Friday, July 29, 2011

How to Repair a dead laptop

Dead Laptop Battery
Two weeks ago PCMech had an article on "how to revive a dead laptop battery". (Read the article if you want to try to revive a battery).
I used two laptop batteries from two different laptops to tested this theory.
The first battery is very old, made in 1997 from an old IBM T-23, it would charge up in about fifteen minutes and discharge in ten.
The second battery is fairly new from an old IBM T-30 it would charge up in about an hour and a half and discharge at a little over two hours.
First step is to put the batteries in the freezer for twelve to fourteen hours (basically over night) then charge and discharge the batteries four or five times.
My tests:
IBM T-23:
 1st charge took 1 hour 25 minutes, discharge 1 hour 5 minutes
 2nd charge took 1 hour 50 minutes, discharge 1 hour 45 minutes
 3rd charge took 1 hour 05 minutes, discharge 45 minutes
 4th charge took 1 hour 20 minutes, discharge 1 hour 17 minutes
With the last charge I left the battery in the laptop for 3 days and repeated the discharge/charge test:
Discharge took 1 hour 20 minutes, charge 1 hour 17 minutes, final discharge 1 hour 17 minutes.
IBM T-30:
 1st charge took 1 hour 02 minutes, discharge 1 hour 0 minutes
 2nd charge took 1 hour 15 minutes, discharge 37 minutes
 3rd charge took 1 hour 05 minutes, discharge 45 minutes
 4th charge took 1 hour 03 minutes, discharge 44 minutes
Note: The T-30 is my firewall/proxy server and was in a mini-docking station and draws more power than indicated, the discharge time would be closer to 1 hour
45 minutes.
What does this ‘freezing’ the battery do?
By freezing the battery it removes the built up memory by charging a battery for a short time then using the battery. Over time this build up of memory of where the last charge started shortens the discharge time. An older battery also has the chemicals in the battery depleted with out doing any physical testing of the chemicals (not knowing the original amounts of each individual chemical – manufacture proprietary information) it is unknown if the freezing causes the chemical compounds to revert back to their original state.
The T-23 battery would vary in the charge and discharge time so this would suggest that the chemicals are not reverting back to their original state.
The T-30 battery was consistent with a brand new battery in that if fully charged it would last from 1.5 to 2 hours (also note this laptop has been upgraded with a faster processor, more memory, and that is somewhat offset by having a 32 GB SSD [which draws less power] ).
Because the T-30 is my firewall/proxy server I can’t be bouncing it willy-nilly to do these test so the next series of batteries will be T-23 batteries (six or so of them) some of them are so dead they will not charge, this will be a very good test, will add my results to the comments section.
Here is a page where I used a program to find out how much life was left in some batteries I tested: Laptop battery tests
I have one more test and that is on my cell phone battery. I have two batteries both of the same age but one was not used as much as the original battery. The original battery will last approximately two days, the second battery will last approximately four days.
This will work on a Cell Phone battery as well, the old battery would die in a day before freezing, after the third recharge it has lasted over four days and that is with use. It is now on it’s forth recharge.
Find more tutorials for Laptop troubleshooting steps and checklists here.
If this post made you say “Ohh … yea!”, please spread the word via that retweet button below.
Go ahead, post your input as a comment below. I’ll be reading every single one.
This entry was posted in Hardware Discussion and tagged battery, charge, Dead, DIY Computer Repair, laptop,revive. Bookmark the permalink.
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