Battery Operated Lawn Mower

I've been wanting to try a battery operated lawn mower out for some time now but not wanting to fork over the cash.  They can be quite expensive.   I found a slightly used Black and Decker 36 volt model in really good condition a few months ago on sale foe $200.00.  I was unwilling to drop $200.00 on a used model so I waited.  Yesterday I talked the store into letting me take the risk of buying it for $50.00.  I tried it out last night on various lengths of grass.  Even though I had not recharged the battery, nor sharpened the blade; the mower cut through the thickest, highest grass with no problem.  I like the safety of the blade coming to a complete stop as soon as the off/on switch is released as well.  The system has more than enough power for the mulching system.  I have to give this model a big thumbs up in performance and not just because it was only $50.00.  It would be a good buy at full price.  Couple the performance with not blowing out gasoline exhaust and the noise of an internal combustion engine.  It is a win all the way.  Black and Decker has redesigned the unit to a 40 volt lithium battery which I am guessing will perform even better.  Home Depot carries another model which at 56 volts is the most powerful model of it's type.  But at $500.00 it is a big investment.  I also have a battery operated weed trimmer.  I could not be happier with it's performance going on 3 years.  Not polluting, less noise, no oil changes or fuel spillage, and no engine overheating with these units.  A greener way to go.