A bit of candle wax or soap on any screws always works.

I bought a 14.4V Ozito about 5 years ago as a backup when i misplaced my good one (lent it to someone who forgot to bring it back)
Up until a week ago all was good then one of the batteries carked it, but the drill has done alot of work without a whimper, so i have never replaced it. Negatives were short battery life, but with 2 charged you could go for a while. I will get a new drill next week, probably a Bosch, but i wouldnt hesitate to buy another Ozito if i need a backup, probably an 18V as i go pretty hard with them.