At 07:55 AM 24/11/2010, you wrote:
> > > A NiMH battery should be trickle charged (assume constant current
> > > of a few milliamps, rather than a high current pulse
>
>
> > Panasonic regard trickle charging as the least-preferred method>
>
> >=20
> http://www.panasonic.com/industrial/includes/pdf/Panasonic_NiMH_ChargeMet=
hods.pdf
>
>Actually, somewhat less than "least preferred".
>At best non-preferred.
>See bottom of page 13, left hand column.
>Summary: "Don't do it, see us."
>
> > Duracell are OK with it at C/300
> >
> > http://www1.duracell.com/oem/Pdf/others/nimh_6.pdf
>
>So ghey say.
>Almost nobody reputable says this for higher energy density NimH (say
>2500+ mAh / AA).
>So this comment from Duracell MAY be the marketing left hand not
>taking to the development engineer right hand.
>
>That said, C/300 for a 2500 mAh cell is ~=3D 8 mA and about 12 mW charge
>energy/cell.
>You'd HOPE that this was toleable. Many say that it's not.

Note that they specifically say that the C/300 current is to
compensate for the internal self-discharge current. IOW, it's
_not_ for charging a discharged battery, but for keeping an
already-charged battery topped up.

>Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the rewar=
d"
speff@interlog.com             Info for manufacturers: http://www.trexon.co=
m
Embedded software/hardware/analog  Info for designers:  http://www.speff.co=
m



--=20
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