But I need a cheap charger to charge them, because I have one charger those included in DX kits (very cheap 2 bay charger with bad algorithm). That charger overcharges to 4,3 volt, which I consider a high risk...
I need a charger which will not explode the batteries due to overcharging above 4,20 volts.
I really don't think you should attempt to do Li-ion on the cheap.
Personally I wouldn't risk using recovered unprotected lap top batteries in combination with an elcheapo charger, to me id rather spend a few extra bucks than play around with a potentially dangerous set up.
ultrafire from lighthound. about twelve bucks. I use mine for charging rcr123, 18650s. and 26500s. I just made some wires to connect and clamp them on. Works perfect for me