Safe battery charging?

[keymuu]

When Ingvar replied and your response had this in it

I guess others did not want you telling them they do not have enough experiance to answer you question.

You could search the forum:
http://www.picbasic.co.uk/forum/show...ttery+charging
http://www.picbasic.co.uk/forum/show...ttery+charging
http://www.picbasic.co.uk/forum/show...ttery+charging
http://www.picbasic.co.uk/forum/show...ttery+charging
http://www.picbasic.co.uk/forum/show...ttery+charging
http://www.picbasic.co.uk/forum/show...ttery+charging

Not all of the above talks about your battery arrangement...but you have not told the type of battery you are using, you only told the package size.

But to answer your first question about charging.
Use a constant voltage with an amperage limit for the amount of cells in the system. As the voltage of the battery increases the amperage will naturally drop, giving a taper charge to finish. When the voltage is reached have the system shut off. That simple. All the other methods are just a bunch of hooy.

Dave, thank you so much

I do not know now with what words I have been searching the forum, but obviously with wrong ones

I have been googling around and found for ex. those MAX712 but I do not trust an application note when there seems (to me) to be errors (npn-pnp). Is it really so? Can't believe that such a big company as Maxim Dallas could have such an error. That is why I asked if somebody has any experience with such a charger (around the MAX712).

I read through all the links you kindly provided, thanks again for the links.
In one of the links there was an idea of charging each cell (battery) separately when they are connected in series. That is interesting and sound really safe, but will more complicated to build the more batteries you have, so maybe it is just a good idea to forget in normal cases.

You asked what type of batteries. And you are right, I have forgotten to tell that, sorry
They are NIMH, Sanyo AA (HR6) batteries 2700mAh each.