"Tom" wrote in message
...
Hi All,

I've been aiming to buy a new car battery trickle charger for a
while
- I've noticed that there are some very small trickle chargers that
are 500mA output and looks like a plug in power block.

Then I found I had an old adaptor from a defunct jump start unit -
the
jump start was a yellow Rolson model for jump starting 12v car
batteries - but the charger that came with it is, strangely enough,
labelled 15v 500mA.

A subsequent jump starter (same yellow model, different branding)
had
a charger that was labelled 12v. Both these jump starters have gone
west and I no longer have them.

Therefore could I use this little 15v/500mA charger as a trickle
charger for my car battery, like the block trickle charges I've
seen?
If so I think all I would need is a couple of large crocodile clips
to
put on the lead - but for charging purposes which goes on the red
positive battery terminal ?

I have a feeling that the charger's negative goes on the battery's
positive terminal and the charger's positive goes on the battery's
negative terminal. Is this right?

Thanks, Tom

No! negative to negative and positive to positive or your wall wart
will be history pdq

AWEM