I also think there is a temperature sensing terminal on the battery that the
charger needs to see before it will apply a charge. At least there is on my
Hitachi charger. So unless you can simulate a real battery in the charger
socket you will get zero volts on the two battery terminals.
Maybe some small wires jammed in along with the the battery will allow you
to determine the charging voltage being applied to the battery. Of course I
take no responsibility for the small wires going hay wire and causing the
charger to assume either the dead or fire mode that David mentioned ;-}
Arvid
-----Original Message-----
From: David Scheidt
Sent: Wednesday, December 22, 2010 9:47 AM
To: john niolon
Cc: shop-talk
Subject: Re: [Shop-talk] dewalt battery charger testing
On Wed, Dec 22, 2010 at 10:25 AM, john niolon <jniolon@bham.rr.com> wrote:
> I'm having trouble charging Dewalt batteries... some it may be old
batteries
> but I'm wondering if my one hour charger is dying... B Dewalt 9107 B one
hour
> charger B when I put a meter across the contacts down in the charger I
> read
NO
> d.c. voltage. B although the battery is getting warm and slowly taking a
> charge... I had a completely dead 12v battery and started charging it with
a
> hotter power supply 26volt B for a few minutes... it came up to about 8
volts
> and I then stuck it in the 9107.... B 4 hours later it's up to about 10
volts
> ??? B This is a 2.8 amp charger and should do better than this...
B discounting
> a bad battery pack... how can I test the charger ???
>
As i recall, that's a multi-voltage charger. The batteries have
terminals that tell the charger which voltage they are, depending on
how they're wired. I have no idea what the pinouts are, but I'll say
this: if it works at all, it's fine, and your battery is shot. (There
are basically two failure modes with this sort of battery charger:
dead, and fire.) Test it with a known good pack. If you don't have a
known good pack, tis the season for good deals on new drills...
--
David Scheidt
dmscheidt@gmail.com
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