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1 hour NiCd Batter Charger, is it SAFE and will it LAST ?? (on cordless drill etc)?

I notice more and more cordless drill that use the good-old NiCd Battery Packs have 1 hour charger.

Check out the following links:
http://www.toolbarn.com/product/panasonic/EY503B7658/ or

http://www.mytoolstore.com/dewalt/dew09-02.html

As far as I know the recommended charge is 10% of the specified Amp capacity over 15 hours.

My question is, is this safe, and will the battery last?

Or do they have any special circuit to handle high current charge, and/or automatic shut off when full?

They are as safe as any electronic device and will last just like any other electronic device. You can charge a NiCad battery at what is called the C rate (specified amp capacity) as long as you can sense and state of the battery and shut the charge off when the battery is full. The C rate is the 1 hour current rate. Damage to the battery would be from heat boiling the electrolytic out of the vents in the battery. How long the battery will last depends more on how it is used rather than how it is charged. I used to maintain a fleet of hand-held radios with fast chargers. The batteries typically lasted over 3 years. NiCad's should be good for 1,000 charge/discharge cycles and these batteries were getting that plus a little.

You can charge a NiCad battery indefinitely at 1/10 C rate. The current at this rate doesn't get the battery hot enough to hurt it.

A 1 hour charger would have to have the circuitry to shut off the fast charge and switch to the slow charge rate when the battery reached a certain point. They typicall have a heat sensor, which helps detect bad batteries, and a voltage sensor to determine state of charge. I have used fast chargers for over 30 years with good results.

The popularity of the fast chargers is due to the fact that people who use the tools for work can't wait for 15 hours to charge the battery. Even if they had an extra set, it still wouldn't work. You would need at least 5 or 6 batteries and chargers if you were charging them at 1/10 C just to keep a charged battery in your drill. By charging the battery in 1 hour, you can keep going with just 2 batteries.

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