Louis S. Halikman, M.D. wrote:

> I have a little problem...
>
> I've been running my 10" LX200 in the field with a "Car and Driver" 12V
> battery pack designed for jump-starting a dead car battery. It is
> connected to the scope by way of a 12V to 18V inverter. This
> arrangement has been most satisfactory.
>
> However, the wires connecting to the charging transformer have broken,
> and I need help in making a substitution.
>
> The charger that came with the gadget is a 15V 500 mA transformer.(Not a
> typo -- it really is 15V.) I have one that looks identical (salvaged
> from an old cell phone) that is 12V 700 mA. Polarity and connectors are
> identical.
>
> Is this a safe substitution? The battery is a sealed lead-acid unit.
>
> Any help would be most appreciated. Thanks, MAPUGERS, Lou

I would try to fix the transformer's wires if possible. The cell phone
transformer will not charge you battery because the voltage is too low.
On a 12 volt battery you usually charge at 14.4 to 15 volts and keep it
on a standby voltage of 13.5 to 13.8 volts so, the 15 volt transformer
is correct.

Scott
La Crescenta, CA

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