Advantages and disadvantages of lithium-ion batteries
Advantages: no memory effect, lighter weight.
Disadvantages: high cost, low current, intolerance to over-saturation (compared with NiMH).
Lithium-ion batteries have primary lithium batteries (non-rechargeable) and secondary lithium batteries (rechargeable), and 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), which are lighter than Ni-MH batteries and have a volumetric energy density ratio of 48% higher. Because of this, the processing and sales of lithium-ion secondary batteries are gradually surpassing nickel-hydrogen batteries. This kind of battery has low self-discharge and no memory effect. The charge and discharge times can reach more than 600 times. Especially the Li-Polymer battery developed in recent years. In addition to its smaller size, it is not affected by the cylindrical or square battery. The appearance is limited, and the weight is lighter.
Lithium-ion batteries are not resistant to overcharging, and there is a danger of explosion if they are used carelessly. Therefore, a built-in control IC is required to guard against overcharging, but the cost is relatively higher. Since the specifications of lithium-ion batteries are not uniform, there will be cases where the batteries cannot be purchased after the production is discontinued. However, it has improved a lot.
Advantages and disadvantages of nickel-metal hydride batteries
Advantages: low price, strong versatility, large current, stable environmental protection.
Disadvantages: heavy weight and short battery life.
The design of nickel-metal hydride batteries originated from nickel-cadmium batteries, but there has been great progress in improving the memory effect of nickel-cadmium batteries. The important change is the replacement of cadmium originally used in the negative electrode with a hydrogen storage alloy, so the nickel-hydrogen battery can be said to be a typical representative of material innovation. The pollution caused by nickel-metal hydride batteries is much smaller than that of nickel-cadmium batteries containing cadmium. Therefore, nickel-cadmium batteries have been gradually replaced by nickel-metal hydride batteries.
Except for a few lithium-ion batteries that can be used once (NIKONEN-EL1 and 2CR5), most of the lithium-ion batteries do not have a battery replacement method. This is about going abroad for a long time or a large number of users is very troublesome. Ni-MH batteries have no such problem. , Digital cameras that use Ni-MH batteries can usually be replaced by alkaline batteries.
In recent years, digital cameras have increasingly used nickel-metal hydride batteries. Battery manufacturers are also optimistic about this market. They have introduced high-capacity nickel-metal hydride rechargeable batteries. Ion batteries are on par, and even the chargers are getting better and better, and the charging time is greatly shortened.
The difference between Li-ion battery and Ni-MH battery charging method
Many consumers often use the same concept in the battery use process. Lithium-ion batteries are now the mainstream, but the past nickel-metal hydride batteries are still used on lithium-ion batteries. In fact, lithium-ion batteries In addition to the product difference between the battery and the Ni-MH battery, the method of use is also different.
Newly purchased lithium-ion battery: Use it for the first three times until it is turned off naturally, and then use the original direct charge to charge the phone to full, and then keep charging for about 1 hour (about 2 hours above 2000mah).
Daily: It's ok to overflow, and the follow-up charge will not exceed 1 hour. Prevent late night charging (high grid voltage). The battery can be used as it is charged, and can be used to alarm or shut down. Note that the battery that is shut down should be charged as soon as possible, otherwise the self-discharge of the battery and the continuous drop in voltage may cause the self-locking protection to fail to charge. Make it a habit: when you arrive at your work unit during the day and at home at night, start charging, and unplug the power after overflowing, or before you leave or go to bed.
Use: General lithium-ion batteries can be charged, used, and stopped at any time. Cycle life refers to the number of full charge and full discharge. Partial charge and discharge can be understood as a fraction of the life. The key to battery usage: the battery is overflowing, and it can be charged for 20 minutes to half an hour to reach saturation, but it must be prevented from being charged for a long time after overflowing. Long-term continuous charging after full charge will cause side effects, resulting in a decrease in capacity and an increase in internal resistance, resulting in reduced capacity and shutdown as soon as a call is made. It is best to use PPC and other machines with power chips to recharge until the power is dead. It is important to consider the issue of power display and measurement.
Continuous charging after the battery overflows is very harmful to the lithium-ion battery. When the battery is fully charged, side reactions will occur inside the battery. The active material will decrease, the garbage will increase, the capacity will decrease, and the internal resistance will increase. Serious overcharge will directly damage the battery structure and cause the battery to be scrapped. At present, some chargers also provide a charging protection mode, which will adjust the charging mode according to whether the battery power is overflowing, which can effectively protect the battery.
Lithium-ion batteries can be charged at any time, which has a limited impact on life. For batteries with fuel gauges such as PPCs, it is recommended to charge them after automatic shutdown to avoid impact. It can be charged at any time and can be stopped at any time. If it is filled with continuous charging, it will have an impact on the life of the battery.