I got a portable radio w/ rechargeable battery that didn't come with the
recharging adapter. The radio states to use a 6V 200mA adapter. How
critical is the 200 mA value. I've other 6V adapters but all are > 200mA.
Will it damage the battery or radio?
No. An adapter with more than 200mA is like a bigger glass of water
than one asks for. The battery will only use as much as it wants.
OTOH, I would hesitate to use a higher voltage than recommended.
And polarity is important, essential. I bought as a spare to use for
other things a universal (multi-voltage, multi-plug) power supply
adpater for digital video cameras. Other than cutting and reconnecting
the wires, it has no way to reverse the polarity and for all the
things I have, none of them video cameras, the polarity is backwards.
I haven't been able to find out if digital video cameras actually have
that polarity, or maybe that's why the charger were sold from a shlock
outlet and not at video stores.
The 200ma ought to be a minimum value. Of course it is possible that the
charging circuit is so cheesey that the impedance of the dongle is
actually what limits the charging current, in which chase the battery
could overheat and leak, or even explode. So try it. If it works, you
will have achieved frugality. If it doesn't, the thing was a piece of
Contrary to what others have said the voltage present at the
radio could be critical. It depends on what is in the radio. Some IC's
have voltage maximums that may be reached by some 7.5 volt poorly
A rechargeable battery should not be overcharged. Heat from
overcharging/overvoltage will damage the battery. 7.35 charging
volts is maximum.
A well regulated 6 or 7.5 volt DC adaptor of any current rating
of 200 ma or above will work as far as the radio is concerned, but if
you run into a poorly regulated adaptor the voltage could be 1.414
times higher than what the adaptor is rated.
If you have a few spare adaptors laying around first check that the
marked ratings are at least what the radio calls for. Then measure
the no load voltage to make sure it is under 8 volts for the radio or
under 7.35 for the batteries. Even some 6 volt adaptors can measure
more than 8 volts with no load.
If you're recharging internal battery, the value might be important. Depends
on the design of the radio. The 200 mA limit may limit how fast the
batteries get charged.
If you're using the AC plug to run the radio (play music and news; not
charging internal battery) then higher mA won't hurt anything. mA is power
available, not necessarily power used. For example, you can plug a 1 amp
table lamp into a 20 amp socket, and the lamp uses what it needs.
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