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Vintage Computers Any vintage computer systems, calculators, video games etc., but with an emphasis on 1980s and earlier equipment.

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Old 22nd Jun 2017, 8:10 pm   #1
terrybull
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Default Battery Panasonic CF-28 laptop.

I need to replace the battery on this old laptop. I am having a job to find one (they are listed by various suppliers and are either silly money + £££££ postage from the States or out of stock when you go to order) so I have managed to open the battery which wasn't easy and will try and re cell it. These must be 3.7V cells but they are unmarked. The attached shows how they're connected.
Battery pack rated at 11.1V 5.4Ah. Each cell measures 65mm X 17.5 MM diameter. Is there a 'type' designation for this size as I only seem to find the smaller AA sizes.
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Old 22nd Jun 2017, 8:11 pm   #2
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Default Re: Battery Panasonic CF-28 laptop.

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Old 22nd Jun 2017, 10:06 pm   #3
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Default Re: Battery Panasonic CF-28 laptop.

Lithium cells are sized by dismeter and length. For instance, an 18650 cell is 18 mm.ø by 65.0 mm. long. (Same as a 2032 is 20 mm. ø by 3.2 mm. thick.) Even if they are not labelled, you should be able to measure them and find suitable replacements.

EDIT: Actually, that sounds like what you have got. 18650 is a very common size. You should be spoilt for choice.
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Old 23rd Jun 2017, 7:11 am   #4
terrybull
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Default Re: Battery Panasonic CF-28 laptop.

I think you're right Julie M. 18650. Just what I needed to know. They seem to be listed as for flashlight so I assumed they were AA size but delving into the details they do seem to fit the bill.
Thank for that.
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Old 23rd Jun 2017, 7:15 pm   #5
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Default Re: Battery Panasonic CF-28 laptop.

I have been told that the electronics built into the pack keep a track of the 'wear level' and even if new cells are fitted they may not fully charge.

I had problems with a new pack (different issue to you) but the information received was interesting. Don't know if it would help or not but perhaps worth a read.

http://www.diyaudio.com/forums/every...questions.html
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Old 23rd Jun 2017, 7:22 pm   #6
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Default Re: Battery Panasonic CF-28 laptop.

The CF28 has a battery refresh routine, which I believe takes care of all that.
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Old 23rd Jun 2017, 8:31 pm   #7
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Default Re: Battery Panasonic CF-28 laptop.

Ah that's interesting. I hadn't heard of that before..
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Old 24th Jun 2017, 9:18 am   #8
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Default Re: Battery Panasonic CF-28 laptop.

Some modern batteries have very complex circuitry to ensure only official branded batteries are used. I beleive (hope) that my Panasonic is sufficiently ancient to not have such complex shenanigans.
There is an interesting YouTube video of someone who hacked the replacement battery on a laptop to get it to recognise and charge it.
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