How long should a 4400mAh battery last in a T21?

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monkeynaut · #1 Post by **monkeynaut** » Fri Feb 03, 2006 5:50 pm

Hey there,

I just bought a 4400mAh battery off of ebay for my T21 (Pentium III 800MHz) and I don't know how dodgy the retailer is, so here's my question:

I'm showing about 2:00hrs battery time at 100% for a 4400mAh battery in a pentium III 800MHz, T21, is that about what I should expect?

If so, what would 3500mAh have given me? Yikes!

Thanks in advance...

AbsoluteRaleigh · #2 Post by **AbsoluteRaleigh** » Fri Feb 03, 2006 7:10 pm

You never know what to expect w/ aftermarket/refurb batteries (eg: 4400)...

djpharoah · #3 Post by **djpharoah** » Fri Feb 03, 2006 7:37 pm

dude im in the same positino as you.
noticing a lot of high capacity batteries on ebay from 3rd party manufacturers.

btw 2hrs is very low. that means the cells in that battery arent high quality
i get 3.5hours on an ibm 3600mAh

-dj

linux_inside v2 · #4 Post by **linux_inside v2** » Fri Feb 03, 2006 7:37 pm

usually on a fresh t21 battery people get around 2.5-3 hours according to IBM, and people have claimed to get 4 hours with an ibm 4.4MAH battery.
i get 1 and a half on my stock battery and it is under half of its design capacity according to IBM's software and Linux

Website · #5 Post by **tfflivemb2** » Sat Feb 04, 2006 10:33 am

One thing to keep in mind is what kind of tasks you are performing while running on the battery. I have had a 4400MAH last 3.75 hrs, but I didn't do anything with the laptop, I just let it run down. If I did it surfing the internet, then I only got about 2.5. With a DVD, I would just barely finish the movie when the battery would die....at about 1.75hrs.

djpharoah · #6 Post by **djpharoah** » Sat Feb 04, 2006 2:58 pm

curious to know did you buy this battery as it was advertised for T2x series or the T30. It seems that the T2x series and the T30 can share batteries.

cuz im thinking of buying a battery from ebay as well. however the ibm t20 batteries are 3600mAh while the t30 batteries are 4200mAh+. so just wondering which one you had.

lmk
-dj

monkeynaut · #7 Post by **monkeynaut** » Sun Feb 05, 2006 1:07 pm

The battery was new from ebay and is for a T2X, there is a posting about T30 batteries in T2X's here:

http://forum.thinkpads.com/viewtopic.ph ... 21+battery

When I say it shows 2:00hrs at 100%, that's according to the Windows XP power meter, I haven't actually played a DVD or tested it in real time with real activities. I'll do that and post again...

Here's the info from ebay:

http://cgi.ebay.ca/ws/eBayISAPI.dll?Vie ... RK:MEWN:IT

1 pc Brand New Li-Ion Replacement Battery for IBM Thinkpad T20 Series.

Replace IBM Model Number 02K6620,02K6621,02K6626,02K6627,02K6644,02K6645,02K6646 and 02K6649

Replace IBM Fur Number 02K6621

High Capacity, DC 10.8V, 4400mAh.

How long should a 4400mAh battery last in a T21?

How long should a 4400mAh battery last in a T21?

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