[Leica] more info on the M9 3rd party battery mystery (kyle cassidy on the LUG)

[hopsternew at gmail.com (Geoff Hopkinson)]

The originals at least, are Lithium Ion batteries. As an aside maybe of
interest, the battery for the current M (typ 240) consists of two of the
earlier assemblies combined in one case. The current source is marked as
Leica Camera Korea.


Cheers
Geoff
http://www.pbase.com/hoppyman


> ---------- Forwarded message ----------
> From: kyle cassidy on the LUG <leicaslacker at gmail.com>
> To: lug at leica-users.org
> Cc:
> Date: Fri, 27 Feb 2015 11:58:53 -0500
> Subject: [Leica] more info on the M9 3rd party battery mystery
> So .... I'd bought four 3rd party batteries for the M9, all of which had
> more mAh's than the 1860 that the OEM batteries have -- "how cool I 
> thought,
> they'll last longer" -- this is the case with 3rd party batteries of larger
> capacities that I have for Nikon & Panasonic cameras.
>
> Imagine my surprise when the non-OEM M9 batteries showed to be dead in the
> camera after a few minutes or hours, imagine my greater surprise when I
> tested these dead batteries that couldn't power up the camera with a
> volt-meter and found them nearly fully charged.
>
> Based on input from a lugger, I tried draining the batteries completely,
> then recharging them to 100% and putting them in the the camera -- where
> they worked perfectly and lasted longer than the OEM battery.
>
> No idea why this happens, well, I have some idea, but it's all vague.
> Thoughts from electrical engineers?
>
> (additional news: someone just right now told me that the m9 sometimes
> erroneously reads "the battery state readout" and that pressing "set" when
> you get the "battery dead" message will recalibrate this)
>
> (additional additional news: someone else just forwarded me a thread from
> preview where people are reporting the exact same problem with OEM
> batteries. The plot thickens.)
>
>
>