Well, it looks like it is charging it with 350mAh charger as well (5 bars already), only slower and the main lesson here is - DO NOT DISCHARGE YOUR PHONE COMPLETELY if you want to use older charger.

Borrowed 890mAh charger from colleague and that worked fine with the adapter, when switched off showed that phone is charging and turned back light on and also managed to turn on the phone.

Now charging trough adapter with 350mAh charger again, will give feedback if additional battery bar shows up until end of the day...

Have you tried to charge your E52 with included adapter and some older chargers?

I completely depleted battery and connected the old nokia charger from 6300 trough included adapter, it does not seem to charge enough to switch on the phone.

I tested it when phone was on, it showed, that it charges, but perhaps to week, do not know.

Output power of original charger is 1200 mAh, old one about 350 mAh, this affects what ?
Charging time or power - will it take 3 times longer to charge the battery or will it charge only one third of capacity and no more?