For interest, the prefix refers to the chemistry and the numbers describe the 
nominal dimensions in mm.
So:
ML = Manganese Lithium (rechargeable)  (3V)
MT = Manganese titanium lithium (rechargeable)  (1.5V)

and 621 = 6.8mm diam x 2.1mm thick.

This system is reasonably consistent for coin cells from all but US 
manufactures.

ian

> Date: Wed, 7 May 2014 15:53:52 +0200
> From: mike cook <michael.c...@sfr.fr>
> To: Discussion of precise time and frequency measurement
>       <time-nuts@febo.com>
> Subject: Re: [time-nuts] Battery Part # For Motorola M12+T ???

> 
> 
> Le 6 mai 2014 ? 21:56, Pascual Arbona Lopez a ?crit :
> 
> >    The model is MR621  (Panasonic)
> 
>  Mine are marked ML621 
> 
> > 
> > 
> > ----- Original Message ----- From: "Jason Rabel" 
> > <ja...@extremeoverclocking.com>
>
> > Subject: [time-nuts] Battery Part # For Motorola M12+T ???
> > 
> >> As the subject says, does anyone know what the battery part # is for the 
> >> Motorola Oncore M12+T ???
> >> 
> >> My GPS module has the socket, just missing the battery.
****
                                          
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