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What are the differences between NiMH and NiCD batteries?
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.
What is an niMH battery?
nickel metal hydride; slightly higher voltage than Ni-Cd (Ni Cad, or Nickel Cadmium) and better for high current/high draw applications. Pre-2005 NiMh batteries had a higher self-discharge rate than those of today, which are typically purchased pre-charged. Li-ion (Lithium Ion) is probably a better rechargeable battery all-round.
What instrument is used when performing a high-rate discharge test on a storage battery?
A voltmeter and an ammeter
How long it will take to discharge a 9ah battery at the rate of 30ma?
9 / .03 = 300 hrs
How long to charge a 7.2V NiMH battery?
It typically takes around 1-3 hours to fully charge a 7.2V NiMH battery, depending on the capacity of the battery and the charging rate of the charger being used. It is important to follow the manufacturer's guidelines for charging to ensure optimal performance and safety.
Do high capacity batteries last longer on charge?
The discharge time of a battery depends upon its Ah. capacity, Load current & rate of discharge. If a 150Ah battery rated for 10hours is discharged at 15A rate it should last upto 10 hours if the temperature and specific gravity of the electrolyte (in case of flooded type batteries) are within specified limits. If the same battery is discharged at 12.5 A it will last upto 5hours. 1. As the discharge rate increases the capacity of battery decreases. 2. As the temperature increases the capacity of battery increases.
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 is the difference between 9v1 and 9v2 batteries?
The main difference between 9V1 and 9V2 batteries is their capacity and discharge rate. The 9V2 battery typically has a higher capacity and may provide longer-lasting power compared to the 9V1 battery. Additionally, the 9V2 battery may have a higher discharge rate, allowing it to deliver more power in a shorter amount of time.
How do you calculate battery amp hours?
C/20 is the formula most commonly used to describe a battery according to its amp hour rating; for instance a 400Ahr rated battery means that a 20 amp load placed upon the battery delivers at that rate of energy for 20 hours upon reaching the manufacturer's per cell rating, usually about 1.7 volts or 10 volts for a dead, discharged battery. There are different discharge or load ratings such as a 10 hour or 100 hour rating resulting in a different Amp Hour rating for the very same battery. A battery is an electrical potential energy source whose capacity (amount of energy density delivered over time) is determined by the rate/time over which the battery will deliver a set rate of load/discharge. The lesser the load, the longer the rate, the higher the load the shorter the rate.
How many hours will a 46 Wh battery last?
The time a good battery will last generally depends on the rate of discharge. There is a fairly handy way to find out if you have a bit more information. The DigiKey battery life calculator can easily be found on the web.
Is specific gravity of lead acid cell often used as a measure of its rate of discharge?
rate of discharge
What the different between c10 and c20 rating of battery?
The c rating is known as the coloumb rating and indicates the rate of discharge that is recommended. A c10 will last for 10 hours with a 15 amp load, and a c20 will last for 20 hours on a 7.5 amp load. Ideally, the c10 is used in situations where you will have more charge/discharge cycles on the battery and a c20 is for high charge and discharge rates.
