Whats the mAh on your battery?

Interesting that mine appears to be getting better. I've been tracking my battery power since I got it. The last on the list is after two days of being plugged in without any battery usage at all.

<pre>Date Full Charge mAh Cycle Count
March 16, 2006 5681 ?
March 17, 2006 5678 3
March 17, 2006 5683 4
March 19, 2006 5688 5
March 22, 2006 5671 6
March 23, 2006 5659 6
March 26, 2006 5622 6
March 30, 2006 5733 6
</pre>

MacBook Pro 2.16 1 GB 100 GB 7200 RPM Mac OS X (10.4.5) Mac mini 1.42 1 GB; PowerMac 450 MHz (Upgd. 1.2 GHz)

Well I left my MBP on the charger last night, and my full charge capacity now says 5385.
I played a DVD starting with 100% charge and it ran for exactly 2.5 hours until reaching 5% and getting the low battery warning. I turned off all other apps, has the screen brightness set at 8 bars, and turned off the bluetooth and WiFi. I used the built in speakers - I'm not sure how much of a difference headphones would make.
From what I've read this isn't too bad, but I'd be interested to hear about other peoples' experiences playing DVD's.
I'll do another test soon to see how long my battery lasts using different apps.

Mine held a good 3 1/2 hour charge while taking notes in class and then a couple days ago (it has happened several times now) I put it to sleep after using it for 30 minutes or so and it wont wake up. Then I try to shut it off and restart it, but it doesn't come on.
I checked the mAh and this is what it says now,

Battery Information:

Battery Installed: Yes
First low level warning: No
Full Charge Capacity (mAh): 1612
Remaining Capacity (mAh): 1227
Amperage (mA): -1559
Voltage (mV): 12024
Cycle Count: 18

Why would it do that? It is a fairly new battery as Apple replaced the old one under the recall. Will they send out another? or will I have to pay for the next one?
thanks

System Profiler reports that mine has a full-charge capacity of 5768 mAh.

Whats the mAh on your battery?

Mine is say 5681 after the first calibration. That's about 5% less than the theoretical 6000 mAh so I guess that is ok. I didn't write down the number but I think the number was around 5400 before calibration.

Hi,

Amp-hours (or milliamp-hours) is not a measure of energy or of power. In a sense, it's a kind of a proxy for energy but only when you make an assumption about the average voltage at which those amperes are delivered over those hours.

For starters, let's get the concepts right:

Voltage: A measure of "electromotive force" (take the words apart and you'll get the idea). EMF moves current. More volts will move more current through any given circuit.

Current measured in Amperes or Milliamperes: A measure of how much electrical charge is moving. Every electron has the same charge, so current is a direct measure of how many electrons are moving.

Power: The rate (that's important: it's a rate) at which energy is delivered or transmitted. In electrical systems, it is the product of the voltage and the current. The standard units are Watts. One watt is produced when a one ampere current is produced by a one volt potential difference.

Energy: In electrical systems, it's measured in watt-hours. One watt hour is the energy delivered by a one-watt flow over a period of one hour.

To properly (precisely and accurately) computer power and energy in the general case, you have to be able to do some integral calculus. The calculations are simplified if the voltage is constant (which it will never be for todays or any foreseeable eletrochemical energy storage technology). In that case, you can tell how many watt hours of energy are delivered by a given number of amp-hours by multiplying the amp-hours by the voltage.

Some examples:

1000 mAH (equal to one amp-hour) at a constant voltage of 12 V yields 12 Watt-hours of energy.

The MacBook Pro battery is rated at 60 WH. If the system consumes power at the rate of 10 Watts, it could run for six hours.


And so on. As I said, if you want real, accurate, precise numbers, you have to replace these simple multiplications by the integral of the (varying) functions of current and voltage over time.

Great fun. This is the easiest stuff in EE. When you get to alternating current the math becomes nighmarish. I switched to CS...


Randall Schulz

iMac 20" Core Duo; MacBook Pro Mac OS X (10.4.5)

After calibration I have 4952 mAh. Before I calibrated I had 200 mAh more than this. For a $2300 powerbook, I was hoping for at least 3 hours of battery life under reasonable use. I get ~2-2.5hrs.

Quicksilver 733 Mac OS X (10.4.5) Macbook 2.0 CTO

It's on the side of the battery that faces inward when it's installed. Shut your MBP down, remove the battery and you'll see it just above the bar code in the center of the panel.

Randall Schulz

iMac 20" Core Duo; MacBook Pro Mac OS X (10.4.5)

I've been tracking this since I got the computer. I started tracking after the first calibration.

<pre>
Date mAh Cycle Count
March 16, 2006 5681 ?
March 17, 2006 5678 3
March 17, 2006 5683 4
March 19, 2006 5688 5
March 22, 2006 5671 6
March 23, 2006 5659 6
</pre>


MacBook Pro 2.16 1 GB 100 GB 7200 RPM Mac OS X (10.4.5) Mac mini 1.42 1 GB; PowerMac 450 MHz (Upgd. 1.2 GHz)

My 1.83 has a full charge of 5211 mAh. I've only had it a couple of weeks. I calibrated the first day, and I just recalibrated again. I haven't timed how long my battery is lasting me, but it certainly isn't much more than three hours just surfing the web, using Word, etc. Tomorrow I'll time how long my battery lasts.

5564
Cycyle Count 6.

Going to reset power mangment and see what i get.

nothing changed but i powerd up without the charger. Funny how the rem. cap. was @ 5504 (takes that much power to power up huh)

Message was edited by: m_oody

My mAh is 5377 now, decreased from over 5500 in 3 days. I have 14 cycles, 3 weeks old. cry

BTW, when I first got my MBP, my battery is already like 3 weeks old, is this normal because they have to test the battery? But my cycle count was at 0 when I got it tho.

Im getting 5471MAH

5638 mAh.