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A nickel-metal hydride battery, abbreviated NiMH, is a type of rechargeable battery similar to a nickel-cadmium (NiCd) battery but using a hydrogen-absorbing alloy for the negative electrode instead of cadmium. As in NiCd batteries, the positive electrode is nickel oxyhydroxide (NiOOH).
A NiMH battery can have two to three times the capacity of an equivalent size NiCd. However, compared to the lithium-ion battery, the volumetric energy density is lower and self-discharge is higher.
Common AA batteries (penlight-size) have nominal charge capacities (C) ranging from 1100 mA·h to 2700 mA·h at 1.2 V, usually measured at a discharge rate of 0.2×C per hour. Useful discharge capacity is a decreasing function of the discharge rate, but up to a rate of around 1×C (full discharge in one hour), it does not differ significantly from the nominal capacity.
The specific energy density for NiMH material is approximately 70 W·h/kg (250 kJ/kg), with a volumetric energy density of about 300 W·h/L (360 MJ/m³).
It is common to refer to most NiMH products as Batteries, even though the word Battery refers to the grouping of multiple cells. As a result sizes AA, AAA, C and D are technically Cells while the 9V size is a real battery.
A nickel metal hydride (NiMH) battery is one of the more recent evolutions in rechargeable batteries. It is superior to a nickel cadmium (NiCad) battery in almost every way except one. NiMH batteries that are not specially treated have a higher electrical discharge rate when not being used. This means a charged battery drains when not in use quicker than a NiCad battery. In general use, however, NiMH batteries last longer than NiCad batteries.
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Your camera insists to use nimh AA batteries can you use nicd batteries?
yes. NiMH batteries and chargers are easier to come by though. Alot of times, the mAh will be higher in the NiMH batteries as well...so there is really no point to using NiCD unless you'd prefer it.
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.
Will a NiMh charger charge NiCad Batteries?
Yes, a NiMH charger can typically charge NiCad batteries as well. However, it's important to check the specifications of the charger to ensure compatibility and to avoid potential damage to the batteries.
Is it true that if you put a battery in the fridge it will recharge?
No, but refrigerating NiMh/NiCd batteries will increase their shelf life. Never freeze batteries.
Can you use NiCD battery in place of NiMH battery?
No, it is not recommended to use NiCD batteries in place of NiMH batteries. They have different charging characteristics and capacities, and using them interchangeably can lead to potential damage to the device or battery. It's best to stick to the battery type recommended by the device manufacturer.
What are the differences between LiLon and NiMH digial camera batteries?
Lithium Ion (LiON) batteries are lighter than NiMH batteries and also have no memory effect. They are more expensive, but worth every penny.
Why Nickel metal hydride batteries do not suffer quite as much from the memory effect as do nickel cadmium batteries?
Nickel metal hydride (NiMH) batteries have a different internal chemistry compared to nickel cadmium (NiCd) batteries, which contributes to their reduced memory effect. NiMH batteries have less pronounced voltage depression during partial discharges, making them less susceptible to developing memory effect. Additionally, NiMH batteries exhibit better tolerance to overcharging and deep discharging than NiCd batteries, helping to mitigate memory effect issues.
Will a NiCd charger charge NiMh Batteries?
A NiCad charger has different sensor values than NiMh. I would find a charger that has a switch to select either, or specifically a Nickel Metal Hydride battery charger to prevent damaging and shortening the life of your batteries.
What battery technology is directly replacing nicd?
NiMh is usually considered the most direct replacement of NiCd.
Can you use a rechargeable NiMH battery in a wireless mouse?
yesYou can use a NiMH battery in just about any application you would use a normal alkaline battery. However, NiMH batteries do not perform well in low energy applications - they are designed for use in high energy devices like digital cameras. For things like clocks, standard alkaline batteries are better suited.In my personal experience, the NiMH and NiCd batteries did not perform as well in my wireless LASER mouse. Alkaline batteries performed a whole lot better. The problem is that NiMH and NiCd have relatively high "self discharge" rates; that is, while they are not in use, they will loose their charge over a fairly short time as opposed to alkaline batteries which loose their charge at a much smaller rate and over a much, much longer period. Also of consideration is the fact that rechargeables (NiMH & NiCd) produce 1.2v at full charge (NiMH can achieve 1.4v, but for very short time) whereas alkaline batteries are 1.5v. This 0.3v can be a problem with some electronic devices. 9V rechargeables only deliver 7.2v.
What kind of batteries are NIMH batteries?
NIHM stands for nickel metal hydride battery. The NIHM batteries are similar to other types of rechargeable batteries like the more common nickel-cadmium NiCd types but with much more charge capacity.
How do you know if a rechargeable battery is NiCD or NiMH there are only mAH markings on the batterys and both are 7.2V packs made up of six 1.2V units one is 1600mAH and the other is 3000mAH?
Looks like both are NiMH as NiCd batteries are generally not available for more than 800mAH rating. NiMH are common to have 1600mAH and more rating per AA cell. - Neeraj Sharma
