Bests & Worsts Reviews from Amazon

I bought this product from my local "bigbox" store a month ago so thought I would drop a review here anyway. The LST220 came with two 20volt lithium ion batteries, a charger, and a leaf blower. I am not the least big mechanically inclined, but I put this wonder together in a few minutes. Batteries each take a full 8 hours to charge, which is a drawback for me, since they only gave me 20 minutes of weeding on each battery, and take 8 hours to charge each one. This unit's height can be adjusted with the quick easy turn of a collar, and the (.065) line is automatic--so no more bump & feed! It is so lightweight and easy to use, and I really do love the fact that I don't have to mess with pulling that nasty string a dozen times on a smelly gas-powered trimmer any more. With this model, all you do is push a button! The only cons would be that the battery lasts me 20 minutes of run time, so I get to do about 35-40 minutes total weed whacking using two batteries. Quite honestly, I can't stand doing much more than that anyway, but I called B&D to verify this, and was told that 20 minutes' run time is the best that I can expect to get for each battery. When I asked B&D why they don't make one with a longer battery life (an hour per battery would be good) I was told that it would make the unit much too heavy (huh??). An electric (corded) weed trimmer is not an option for me since I would have to have an 800ft. cord. I gave it 4 stars instead of 5 only because of the short battery use; a quicker charge time would be a plus. Otherwise, I really enjoy using it, so much so that I think I'm addicted. Haven't had to change the spool yet, but will update this when I do. UPDATE: By the time I had used this 12-14 times, I was only getting 7-10 minutes' run time from each battery. With 16+ hours charge time, it would take me 3-4 days to complete one small area. It's a shame really, as everything else about this machine is great. B&D told me not to expect more than 7 minutes of use from each battery. I ended up returning this weed whacker, and still looking for a good cordless. For those of you who claim to get 35+ minutes' continuous run time from each battery, I'd like to know how.