These batteries are a little more sophisticated than a simple charge. First,
you have to know the recommended charge rate for your battery. You will have
to be able to design the charger to properly cut off when the battery is
fully charged, and then be able to go in to a maintaining state for it. You
will also have to know the recommended average current rate to keep the
battery maintained.

As for schematics of these chargers, there are text books around with
examples of them, but you would have to re-design one to work to the proper
specs for the particular battery.

As for building these types of chargers, I found it more feasible to buy the
proper one for the type of battery being used. This is a safer and more
reliable way to do things. An exception would be if you are designing a
charger for an R&D research project to manufacture your own product.

--

Jerry G.
=====

"Billa" wrote in message
om...
first please forgive me if this is out of topic
....
Sice I lost the original cable I'm trying to find instruction to build
a charger for my digital-camera battery.
It's a DPS-9000 digipower 7,2 Volts ?mAh Li-Ion

I have to find specification/drawings/suggestions to build a device
that will charge properly my battery without making it explode, using
a 15.0 volts dc 800 mAh as input (one of the two components of the
switching power supply has this output, and I've lost the second
component!!)

I hope to find suggestions (any kind) in this newsgroup!

tnx