jd n,
What part of the state that looks like the back of your left hand or the front part of your right hand are you from? I grew up in south of Deeetroit (Ecorse/Taylor) went to WMU thru '67 & didn't meet Tim Allen (Tool Time).
Those folks that promoted opportunity charging, mainly GNB brand, gave up that ghost about 6-7 years ago. They found that battery life got a lot shorter and silently stopped promoting the "opportunity" charge benefit. Back to the basics on industrial batteries - a new battery is born with "X" number of charge cycles (commonly folks - the battery experts - will say 1400 to 1600.
Then there is the fast charger folks that claim the can recharge a battery faster & cooler but when asked what kind of battery life can you expect you get total silence or the blank stare of a deer in headlights or both.
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