Who is using A123 batteries for electric flight? How many cells? How are you charging them? What do you think of them? They have come DOWN a lot in price (at least the 1100 mahs) have dropped in price.
A friend told our club about a local Home Depot type store ( Menards ) in the Midwest--USA--. They are selling a two cell pack 1100 mah for $8.00 US. I paid $20.00 for the same pack six months ago. Four cells equals about 12 volts. Heavier than Lipos' but they can be re-charged in half of the time.
You can also get a mail-in form directly from B&D to get a free two cell pack when you buy one of the smaller tools. Or, a two cell pack and charger, when you buy one of the larger tools. Rich