When to Charge your iPad?
This is a discussion on When to Charge your iPad? within the iPad 3 Forum forums, part of the Apple iPad Discussions category; I bought a 6 foot extension cord from Apple , I believe in buying their products as they will be top notch. I too keep ...
I bought a 6 foot extension cord from Apple, I believe in buying their products as they will be top notch. I too keep my
iPad plugged in all the time, I don't have to but if possible, I do. Now I have an iPad 1 64 GB WiFi and a new iPad 3 which arrived
Yesterday and I pre-ordered it from Apple.com and I also ordered another extension cord, tv adapter. Don't ask me how long it
Took to get it up and running........14 hrs.
03-21-2012 01:12 AM
Originally Posted by Skull One
Yup - Smart Chargers. You'll find many references to them on line for various rechargeable items. The difference being, the smart charger will know when to shut itself off when the battery is fully charged while the basic charger will continue to charge which in some instances can harm the unit being charged. In fact some items come with specific warnings concerning this. I'm glad that ipad isn't a problem. Thanks for all of the info.
Last edited by raveneap; 03-21-2012 at 02:27 PM.
If we keep our iPads on charge a lot of the time, are they using a lot of electricity? By that I mean are they like a tumble dryer that costs a fortune to use! I've on,y used my iPad for an hour and a half intermittently over the weekend and already it's used 21% of battery, so I thought I might keep it plugged into the charger more. Also, I find the plug gets quite hot while it's charging, is that normal?
I have seen a Lithuim-Ion battery explode, and it's not a pretty sight, can be quite dangerous too if someone happens to be close at the time.
Originally Posted by Skull One
Several years ago I was a member of a model Radio Control Plane flying club, and every Sunday morning, we had meets for the purpose of flying our beloved Radio controlled planes...lol. Most if not all, electric model planes use High Power, special Lithium-Ion battery packs, anyway, most of the flyer's had several battery packs, so they would often recharge them using special dedicated chargers usually in the boot of their car. Anyway one Sunday at one of these events, there was an almighty bang and big plumes of smoke & flames coming from one guys car boot (which was open) when the battery pack he was charging litterally blew up. It set fire to items in the boot plus totally wrecking loads of his gear, it even blew a hole through a plywood model stand.
Needless to say his whole boot was in a right mess, the point of the story.. is, these batteries have the potential to be dangerous, though more and more safety features have now been incorporated in them, and is indeed now a strict legal requirement.
Model car and plane batteries are designed to deliver very high currents indeed, unlike the battery in our iPads, but by their chemical design, all lithium-Ion batteries have the potential to be hazardous if faulty, or if they are not charged correctly.
Thankfully, things have moved on, and due to better designed inbuilt safety & monitoring features, and smarter charging designs, lithium-ion batteries are now used everywhere, so it's very rare to hear of problems, certainly with normal domestic devices anyway.
Lithium-Ion batteries can actually be ruined by running it until there is nothing left in it's cells, however this will never happen, as devices like the iPad will shut itself off well before that level is ever reached. ie. They have a optimum minimum/maximum voltage range.
It's best to topup charge your iPad fairly frequently, but though manufacturers claim there is no memory effect with lithium-ion batteries, it's not 100% true, there is still benefits to be had by cycling a lithium-ion battery occasionally. They certainly don't have the dreaded memory effect of batteries of foregone years, but letting your ipad run down, say once every month or two and charging to full again won't do it any harm.
It's worth reading the section near the end of this artical. You may find it interesting.
Lithium-ion battery - Wikipedia, the free encyclopedia
Last edited by Lunar; 03-25-2012 at 07:08 AM.
Yeah, your example is the major difference between consumer grade Lithium-Ion and specialty versions. Your friend made the mistake of not monitoring the internal chemical temperature of the battery while under a higher amperage charge rate. Basically when the battery hits 140 F ( 60 C ) the battery can begin a "self-heating" or "thermal runaway" condition. He was lucky no one was standing near the battery when it went off since the chemical spray would have easily been over 180 F ( 82 C ).
And your second example isn't possible in consumer grade batteries because they have internal circuit breakers to disable charging when the battery falls below 2.5v (if we use the industry standard). Now specialty batteries don't have this protection normally and that is why you hear about cars going "100% dead" and needing a factory repair. Because if you try to charge a Lithium-Ion battery below its low voltage threshold, you need so much amperage to overcome the chemical reaction of charging you tend to burn either the charging circuit out or you plate the anode and render the battery useless.
And the Wikipedia article on Lithium-Ion is a "so-so" primer but it lacks a great deal of detail. I recommend reading the patents and white papers from manufactures to get a full understanding on the subject.
Facts are the first casualty of bad information.
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