithium battery (as opposed to the bulky equipment that most mechanics around here will carry around to do the job).
Earlier quoted context omitted.
If you're wondering why we still use lead-acid batteries in cars, it's because they don't have a memory effect and a high power to weight ratio.
Oh, I'm aware of what value a lead-acid battery has in cars. But after considering it for a short bit I'm not so surprised that you could jump start a car with a smaller lithium battery (as opposed to the bulky equipment that most mechanics around here will carry around to do the job).
You are slowly recharging the existing car's battery so that it has enough charge to start the car.
If you disconnected the car's battery this wouldn't work.
The big battery (and leads) that your mechanic uses does have sufficient capacity and peak current to jump start the car, even if the car's battery was disconnected.
An old, old trick is to recharge your car battery in an emergency with a bunch of dry cells (eg torch batteries).
Impressive that it sells for $25 given that I just (yesterday) paid $60 for a Fujitsu MC700 10,400 mAh battery.
The battery in this phone is only 1,000 mAh, so not that impressive really. Edit: my mistake, the phone is 10,000 mAh. Impressive indeed!
Panasonic's best 18650s have a capacity of 3350mAh, which sets an upper bound of 6700mAh for the pack:
http://na.industrial.panasonic.com/products/batteries/rechar...
Those "5000mAh" 18650s you find on eBay come from Chinese manufacturers who stick random numbers on cylinders, so the actual capacity is probably off by a factor of 3-5:
http://lygte-info.dk/review/batteries2012/UltraFire%20TR1865...
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> battery life that would probably outlast 3-4 iPhones. And functional life as well. iOS 8 crippled A5 devices which had previously chugging along quite decently. Planned obsolescence sucks (in iDevices' case, it also affects present performance, i.e. Safari constantly having to reload tabs because the device has little RAM to spare). Unlike a smartphone, a simpler device won't be reduced to be unable to perform its…
You don't have to upgrade to iOS 8. Similarly, the 8210 wouldn't have had software upgrades, which naturally would be geared towards newer devices and cause the device to also slow down.
Earlier quoted context omitted.
Also, the lower weight makes the phone more resilient to drops. Anecdotal evidence: I've never seen a cracked iPhone 5, but cracked iPhone 4's were common. Less volume means less mass, which means less kinetic energy that must be absorbed by the frame when dropped on the floor. Thin and light phones don't need a protective case like thick and heavy phones do.
iPhone 6 models in my workplace (sample size 2000/12000) are about 4x more likely to break than 5/5s models.
This is likely a truly unbranded OEM feature phone based on a Mediatek or Spreadtrum reference platform. Resellers then add their own branding to it. I couldn't find that exact one but a bit of searching turns up similar models: http://www.aliexpress.com/item/9000mAh-long-standby-power-ba... http://www.alibaba.com/product-detail/Original-H-mobile-X8-4... http://www.aliexpress.com/store/product/Original-Xiaocai-X6-...…
Earlier quoted context omitted.
Oh, I'm aware of what value a lead-acid battery has in cars. But after considering it for a short bit I'm not so surprised that you could jump start a car with a smaller lithium battery (as opposed to the bulky equipment that most mechanics around here will carry around to do the job).
But you are not jump starting the Car with the Lithium battery. You are slowly recharging the existing car's battery so that it has enough charge to start the car. If you disconnected the car's battery this wouldn't work. The big battery (and leads) that your mechanic uses does have sufficient capacity and peak current to jump start the car, even if the car's battery was disconnected. An old, old trick is to recharge…
http://thepowerall.com/index.php?route=information/informati...
The video at the lower right shows the Jeep starting with the vehicle battery disconnected (the booster is clamped to the disconnected positive lead).
Earlier quoted context omitted.
Oh, I'm aware of what value a lead-acid battery has in cars. But after considering it for a short bit I'm not so surprised that you could jump start a car with a smaller lithium battery (as opposed to the bulky equipment that most mechanics around here will carry around to do the job).
But you are not jump starting the Car with the Lithium battery. You are slowly recharging the existing car's battery so that it has enough charge to start the car. If you disconnected the car's battery this wouldn't work. The big battery (and leads) that your mechanic uses does have sufficient capacity and peak current to jump start the car, even if the car's battery was disconnected. An old, old trick is to recharge…
While I respect that you seem to have read a more circumscribed version of my comment, I'm not sure what your quibble is. A two-pound battery pack that can be used to jump-start your car seems like a heck of a win for most people.
Yes, you can start your car by disconnecting your battery and connecting a charged lead-acid battery. That seems pretty obvious. I can't think of a reason you'd need to do this, though, unless your car's main battery has gone bad. And if that's the case you will need to call a mechanic anyway.
Leave alone that the lithium batteries mentioned above are advertised to supply 400 amps, enough to start many cars.
Earlier quoted context omitted.
iPhone 6 models in my workplace (sample size 2000/12000) are about 4x more likely to break than 5/5s models.
Interesting. I remember people complaining that the iPhone 6 was slippery, and of course it is heavier than the 5/5s. Do you also have numbers for 4/4s and 6 vs. 6 plus?
5/5s was better than 4/4s, but not dramatically so.