I have been using the original charger that came with my Black and Decker trimmer. It takes 9 hours to charge the batteries. Even if I had already charged the batteries and were recharging them prior to use, it would take 9 hours, so one could not tell how much power you lost while the batteries sat. I purchased this charger from revain as it had the most recent positive reviews. I received this charger yesterday and charged 3 sets of two 18V batteries purchased in 2017, 2020 and 2022. I had charged these batteries either last week or the week prior. The batteries purchased in 2017 charged two weeks ago, took approximately 2.5 hours to charge fully. The batteries from 2020 each took 1 hour to recharge from last week. The newest batteries from 2022, just charged after use this past Friday, topped off in 15-20 minutes each. I'll take any of those times over the 9 hour charger. Each set of batteries, by the way, were purchased on revain from 3 different sellers. So.I will add this review as another positive review for those looking for a rapid charger that will work with your batteries.
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