I purchased the Weedeater which came with 2 Black+Decker 20 V Lithium batteries. They only last 15 to 16 minutes each. I could not finish my yard. First weed eater I thought the batteries were bad so I returned for a new one. But no, The 2 batteries from this one only last as long as 16 minutes as well. Returned for a refund.
Had these for years and years, used them in drills, a flashlight, the trimmer and hedge trimmer. Batteries last as long as stated by B&D even years later there is minimal loss, never had 1 defect in 8+ years.
I don't get all these cry baby reviews about small capacity batteries not lasting long on high powered garden tools, you don't see anyone grabbing a Milwauklee blower or trimmer and crying when their small 2.0 ah battery doesn't last. No one in their right mind would even pretend to assume a small battery would last long but someone you all do?? That's what the bigger batteries exist for, It's called common sense...
I bought a Black and Decker weed eater that uses a B and D battery. It always ran out of juice before I was through edging. So I found a battery store that sells B and D batteries and I bought another one. Now I have 2 batteries.... edge until the first one runs out of juice, go into the house and get the new battery and and put it on the edger, put the old one on the charger and by the time the new one is out of charge, the old one is charged.....I love it.
Bought trimmer yesterday. It came with two 1.5 batteries. Charged them yesterday and used them today. Each battery lasted 15 min. Need three or four of them at that rate.