verifying voltage of wall chargers--all types (and Olivetti Logos 9)

[Hiwi]

Hi,
i have a full working adapter and with no load i measure about 15V, with load 11V.
My nicd battery was dead and i replaced with NIMh cells with 250mA (original 110mA).
The logos 9 has a special charging circuit which limits the current to around 10mA and cuts off at somewhat 9,4V - 9.8V.

I think the charging characteristics Nicd vs. NimH differ a bit, so i could not fully charge the new battery. The cut off is to early to get the battery full. I tried with a diy circuit (LM317) regulated to 11,6 V and later 12,2 V, this works better, but current is limited to 10mA.
So it takes 3 days to recharge the battery!

I have to make further investigations on the charge circuit and modify it.

On my other Logos 9 i have resolderd the battery connections so that the charger socket is directly connected to the battery. I had to add a shottky diode, because the plug did a short when plugging in. Now it works correct.

The new battery lasts longer, i think twice the time.

My Logos 9 has an standby current of 900uA so it is empty after 8-10 days.

I had some other Logos 9 for repair, they always had none working clocks. In most cases the crystal had to be replaced. And often the soldering of the smd parts were weak.
I replace the two electrolyt capacitors in wise foresight :-)

Ralf