Einhell Pxc 4.0Ah Starter Kit Cordless Drill  (12 mm Chuck Size)

I use it together with another battery an a GE-LC 36/35 chainsaw. Provides enough power, the chainsaw is powerful, with 2 4ah batteries i can tream 3 or 4 big trees (or many many more branches). For 20 olive trees i have to charge it 2 or times, not a problem if you have electricity near you. Useful also for cutting firewood.