I have some S107's which I am repairing and needed some replacement batteries. I ordered these
off eBay and they have arrived today - but are marked 180mAh!
I have just fitted one into the standard battery bay and it just fits under the canopy. Charged it up and flew it and it appears to be a really good battery. Bags of power and the first flight was getting on for 5 minutes in 3 bursts. It had discharged to 3.93 volts which is fine for storage.
It also has the overcharge protection board fitted as standard. I reckon that UKP £5.98 for 5 batteries delivered is a good deal even if you have to wait a couple of weeks.