The archives and microchip lists intelligent battery chargers.  I need =
something simple and dont want to re envent the wheel, blah, blah...

The truth is that I know to little about batteries to even try at this =
stage.=20

Can someone help me with a schematic and code to charge a 12Volt buckup =
battery?

The buckup battery is for a system that must generate SMS mesages via a =
GSM module even in the event of a power failure.

The PIC must also generate a message when the battery needs replacement.

I am using a 16F628 but can go to other PIC if A/D is essential.=20

I see that the smart chargers measures the charge current, battery =
temperature etc., but I dont know if the comparrators might be enough. =
Start the charge whenm the battery ia below a certain voltage(?) and to =
stop the charge when the battery reaches a certain voltage(?)

I also dont know if it is best to run the system from the battery =
constantly or if I must switch to battery in the case of a power failure

Thanks

Francois Robbertze

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