What is the best battery?

Battery newcomers boast of miracle batteries that ran very high energy density, process 1000 charge / discharge cycles and are paper thin. Such properties are certainly achievable, but not in one and the same Dell Vostro 1520 battery.

A certain battery may be built for small size and big performance, but this battery is a very limited life expectancy. Another battery may be built for long life expectancy, but it is thick and bulky. A third battery can have a high energy density and long life expectancy, but it is prohibitively expensive for the consumer.

Battery manufacturers know the customers needs and offer batteries that meet these requirements best. The mobile phone industry is an example of this clever adaptation to the market. Here have small dimensions and high energy density advantage over the long life expectancy. Short life expectancy is not a problem because the devices be replaced before the DELL Inspiron 1300 battery is worn out.

Let's look at different types of batteries, starting with nickel-metal hydride. The cylindrical nickel-metal hydride batteries have an average energy density of 80Wh/kg and allow an estimated 400 cycles. The prismatic nickel-metal hydride Dell Inspiron Mini 9 battery is designed for slim geometry, and agreed energy density and number of cycles. The battery is estimated to be moderate 60Wh/kg and offers approximately 300 cycles. Especially durable nickel-metal hydride batteries for industrial purposes are built as a cylindrical cells and result in modest 70Wh/kg, but are designed for approximately 1000 cycles.

Lithium-ion batteries can be built for different energy densities in a similar way. More energy packed into a cell at the expense of safety. While commercial lithium-ion DELL Latitude D620 battery have good security, super-high-capacity lithium-ion batteries for safety to the general public are not made available.
The following is a summary of the strengths and limitations of today's popular batteries. Although the energy density has the priority, there are also some other important points, such as life expectancy, load characteristics, maintenance expenses, self-discharge and operational costs. Since nickel-cadmium Dell Inspiron 1545 battery are still considered the standard for comparisons, we will evaluate different chemistries against this classic battery type.

Nickel-cadmium --- mature, but has only moderate energy density. Nickel-cadmium is used where emphasis is placed on a long life expectancy, large and wide temperature range.applications include radios, medical equipment and tools. Nickel-cadmium containing toxic metals.

Nickel-metal hydride provides --- a greater energy density than nickel-cadmium, but has a shorter life expectancy. Contains no toxic metals Suns dance. Applications include wireless phones and laptop computers.

Lead-acid --- cheapest solution for larger installations, where the weight does not matter. Lead-acid is mainly used in hospitals, wheelchairs, emergency lighting systems and unbreakable power supplies.

Lithium-ion batteries --- the largest growth potential. Provide high energy density with low weight. Protection circuits are needed to limit voltage and current for safety reasons. Applications include notebook computer and cellular phones.

Lithium-polymer lithium-ion --- As allowed this system to build lean Dell Inspiron 1520 battery in a simple design, but at higher cost for watt-hours. The main applications are cellular phones.

-Reusable Alkaline Batteries --- your limited number of charge cycles and the low charging current can be compensated by a long shelf life, making the Dell Inspiron 1525 battery for portable entertainment devices and flash devices ideal.
Table 1 summarizes the properties of ordinary batteries. It is based on average values of existing publications today. Note that nickel-cadmium has the shortest charge time, can make the most power and has the lowest operating costs, but requires regular maintenance.

Table 1: Characteristics of commonly used rechargeable batteries.

1) The internal resistance of a battery varies with the nature of cells, the nature of the protection circuit and the number of cells. Protection circuits for lithium ion and lithium-polymer increase the value by approximately 100mW.
2) The number of cycles to reach is based on a regular maintenance. In the absence of a periodically performed the full charge can be reduced the number of cycles to reach the factor of 3.
3) The number of cycles to reach based on the DoD. Weak discharge is more than deep discharge cycles.
4) The most powerful self-discharge takes place immediately after loading, and decreases afterwards. The capacity of a nickel-cadmium decreases during the first 24 to 10%, it then takes off every 30 days by a further 10%. The self-discharge is higher at higher temperatures.
5) The internal protection circuitry typically required per month 3% of the stored energy.
6) 1.25V is the open cell voltage. 1.2V is typically used as a method for setting.
7) Suitable for high current pulses.
8) Only used for discharge, charging temperature range is more limited.
9) Maintenance may be in the form of 'balanced' or 'maximum' charge.
10) battery costs for portable devices available on the market.
Derived from the battery 110 divided by number of price cycles. Does not include electricity costs and the costs of the Chargers.