The difference between lithium batteries and nickel-metal hydride batteries is that lithium batteries are more suitable for use on mobile phones, but on digital cameras, the demand for current is quite large, and the power consumption is much larger than that of mobile phones. Better.
Advantages and disadvantages of lithium batteries
Advantages: no memory effect, lighter weight.
Disadvantages: high cost, low current, not resistant to oversaturation (compared with nickel hydrogen).
Lithium batteries include primary lithium batteries (non-rechargeable) and secondary lithium batteries (rechargeable). Secondary lithium batteries are divided into Li-ion lithium-ion batteries and Li-Polymer lithium polymer batteries.
Generally, digital cameras use secondary lithium batteries (rechargeable). Compared with nickel-metal hydride batteries, they are lighter in weight and have a volumetric energy density ratio that is 48% higher. Because of this, the production and sales of lithium-ion secondary batteries are gradually surpassing nickel-metal hydride batteries. This type of battery has a small self-discharge and no memory effect. It can be charged and discharged more than 600 times, especially the Li-Polymer lithium polymer battery, which has been developed in recent years. Restricted appearance and lighter weight.
Lithium batteries are not resistant to over-saturation. If they are used accidentally, there is a danger of explosion. Therefore, a built-in control IC is required to prevent over-saturation, but the cost is relatively high. Because the specifications of lithium batteries are not uniform, there will be cases where batteries cannot be purchased after production is discontinued. But it has improved a lot.
Advantages and disadvantages of Ni-MH batteries
Advantages: low price, strong versatility, large current, environmental protection and stability.
Disadvantages: heavy weight and short battery life.
The design of nickel-hydrogen batteries is derived from nickel-cadmium batteries, but great progress has been made in improving the memory effect of nickel-cadmium batteries. The main change is to replace the original cadmium used in the negative electrode with a hydrogen storage alloy, so the nickel-metal hydride battery can be said to be a typical representative of material innovation. The pollution caused by nickel-metal hydride batteries will be much less than that of nickel-cadmium batteries containing cadmium. Therefore, nickel-cadmium batteries have gradually been replaced by nickel-hydrogen batteries.
Except for a few lithium batteries that can be used once (NIKONEN-EL1 and 2CR5), most of them do not have a battery replacement solution. This is very troublesome for a long time to go abroad, or a large number of users. NiMH batteries have no such problem Digital cameras using nickel-metal hydride batteries can often be replaced with alkaline batteries.
In recent years, digital cameras have increasingly used nickel-metal hydride batteries, and battery manufacturers are also optimistic about this market. They have introduced high-capacity nickel-metal hydride rechargeable batteries, which has made the technology of nickel-metal hydride batteries leaps and bounds. The battery is comparable, and even the charger is getting more and more sophisticated, and the charging time is greatly reduced.