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Why Nickel metal hydride batteries do not suffer quite as much from the memory effect as do nickel cadmium batteries?
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Is there a difference between ni-cd batteries and ni-mh batteries?
Quite a few differences. Nickel-metal-hydride (ni-mh) batteries: Charge Faster; Hold a charge longer; Have far less 'memory effect'; Last longer; But are generally more expensive. Ni-mh batteries are by far the better choice.
Why is formaldehyde a better hydride donor than benzaldehyde comparative view?
The resonating effect of benzene ring makes the removal of hydride slightly difficult as compare to formaldehyde but benzaldehyde also donates hydride as in Cannizzaro;s reaction.
How does sun effect batteries?
The sun can have a number of different effects on batteries. The sun can for example either drain or charge different batteries.
What evidence led the conclusion that earth core is made of solid iron?
The effect that Earth's gravity has on other planets and the sun can be calculated. This degree of gravity that is demonstrated points to a heavy core that is metal. Fragments of nickel-iron meteorites that are remnants of planetary collisions also indicate that other planets have a nickel-iron core.
The apparent curving of the winds is called?
the Coriolis effect
What is Nickel-metal hydride?
Nickel-metal hydride batteries are a type of rechargeable battery with an electrochemistry similar to nickel cadmium batteries, but the eliminate the toxic cadmium metal.The older nickel cadmium battery uses nickel oxide hydroxide and metallic cadmium as electrodes, while the newer nickel-metal hydride battery keeps the nickel oxide hydroxide electrode it uses a complex alloy that readily absorbs hydrogen atoms forming a metal hydride, it is the absorbed hydrogen within this hydride that actually functions as the active electrode in the battery. In addition to eliminating the toxic cadmium (making recycling or disposal easier and cheaper) this change also provides other advantages: higher battery capacity, no memory effect, etc.Some of the different alloys used in the metal hydride electrode are:titanium nickellanthanum neodymium nickel cobalt siliconcerium lanthanum neodymium praseodymium nickel cobalt silicon
Are mcVolt Li-Ion laptop batteries really better than NiMh and NiCd batteries?
Nickel Cadmium batteries contain Cadmium, a toxic heavy metal, which is harmful to the environment. Nickel-Metal Hydride batteries offer a higher capacity(runtime)per same size(voltage output) than NiCd batteries and mcVolt Litium Ion laptop batteries have a higher capacity than NiMh(those sold by most manufacturers). NiMh batteries are also lighter and have little memory effect compared to their NiCd counterparts. mcVolt Li-ion laptop batteries are light, have a higher capacity and have no memory effect compared to NiMh and NiCd batteries.
Laptop Battery Types?
When not plugged in, laptops require batteries to power the device. Battery types for notebooks can differ. Nickel Cadmium (NiCd) batteries are low in cost, versatile, and the first rechargeable batteries for laptops. Nickel Metal Hydride (NiMH) batteries are significantly better due to improvements in capacity, safety, and reliability. Lithium Ion (LiON) batteries are most popular due to being lightweight and improved memory effect. "Smart" or "dumb" batteries are better at managing battery energy and reporting charge state.
Why do batteries not last as long?
Simply because of the materials they're made from. There will always be degradation in rechargeable cells. Older Nickel Cadmium batteries suffered from 'memory effect' - which depleted their capacity gradually over time. Nickel Metal Hydride batteries don't apparently suffer this effect, and therefore last much longer.
Where do you use Nickel-metal hydride battery?
They are a replacement rechargeable battery where Nickel Cadmium types were used. They tend not to suffer from the 'memory effect'. This is the condition where a cell does not supply it's stated Ampere Hour capacity if it is charged again when part way through it's discharge cycle.
Is there a difference between ni-cd batteries and ni-mh batteries?
Quite a few differences. Nickel-metal-hydride (ni-mh) batteries: Charge Faster; Hold a charge longer; Have far less 'memory effect'; Last longer; But are generally more expensive. Ni-mh batteries are by far the better choice.
What type of the battery has a memory effect?
A few types of rechargeable batteries have what is called a "memory effect". The "memory effect" causes a loss of charge capacity in some rechargeable batteries if they are repeatedly recharged at exactly the same point on their discharge curve. When this "short cycle" discharge then recharge has happened enough times, the battery only retains the charge capacity between full charge and the point it was discharged to, it can no longer be discharged below that and will drop to zero voltage instantly.The most notorious for this problem are nickel cadmium batteries, however even in them it had been shown that normal real world use does not produce a true "memory effect" in them and almost all failures attributed to nickel cadmium "memory effect" were really caused by other mechanisms.
Why is nicad batteries different from regular batteries?
Ni-cad batteries first became popular as portable rechargeable batteries. The "regular batteries" used in cars are mostly lead-acid rechargeable batteries. The "regular batteries" used in toys, remote controls, flashlights and such, are mostly the non-rechargeable types. Ni-cad batteries use nickel and cadmium. The latter is a toxic substance, difficult to dispose of, and ni-cad batteries have a nasty tendency to lose capacity (the "memory" effect). For that and other reasons, makers of lightweight rechargeable batteries have switched to using nickel-metal-hydride or lithium batteries. (Lithium-metal = explosive, lithium-ion = very popular, lithium-polymer = extremely lightweight, lithium-iron-phosphate = next generation for hybrid and electric cars.) The Prius Hybrid uses nickel-metal-hydride battery cells. When weight or size is not as much of a concern, lead-acid batteries are used due to their lower cost. Most automobiles and many industrial uninterruptable power supplies use lead-acid batteries, which are capable of providing several hundred amperes of current for a short time. Ni-cad batteries are rechargeable, regular are not rechargeable.
What has the author John J Smithrick written?
John J. Smithrick has written: 'Nickel hydrogen batteries--an overview' -- subject(s): Nickel hydrogen batteries, Design analysis, Proving, Performance tests, Metal hydrides, Pressure vessels, Energy storage, Spacecraft power supplies 'Validation test of 125 Ah advanced IPV nickel-hydrogen flight cells' -- subject(s): Nickel-hydrogen batteries, Storage batteries 'Effect of LEO cycling at shallow depths of discharge on MANTECH IPV nickel-hydrogen cells' -- subject(s): Batteries (Ordnance) 'Effect of impregnation method on cycle life of the nickel electrode' -- subject(s): Batteries (Ordnance), Electrodes, Nickel, Energy storage, Nickel Electrodes 'Validation test of advanced technology for IPV nickel-hydrogen flight cells--update' -- subject(s): Storage batteries, Nickel-hydrogen batteries 'Effect of storage and LEO cycling on manufacturing technology IPV nickel-hydrogen cells' -- subject(s): Storage batteries
Does a battery last as long when it is recharged?
Ni/Cd or Nickel Cadmium rechargeables and many of the metal hydride batteries recrystallize as they heat and cool due to the action of the electric charge. This affects their ability to store charge. Lead acid batteries develop sulfur based corrosion on their metal plates and this affects their ability to recharge. Lithium batteries don't seem to have this effect to the same degree, but do eventually "age" as in this article (see link below). ----------------------------------------------------------------------------------------------- The short answer is yes, batteries like almost everything else have a limited lifespan. Different batteries have different lifespans and care instructions, so pay attention and choose a battery product with the best lifespan where it matters.
Do you need to let a laptop battery run out?
It depends on the type of battery you have in your laptop.NiCd (Nickel Cadmium) batteries have a sort of memory effect. It is a good idea to cycle (Discharge fully) these kind of batteries as this ensures maximum capacity for longer.NiMhd (Nickel Metal Hydride) does not have this memory effect. They should not need to be discharged fully before being recharged.Memory effect is:The battery "remembers" after a few times of being recharged, when it was recharged. The capacity will then start to drop drastically and begs for a recharge when it reaches the point of where it normally have been recharged before.Example:A battery (NiCd) being at 50% and then recharged will after a few times drop the voltage at 50%. This giving the impression that it is "empty" where it is not really so.Note:The memory effect can be cancelled with a couple of deep discharge and full charge again. The battery is then -revived- brought back to capacity again.
What types of batteries are use for portable computers?
Laptops are powered by several different types of batteries. These batteries provide direct-current power to your laptop.Lithium-ion: This is the type of battery you want to have in your laptop. This type is lightweight and performs better than the other types of batteries. Unlike NiCad or NiMH batteries, lithium-ion batteries don't have the dreaded memory effect." The memory effect is the property of nickel-cadmium batteries that causes them to lose their capacity for full recharging if they are discharged repeatedly the same amount and then recharged without overcharge before they have fully drained. There's usually a rapid-charging option with lithium-ion batteries, which is good when you're in a time crunch. Finally, this type of battery is more environmentally friendly than the other types.Two older types of batteries, once popular in portable computers, are nickel-cadmium (NiCad) and nickel-metal hydride (NiMH). The NiCad isn't often considered for laptops these days because it suffered unpleasantly from The Dreaded Memory Effect. A NiMH battery is longer lasting than a NiCad, but it too woefully suffers from The Dreaded Memory Effect.You can confirm which type of battery your laptop has by looking at its label. See the next section.A few laptop computers out there are still using NiMH batteries. This is fine, of course, but you might want to check to see whether you can find a battery upgrade to the Li-ion type.To prolong the life of a NiMH battery, I recommend fully discharging it every so often. For example, after you use, drain, and recharge the NiMH battery about four times (or so), do a complete drain and then recharge it again. That should help the battery last a bit longer.Your laptop might have two additional batteries inside. A secondary, alkaline battery inside is used to power the laptop's internal clock. An optional third battery keeps things powered for the minute or so that it takes you to swap out a spent main battery with a fresh one. See the section "Love that spare battery," later in this chapter.
