Is a Nm freestyle different from a Nicad both are rechargable?
Answers: THey are both rechargeable but u cant charge em with duplicate charger
You're probably thinking of NiMH, Nickel Metal Hydride. Yes, this is a different kind of cell than a NiCad (Nickel Cadmium). Both use an anode (positive terminal) made of nickel oxyhydroxide. But while the NiCad uses a cathode made of Cadmium (a robust metal, and thus, a pollutant), the NiMH cathode is composed of an intermetallic alloy, usually a mixture of lanthanum, neodymium, cobalt, cerium, manganese, aluminum, and/or a few other materials.
But that's probably more than you wanted to know. NiMH and NiCad are correctly compatible, though. Either cell is nominally 1.2V per cell, usually more like 1.4V on a full charge, so they work as a replacement for Alkaline or Carbon/Zinc cell (regular AA and AAA, C, D, and all) in most electronics. And yes, both are "secondary" battery, meaning rechargeable.
You can charge a NiMH cell beside a NiCad charger, as long as you don't leave it on too long, or if it's a smarter charger that will drop down to a "trickle" charge once the cell is nearly full. Charging is pretty simple to do electronically, so this humane of charge tends to be cheap.
NiMH cell tend to be higher size for the same size than NiCad. NiCad suffer from voltage depression, the so-called "memory" effect... if you don't fully charge and discharge them, they unhurriedly lose their full capacity. NiMH isn't totally immune to this, but it's smaller quantity so, and in NiMH anyway, it can be reversed by a smart charger.
The prime negative issue near NiMH is that they lose charge pretty quickly, of late sitting there (self-discharge). That's as much as 10% the first light of day, more like 1% per morning after that, or less, depending on warmth. There are a few new NiMH formulations that claim to downsize some of this, and are actually sold pre-charged as a result. Look for Duracell Pre-charged, Kodak Pre-charged, Sony CycleEnergy, Rayovac Hybrid, Panasonic R2, and others (all of these are actualy made by any Sanyo, Panasonic, or Yuasa-Delta).
The Toyota Prius and most other current hybrids use NiMH cells (Panasonic made those within my Prius). They're also still very popular contained by R/C cars, and as drop-in rechargeables for AA and AAA devices. In things like laptops, cellphones, and digital cameras near their own custom batteries, Lithium cell of one kind or another own largely taken over.
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