What does it mean by charging battery 2-3 cycles?
 

Hi there,
just got myself a nokia 770 arnd 2 weeks ago.
What does it mean by charging battery 2-3 cycles?

Re: What does it mean by charging battery 2-3 cycles?
 

Good question. I would ignore that and just charge it.

Re: What does it mean by charging battery 2-3 cycles?
 

you sure?
hmm...okay then.
do you know what's the battery capacity of nokia n770 ? 1500mah or 1300mah ? it's not stated on the battery.

Re: What does it mean by charging battery 2-3 cycles?
 

On second though, I'm wondering if several cycles means all the way from no battery to full being one cycle, so several cycles would mean several chargings.

A mag article says the battery is 1500 mAh.

Disclosure: I don't have a 770, just an 800.

Re: What does it mean by charging battery 2-3 cycles?
 

okay dude.
thanks for clarifyin my thoughts..gotta upgrade to 800 :)

Re: What does it mean by charging battery 2-3 cycles?
 

Avoid the discharges, that just detoriates the battery's capacity and lifetime. Charge it when you can, and definitely try to get it to a charger when it reaches 50% (at least as a general rule). It's best to interpret "charge cycles" as charging from half-full, not from empty. Now, for old NiMH batteries it made sense to fully discharge and charge a few times.. but not really for modern lithium batteries. The user manuals tend to keep the old advice, which is unfortunate.
In day-to-day use lithium batteries can be charged at any time, for as short or as long as you want.

Re: What does it mean by charging battery 2-3 cycles?
 

Actually most LiON batteries last longest if fully charged and then discharged till the device says low battery two to three times initially. After that you can charge at any time.

On a LiON battery there are cells that will remain uncharged until fully charged/discharged for a couple cycles.

Re: What does it mean by charging battery 2-3 cycles?
 

P.S. The couple full charge/discharge cycles also assists in calibrating the battery meter properly.

Re: What does it mean by charging battery 2-3 cycles?
 

Not really. At least not for the type of 3-cell batteries used in mobile devices. This more applies to stacked battery cells as used in e.g. laptops (cells are stacked to get to much higher voltages).

Re: What does it mean by charging battery 2-3 cycles?
 

You can't really fully charge/discharge LiON battery. The power controller let's you the most time only charging and discharging between 10% and 90%.

While the battery is only charged at 90% your device will see a 100% charged battery

EDIT : For more information : http://en.wikipedia.org/wiki/Lithium...ure_and_charge

Re: What does it mean by charging battery 2-3 cycles?
 

I'm interested in a reference for this.. (the wikipedia entry doesn't have any) What I know is true (and also mentioned in the wikipedia article) is that you can quickly charge to 90% and the meter will show 100% (the actual charge may even be less than 90%, closer to 80% in my experience), but at that stage the charger will continue to charge (and show it), until you _really_ reach 100%. Or close to. My Palm T3 can be charged to 4.24V, which is fairly close to the internal battery-cutoff at 4.30V. Above 4.30V it becomes dangerous and must be considered the theoretical maximum, so I'm pretty confident it's safe to say that my T3 charges to at least 98% :)

batteryuniversity.com have some articles that are more in-depth than the wikipedia entry, e.g. http://www.batteryuniversity.com/parttwo-34.htm (the rest of the site is interesting too, start with just http://www.batteryuniversity.com/)

Re: What does it mean by charging battery 2-3 cycles?
 

I've had my 770 for just over a week. It wouldn't turn out of the box, and i had to charge it first. But very soon, it came up (on the charger). Eventually, it said it was full, and i took it off charge. The next two cycles, i started the charge when it said it was low, but did not happen to have it on when full - so i never saw the "full charge" note. The indicator showed, what is it, five bars - looking full. Last night, i happen to be using it while charging, and saw full.

One of my cycles seemed short, but not the first. Probably wasn't fully charged, even though it showed it. But even my first cycle seemed long. So, i've no idea what the manual is talking about.

Given that the 770 can tell me that the battery is full or empty, it seems like it could do something about it. For example, when the battery is full, but still on the charger, it would be nice if it would take it off the charger itself. Then, i could put it on charger, and ignore it, rather than become their slave. I have a smart charger for my NiMH standard batteries. I put batteries on it, and go to sleep. In the morning, i put more batteries on it, and go to work. 1,000 cycles are promised. That's once a week for 20 years. I've actually gotten over ten years from a battery set.
I say 'smart charger', but i'm not talking rocket science. What is it? A voltage comparitor and a switching transistor? How much could that cost?

Re: What does it mean by charging battery 2-3 cycles?
 

Don't worry, it _does_ disconnect the charger. If it didn't, the battery would soon explode (as it passed 4.30/4.40 volts or thereabouts). All devices which charges lithium ion / lithium polymer batteries must include a charging circuit that stops charging when the battery is charged to a certain voltage level (depends on the device, my T3 charges to 4.22 volts, don't know how the ITs are set up).

I charge all my lithium devices (phones, PDAs, tablet) over night now and then.

(In addition to the charging control circuit in the tablet there's also an overvoltage protector in the battery itself, at some higher setting than the device. This is just an emergency thing though, in case the device (the tablet) fails.)

Ref. http://www.batteryuniversity.com/