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What is an NiMH battery?

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A nickel–metal hydride cell, abbreviated NiMH or Ni-MH, is a type of rechargeable battery. It is very similar to the nickel–cadmium cell (NiCd). NiMH use positive electrodes of nickel oxyhydroxide (NiOOH), like the NiCd, but the negative electrodes use a hydrogen-absorbing alloy instead of cadmium. A NiMH battery can have two to three times the capacity of an equivalent size NiCd, and their energy density approaches that of a lithium-ion cell. The typical specific energy for small NiMH cells is about 100 W·h/kg, and for larger NiMH cells about 75 W·h/kg (270 kJ/kg). This is significantly better than the typical 40–60 W·h/kg for Ni–Cd, and similar to the 100-160 W·h/kg for Li-ion. NiMH has a volumetric energy density of about 300 W·h/L (1080 MJ/m³), significantly better than nickel–cadmium at 50–150 W·h/L, and about the same as li-ion at 250-360 W·h/L. NiMH batteries have replaced NiCd for many roles, notably small rechargeable batteries. NiMH batteries are very common for AA (penlight-size) batteries, which have nominal charge capacities (C) ranging from 1100 mA·h to 3100 mA·h at 1.2 V, measured at the rate that discharges the cell in five hours. 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.[4] NiMH batteries normally operate at 1.2 V per cell, somewhat lower than conventional 1.5 V cells, but will operate most devices designed for that voltage. About 22% of portable rechargeable batteries sold in Japan in 2010 were NiMH.[5] In Switzerland in 2009, the equivalent statistic was approximately 60%.[6] This percentage has fallen over time due to the increase in manufacture of li-ion batteries: in 2000, almost half of all portable rechargeable batteries sold in Japan were NiMH.[5] One significant disadvantage of NiMH batteries is a high rate of self-discharge; a NiMH battery will lose as much as 3% of its charge per week of storage. In 2005 a low self-discharge NiMH battery (LSD) was developed. LSD NiMH batteries significantly lower self-discharge, but at the cost of lowering capacity by about 20%.
Posted: 07-06-2012 @ 14:57:46
NiMH stands for Nickel-Metal Hydride, the materials used in some battery packs. Unlike NiCad batteries, NiMH batteries do not use heavy metals that may have toxic effects. In addition, they can store up to 50% more power than NiCad batteries and do not suffer from memory effects. NiMH battery can have two to three times the capacity of an equivalent size NiCd, and their energy density approaches that of a lithium-ion cell. The typical specific energy for small NiMH cells is about 100 W·h/kg, and for larger NiMH cells about 75 W·h/kg (270 kJ/kg). This is significantly better than the typical 40–60 W·h/kg for Ni–Cd, and similar to the 100-160 W·h/kg for Li-ion. NiMH has a volumetric energy density of about 300 W·h/L (1080 MJ/m³), significantly better than nickel–cadmium at 50–150 W·h/L, and about the same as li-ion at 250-360 W·h/L. NiMH batteries have replaced NiCd for many roles, notably small rechargeable batteries. NiMH batteries are very common for AA (penlight-size) batteries, which have nominal charge capacities (C) ranging from 1100 mA·h to 3100 mA·h at 1.2 V, measured at the rate that discharges the cell in five hours. 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.
Posted: 19-05-2012 @ 08:42:02
NiMH stands for Nickel-Metal Hydride, the materials used in some battery packs. Unlike NiCad batteries, NiMH batteries do not use heavy metals that may have toxic effects. In addition, they can store up to 50% more power than NiCad batteries and do not suffer from memory effects.
Posted: 13-11-2011 @ 13:20:43
NiMH stands for Nickel-Metal Hydride, the materials used in some battery packs. Unlike NiCad batteries, NiMH batteries do not use heavy metals that may have toxic effects. In addition, they can store up to 50% more power than NiCad batteries and do not suffer from memory effects.
Posted: 11-11-2011 @ 14:24:28
A nickel–metal hydride cell, abbreviated NiMH, is a type of rechargeable battery similar to the nickel–cadmium cell. The NiMH battery uses a hydrogen-absorbing alloy for the negative electrode instead of cadmium. As in NiCd cells, the positive electrode is nickel oxyhydroxide (NiOOH). A NiMH battery can have two to three times the capacity of an equivalent size nickel–cadmium battery. The energy density of a NiMH cell is similar to that of a lithium-ion cell, but the rate of self-discharge is higher. This means that a stored NiMH battery will lose charge more quickly. In 2005 a low self-discharge NiMH battery (LSD), which stays charged for much longer, was developed. Common AA (penlight-size) NiMH batteries have nominal charge capacities (C) ranging from 1100 mA·h to 3100 mA·h at 1.2 V, measured at the rate that discharges the cell in five hours. 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.[4] The typical specific energy for NiMH AA cells is about 100 W·h/kg, and for other NiMH dry cells about 75 W·h/kg (270 kJ/kg), compared to 40–60 W·h/kg for Ni–Cd, or 100-160 W·h/kg for Li-ion. NiMH has a volumetric energy density of about 300 W·h/L (1080 MJ/m³), significantly better than nickel–cadmium at 50–150 W·h/L, and about the same as Li-ion at 250-360 W·h/L. About 22% of portable rechargeable batteries sold in Japan in 2010 were nickel–metal hydride.[5] In Switzerland in 2009, the equivalent statistic was approximately 60%.[6] This percentage has fallen over time due to the increase in manufacture of lithium ion batteries: in 2000, almost half of all portable rechargeable batteries sold in Japan were nickel–metal hydride.[5] Because non-LSDs do not have an LSD separator, they are cheaper to manufacture than LSDs, yet most are offered at about the same price as LSDs and are marketed as "high capacity" or "ultra high capacity" NiMH batteries. While "high capacity" versions may have an extra 20% in initial capacity (compared to LSDs), this is negated by much higher internal resistance (especially in high drain situations) than LSDs and much higher self discharge rates (20% or more in first 24 hours, plus 4% per day thereafter). This energy wasted on heat and self discharge means these batteries require significant extra recharging which reduces overall battery life. Consequently, with consumer size batteries (AAA, AA, C, D, 9v), the low self-discharge NiMH battery has all but replaced the "high capacity" or "ultra high capacity" non-LSD type. ::::::::::
Posted: 22-10-2011 @ 19:50:17
NiMH battery, the positive electrode is typically composed of nickel hydroxide, hence the name Nickel-Metal Hydride. These batteries are a type of rechargeable battery. They are used for a variety of purposes ranging from digital cameras to hybrid vehicles and industrial applications. The popularity of these batteries has grown in recent years as concerns over the environmental impact of toxic components and interest in recycling have increased. Most NiMH batteries can be recharged several hundred times over the course of its life. They are also subject to very little decline in the overall power output provided after they are charged.
Posted: 22-09-2011 @ 20:24:29
NiMH stands for Nickel-Metal Hydride, the materials used in some battery packs. Unlike NiCad batteries, NiMH batteries do not use heavy metals that may have toxic effects. In addition, they can store up to 50% more power than NiCad batteries and do not suffer from memory effects.
Posted: 22-09-2011 @ 16:26:25
bro A nickel–metal hydride cell, abbreviated NiMH, is a type of rechargeable battery similar to the nickel–cadmium cell. The NiMH battery uses a hydrogen- absorbing alloy for the negative electrode instead of cadmium. As in NiCd cells, the positive electrode is nickel oxyhydroxide (NiOOH). A NiMH battery can have two to three times the capacity of an equivalent size nickel– cadmium battery. The energy density of a NiMH cell is similar to that of a lithium-ion cell, but the rate of self-discharge is higher. This means that a stored NiMH battery will lose charge more quickly. In 2005 a low self- discharge NiMH battery, which stays charged for much longer, was developed. regards vivek
Posted: 21-09-2011 @ 18:05:38
bro A nickel–metal hydride cell, abbreviated NiMH, is a type of rechargeable battery similar to the nickel–cadmium cell. The NiMH battery uses a hydrogen-absorbing alloy for the negative electrode instead of cadmium. As in NiCd cells, the positive electrode is nickel oxyhydroxide (NiOOH). A NiMH battery can have two to three times the capacity of an equivalent size nickel–cadmium battery. The energy density of a NiMH cell is similar to that of a lithium-ion cell, but the rate of self-discharge is higher. This means that a stored NiMH battery will lose charge more quickly. In 2005 a low self-discharge NiMH battery, which stays charged for much longer, was developed. regards vivek
Posted: 19-09-2011 @ 19:47:06
A nickel–metal hydride cell, abbreviated NiMH, is a type of rechargeable battery similar to the nickel–cadmium cell. The NiMH battery uses a hydrogen-absorbing alloy for the negative electrode instead of cadmium. As in NiCd cells, the positive electrode is nickel oxyhydroxide (NiOOH). A NiMH battery can have two to three times the capacity of an equivalent size nickel–cadmium battery. The energy density of a NiMH cell is similar to that of a lithium-ion cell, but the rate of self-discharge is higher. This means that a stored NiMH battery will lose charge more quickly. In 2005 a low self-discharge NiMH battery, which stays charged for much longer, was developed.
Posted: 19-09-2011 @ 16:54:34
Its means Nickel–metal hydride battery.NiMH is a type of rechargeable battery similar to the nickel–cadmium cell.The NiMH battery uses a hydrogen-absorbing alloy for the negative electrode instead of cadmium. As in NiCd cells, the positive electrode is nickel oxyhydroxide (NiOOH). A NiMH battery can have two to three times the capacity of an equivalent size nickel–cadmium battery. The energy density of a NiMH cell is similar to that of a lithium-ion cell, but the rate of self-discharge is higher. This means that a stored NiMH battery will lose charge more quickly. In 2005 a low self-discharge NiMH battery, which stays charged for much longer, was developed.
Posted: 19-09-2011 @ 05:05:54
nickel metal-hydride.
Posted: 18-09-2011 @ 00:44:18
is a type of rechargeable battery similar to the nickel–cadmium cell. The NiMH battery uses a hydrogen-absorbing alloy for the negative electrode instead of cadmium. As in NiCd cells, the positive electrode is nickel oxyhydroxide (NiOOH). A NiMH battery can have two to three times the capacity of an equivalent size nickel–cadmium battery. The energy density of a NiMH cell is similar to that of a lithium-ion cell, but the rate of self-discharge is higher. This means that a stored NiMH battery will lose charge more quickly. In 2005 a low self-discharge NiMH battery, which stays charged for much longer, was developed.
Posted: 17-09-2011 @ 01:38:30
Popular as NiMh batteries, Nickle-metal hydride batteries are secondary (electrochemical cells) in nature and similar to the nickel-cadmium cells. However, for the negative electrode, these NiMh batteries carry a hydrogen-absorbing alloy instead of cadmium. That is why NiMh batteries are better and more efficient companions than nickel-cadmium cells of equivalent sizes. If we compare lithium-ion cells with NiMh batteries then the volumetric energy density in NiMh batteries will be lower and self discharge capacity will be higher.With common AA cells, these NiMh batteries offer nominal charge capacities at a discharge rate of 0.2xC per hour but at a rate of 1xC, there is no significant difference though. In contrast, if we talk about the specific energy density then NiMh batteries are value for money products but not superior than Li-ion batteries. Users who are desperate to replace their non-rechargeable batteries and fervently hunting for a replacement can certainly consider these NiMh batteries as a good alternative. Being a safer product, these NiMh batteries are apt for the personal use as they comprise hydrogen absorbing alloys in place of electrodes.
Posted: 16-09-2011 @ 17:09:35
it is a battery which is Low self discharge battery......these batteries are pre charged that we can use directly with out charging
Posted: 16-09-2011 @ 16:10:21
NiMH battery means Nickel–metal hydride battery. this are low self discharge batteries. this gives more stand by. Their unique NiZn (Nickel-Zinc) batteries offer better voltage output when compared to NiMH at about 1.6 volts (NiMH average around 1.2V)
Posted: 16-09-2011 @ 15:30:54
nickel-metal hydride battery is one of rechargeble battery
Posted: 16-09-2011 @ 11:53:02