Most of the time for shrubs and trees where I am at ground level I will use loppers but have found these two cordless tools from Black and Decker to be quite good and they use the same 20v rechargeable battery pack that holds a charge for months.
BLACK+DECKER LPHT120B Bare Max Lithium Ion Pole Hedge Trimmer, 20-Volt $95 with battery and charger, bare tool for $52
BLACK+DECKER LPP120 20-Volt Lithium-Ion Cordless Pole Saw $139 with battery and charger or bare tool for $79
Both tools work very well in most situations. I also have a gas powered pole saw for 4" and larger limbs and a pole saw with a hand operated lopper using a rope for limbs more than 12 feet off the ground.
I wanted a more powerful leaf blower and so went from an electric one to a 2-stroke Echo blower and so now use a gas and oil blend that I need to store. I can use the same blend in the pole saw which helps to avoid having the gas go stale.