Ni-MH battery is a kind of storage battery with good performance. Ni-MH batteries are divided into high-voltage Ni-MH batteries and low-voltage Ni-MH batteries. Everything has two sides, and Ni-MH batteries are no exception. Today, let’s take stock of the advantages and disadvantages of Ni-MH batteries.
Advantages of NiMH batteries
- High energy density.
The capacity is higher under the same volume. Taking the common AA battery as an example, the nominal capacity of the Ni-MH battery can reach 2900mAh (milliamp hours), while the nickel-cadmium battery is only 1100mAh (milliamp hours).
- The internal impedance is low, but not as low as nickel-cadmium batteries.
- Long cycle life
The cycle life is long, and it can be used more than 500 times under correct use conditions.
- No memory effect
Less obvious memory effect, and even many brands of Ni-MH batteries have claimed to have no memory effect.
- Strong and durable
NiMH cells can withstand overcharge and overdischarge conditions, simplifying battery management requirements.
- Flat discharge characteristics (but drop rapidly at the end of the cycle)
The old Ni-MH battery has a high self-discharge rate, and the self-discharge rate is 30-35% when it is fully charged and stored at room temperature, but the new Ni-MH battery has a relatively low self-discharge rate.see more:How long do golf cart batteries last
- Wide working temperature range
Generally speaking, normal temperature operation will not affect the charge and discharge performance of Ni-MH batteries.
- Large output current
Ni-MH batteries have a larger output current than carbon-zinc batteries or alkaline batteries, and are relatively more suitable for high-power consumption products. Some special models of power types even have larger output currents than ordinary Ni-Cd batteries.
- Repairable
The difference between NiMH battery and many batteries is that it is a repairable battery.
- Environmental protection
Nickel-metal hydride battery (NIMH) is improved from nickel-cadmium battery (NiCdbattery). It replaces cadmium (Cd) with a metal (rare earth alloy or tini alloy) that can absorb hydrogen. It can be recycled and reused, and it is an environmentally friendly battery.
Disadvantages of NiMH batteries
- The battery will age when stored for a long time
- High rate discharge is not as good as nickel-cadmium batteries.
- It is less tolerant of overcharging than nickel-cadmium batteries.
- Heavy weight.
- The battery life is short.