I assumed that it needed a molded battery unit but the main gist was that if
you made your battery pack and polarized it wrong that it probably wouldn't
hurt it.
> -----Original Message-----
> From: owner-classiccmp_at_classiccmp.org
> [mailto:owner-classiccmp_at_classiccmp.org]On Behalf Of Chuck McManis
> Sent: Saturday, May 05, 2001 8:45 PM
> To: classiccmp_at_classiccmp.org
> Subject: RE: + and - on HP21 calculator?
>
>
> Ah but the battery box is designed to take the molded HP battery unit,
> which plugged into the back, rotated down and latched into the top (see
> <http://www.home.mcmanis.com/hp21-back.jpg> for a picture. Since it would
> be "impossible" to connect it backwards its possible the HP engineers
> dismissed that possibility and said fine this will never come up.
>
> --Chuck
>
> At 08:22 PM 5/5/01 -0500, you wrote:
> >In reverse shouldn't hurt it, just as if you put AA cells in a radio and
> >they were backwards. Transistorized equipment is polarized to work so my
> >guess is that it wouldn't hurt it. Charging them backwards might though.
>
>
>
>
>
Received on Sat May 05 2001 - 21:21:26 BST
