Excellent technology for cordless tools.
I recently found a Black & Decker 20v MAX cordless drill laying on the street. It had a few scuffs on it and the battery was a couple of feet away so it must have fallen off of someone's vehicle. Although the battery is holding its charge nicely, we all know they eventually run down and need to be recharged, so I needed to find a charger. The most cost effective solution turned out to be this battery and charger combo. The charger is very compact and will charge the battery in three to four hours, depending on how far it is discharged, and has the requisite protective circuitry to prevent overcharging. Using the same technology as batteries for laptops and cell phones, the lithium ion battery pack itself is compact and relatively lightweight compared to the bulky nickel cadmium battery packs my older 18v cordless drill uses and it also lasts longer. And unlike NiCad batteries, lithium ion batteries don't develop a 'memory effect' if subjected to repeated shallow charges, that is, recharging before it's completely depleted; in fact, the instruction booklet recommends putting the battery on the charger after each use and keeping it there until the next time you need it. That way, you always start out with a fully charged battery, thus minimizing the frustration of running out of juice halfway through a project. And with the second battery that came with this charger, I can now run one down, swap in the other one and keep going while the first one charges.
Verified purchase: YesCondition: Pre-owned