> -----Original Message-----
> From: newtontalk-bounce_at_newtontalk.net
> [mailto:newtontalk-bounce_at_newtontalk.net]On Behalf Of speedy2
> Sent: Tuesday, April 30, 2002 5:15 PM
> To: newtontalk_at_newtontalk.net
> Subject: Re: [NTLK] Newton battery questions
>
>
>
>
> >
> > >>> tech_ed_at_yahoo.com 04/29/02 04:53PM >>>
> >
> > nope...it's purely manual.
> > What I've done is I leave my rechargeable battery
> > connected to a lightbulb and a resister in series (I
> > forget the value, but it's small...something like 10k
> > but 5 watts) then put the contraption in a box with a
> > hole in it. When light no longer shines through the
> > hole, the battery is dead (I put a red lens over the
> > hole to make it look pretty) then I charge the battery
> > and do the whole thing over again. It helps to have a
> > spare battery (or the "AA" carrier while doing this.
>
> If this is a battery pack(not a single cell), then this is
> NOT a good
> idea.
>
> Discharging the batteries in a pack beyond .6V/cell can
> damage a pack. It
> doesn't look like your system has any automatic cut-off, so
> you can easily
> damage your rechargables, shorten their life, etc.
>
> For the 4xAA back, your min. cut-off should be 2.4V.
>
> Speedy2.
>
Good point, try 2 or 3 rectifier diodes in series with the bulb
(IN4001 or similar) the forward voltage drop should give you a
suitable cut-off point.
(Ensure that the diodes are rated for at least the maximum current the
bulb will draw)
Ben.
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