Mobilecollectors.net

Motorola 6 volt battery

Motorola 6 volt battery

Postby wibs » 2014 May 21, 15:13

This post covers the 6 volt battery used in the motorola mictac range and its derivatives. The battery pack has many different cells fitted to it both Nicad and NimH. They are usually the standard F7 size. I am in the process of rebuilding one from a FlaRe. The package number is SNN4612B 1B5103:GCD. It contains non-standard F7 cells. They are the standard length 17 mm and standard depth 6mm but are only 14 mm wide compared to the standard size of 17mm. They are a loose fit in the case but due to its internal shape the case will not take 5 standard F7 cells.
wibs
 
Posts: 15
Joined: 2013 Sep 10, 20:05

Re: Motorola 6 volt battery

Postby oldmobil » 2014 May 21, 20:28

Hi,
Thanks for this useful info!
Hard to find working battery for Microtac family, so the only way to renew it. But without daily using the new cells will go bad within 2-3 years. So my idea to convert an old battery pack to holder for five replaceable Ni-MH AAA cells. I could charge these with my standard Voltcraft AA/AAA charger, and put them to the Motorola battery case when I want to test an old phone.
Maybe I'll not loose capacity because an F7 prismatic cells are around 700-800 mAh and a state-of-the-art AAA cell gives me 800-900 mAh.
I converted an Ericsson GH/GF/EH 197/198 battery to use AA cells same way:
Image
Image
User avatar
oldmobil
Site Admin
 
Posts: 167
Joined: 2013 Mar 21, 11:01
Location: Budapest, Hungary

Re: Motorola 6 volt battery

Postby spectreman » 2014 May 22, 05:10

Hi. I have several nicad & NiMh battery packs for the microtac phones.
I have managed to successfully restore about half of them.
Quite often when first used for a long time, the batteries will not start charging on the XT charger.
I kick start the packs by connecting a 6-7v DC power supply across the battery terminals for about 10 secs.
Must be a power supply that can deliver at least 1A.
Then I try the battery on the charger again, quite often it will start charging fine.
How long the battery pack will last for in use is another thing, some are very good, others only last a short time.
But better than nothing !

The best option though is to get yourself one or two lithuim battery packs for the microtac phones. You will need the correct EP charger for these though. And the lithium batteries are hard to find. But they last very well !

Cheers, Chris.
spectreman
 
Posts: 276
Joined: 2013 Aug 31, 23:10
Location: Australia

Re: Motorola 6 volt battery

Postby oldmobil » 2014 May 23, 10:03

Hello,

Yesterday I managed to convert an old 6V battery to AAA holder. I had a late Ni-MH
battery (SNN4836A) what was a little bit thicker than standard SNN4102C Ni-Cd or
a standard SNN4239C Ni-MH. When I opened it I suprised, because I found five
AAA cells instead F7 like prismatic cells. (I used cutter, and opened it from bottom.)
I bought a four piece holder and a single holder for AAA cells and cutted their
bottom then glued with expoxy glue to the case. I soldered wires to the flexibile
pcb. I cut off the original thermal sensor of the battery pack, to save space
so I couldn't use original XT charger, but I can use my Voltcraft processor
controlled charger to charge AAA cells individually.
Image
Image
Image
Image
Image
Image

Regards,
Peter
User avatar
oldmobil
Site Admin
 
Posts: 167
Joined: 2013 Mar 21, 11:01
Location: Budapest, Hungary

Re: Motorola 6 volt battery

Postby Goochy » 2016 Jan 28, 23:44

I need either new replacement batteries for motorola microtac 5200 and 7200 international or someone who can replace the cells and supply a new charger if needed. Obviously I am willing to pay. :D cheers
Goochy
 
Posts: 9
Joined: 2016 Jan 22, 14:31

Re: Motorola 6 volt battery

Postby TheMaritimeMan » 2016 Apr 29, 21:32

Oldmobil, thanks so much for the detailed pictures. I have five MicroTAC batteries; all of them dead, and some of them starting to show corrosion on the terminals, meaning the cells have ruptured inside. I have a knockoff dremel tool, so I'm hoping to be able to cut all of them open and convert them to use removable cells.
TheMaritimeMan
 
Posts: 75
Joined: 2013 Dec 08, 05:58

Re: Motorola 6 volt battery

Postby spectreman » 2016 Apr 30, 04:16

Hi.
This is a good way of replacing the cells in Microtac batteries.
I would personally replace the cells with solder tab nimh cells, not removable ones.
Then would use the original Motorola Intellicharge XT charger, which is ok for nimh cells.
You certainly cannot prise apart the Microtac battery packs, just end up breaking them.
Cheers, Chris
spectreman
 
Posts: 276
Joined: 2013 Aug 31, 23:10
Location: Australia

Re: Motorola 6 volt battery

Postby TheMaritimeMan » 2016 May 03, 03:44

Today I successfully cut open a medium-sized MicroTAC battery with my dremel. It was a clean cut with no damage, which is great. the medium-sized battery has five AA cells inside.

Now I need to figure out what I'm going to repack it with. AA's fit wall-to-wall, so I can't fit provisions for removable AA cells in it. I could fit provisions for removable AAA cells, but that almost seems like a waste of a larger battery. I might be able to fit one or two 9V batteries in there - I do believe these phones can handle 9V.

I guess the best thing to do really is to buy tabbed NiCD cells on eBay and solder them in. I had to destroy the circuitry that sat on top of the cells to get to them, though. It consisted of a resistor, a couple of diodes, and what I assume was some sort of thermistor. Is that circuitry required for the charger to work, or will it still charge properly? If not, I guess I can still charge the battery using an outboard charger.

So many variables...
TheMaritimeMan
 
Posts: 75
Joined: 2013 Dec 08, 05:58


Return to Phones

Who is online

Users browsing this forum: No registered users and 6 guests

cron

www.mobilecollectors.net - admin@mobilecollectors.net (c) 2013