Thanks, very informative.
Doris O
On Sun, Mar 31, 2013 at 3:34 PM, Bruce Carter <rbrucecarter@yahoo.com>wrote:
> > Does using your phone with the charger/AC conserve battery life as it is
> my understanding that it is the charge cycles that use up the battery?
>
> A lot of people have bad memories associated with the old NiCad batteries,
> which did have a memory effect. The battery chemistry in an iPhone is
> LiIon - which is a completely different technology with its own
> peculiarities.
>
> The main enemy of LiIon batteries is heat, get them too hot and it hurts
> their life. Unlike NiCad, which had a cell voltage of 1.2V, NiMH which
> also has a cell voltage of 1.2V, and alkaline with a cell voltage of 1.5V,
> the cell voltage of a LiIon battery is around 4V. Fully charged it can be
> 4.2V, fully discharged is about 2.5V. If you ever fully discharge a LiIon
> - it is destroyed. Fortunately, the iPhone and other devices that use this
> battery chemistry have sophisticated electronic controllers to prevent that
> from ever happening - they will tell you the battery is "dead" long before
> it discharges to that 2.5V level.
>
> You will NEVER see stand alone LiIon batteries for sale in the store, only
> battery packs with the electronics built in, and terminals that can't be
> easily shorted. A LiIon battery, if fully charged, can be very dangerous.
> If shorted, it can achieve temperatures similar to molten lava - meaning
> if your LiIon powered iPhone or any other device with that type of battery
> starts overheating, your safest recourse is to place it on a concrete
> surface and back away. That is a VERY rare occurrence, though, because
> most LiIon batteries have a fuse built in as a last resort safety keeping a
> short from happening. The very few incidents of meltdown have been the
> result of multiple failures of safety systems simultaneously -
> statistically very rare. The people that put the iPhone in the blender,
> however, were extremely foolish because that is probably one way to cause
> LiIon shorts and catastrophic melt down, not to mention the release of all
> kinds of toxic substances.
| Reply via web post | Reply to sender | Reply to group | Start a New Topic | Messages in this topic (5) |
Aucun commentaire:
Enregistrer un commentaire