I just got a cordless drill (12v Hitachi) for the first time. Can the
battery be left in the charger continuously (like a cordless phone) so
that it's fully charged at all times or would this damage the battery
or charger? The only thing I know about the battery/charger is that
it's a Ni-Cad battery and the charger has an indicator light that turns
off once the battery is charged.
Better chargers charge and then go into a maintenance or trickle mode.
Yours may simply shut off and stay off until you remove and replace the
battery. I would check the Hitachi site and review information that may be
available. Or contact Hitachi.
Don't know about the Hitachi charger, but it is best to
treat them all as suspect. They may say they will turn off
or only allow a trickle, but you can never tell. First step
is to find out what the charger information says. Second
step is to find out the time for a full charge, then never
charge for longer, and disconnect after the charge. I have
a friend who charges only when he needs the drill.
Personally, I charge from time to time based on what a full
charge time is and the volt reading; i.e. if a full charge
is 5 hours, then I charge for maybe 3 hours if the voltage
is below 12.5 volts, a full charge (allowing time for the
battery to settle down) is about 13.1 to 13.2 volts. For a
12 volt pack you will have 10 cells. Whatever you do, do
not let the pack get below 10 volts (1 volt per cell) and
never always be wary of overcharging.
I had a friend who lost his entire wood shop due to one of these "battery
chargers" that caught fire. Happen again? Probably not but I do not leave
my chargers turned on. You might consider putting the charger on a line
that gets shut off every nite. I always shut off my compressor line at the
fuse box along with the bench outlets, every nite. Throw the breakers and
lock the door.
Radial Arm Saw Forum: http://forums.delphiforums.com/woodbutcher/start
On 22 Dec 2004 17:24:45 -0800, email@example.com wrote:
you shouldn't have to, but if your manual doesn't say "don't", then it
should be ok..
I have 3 19v batteries and I usually have one on the charger for an
hour or so during the day, then pull it out... not taking any risk
that I don't need to with a $55 battery..
Please remove splinters before emailing
Borg has a little timer switch you can mount in a double electrical box with
an outlet and cord. Crank in the time for a full charge, or maybe less if
you haven't used the battery much, and let 'er go. Then you don't have
anything to remember and there's always a hot battery waiting.
I leave my 12v Hitachi batteries in and yes, the charger does shut off.
The red inicator light goes out after an hour or so. I have several
UC12SD chargers both in the shop and in the telco closet at work and
have never had a problem. They make some great cordless tools for the
price. My 12v impact driver has been put through torture for the last
year and it runs like new even if it looks kind of rough. I'd really
like another 12v flashlight but can't seem to find one without buying
Thanks for all the replies. As someone suggested I did call Hitachi
and they told me the battery can be in the charger continuously; they
said it stops charging based on temperature (I suppose of the battery)
and then will monitor the voltage in the battery and will begin to
charge again when/if the voltage drops. (just as SH observed)
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