Recently i have been facing problems with my battery backup of my cellphone, so i have decided to replace it with a new one. I have been to local mobile store, to my surprise, i have various options to choose from.
Different Types of Mobile phone batteries:
There are 3 types of batteries used at the moment in World wide market –
- NiCd batteries :
These are no longer used in cell phones by their producers. Due big sizes and low power input. They stay alive up to 1000 cycle of charge/discharge.
- Ni-Mh batteries :
This is most popular type of battery used at the moment. They are more effective than NiCd battery but very sensitive for temperature.
- Li-ion batteries :
They are at the moment best choice. They got great capacity of power with very small sizes and weight. You can charge them without waiting for discharging.
Lithium Ion battery is the best option available in all present cases. Whether you are using it inside a cell phone, PDA , laptop , digital camera .. etc
In many respects, Li-ion provides a superior service to other chemical processes, but its performance is limited to a defined lifespan. The Li-ion battery has a time clock that starts ticking as soon as the battery leaves the factory. The electrolyte slowly ‘eats up’ the positive plate and the electrolyte decays. This chemical change causes the internal resistance to increase. In time, the cell resistance raises to a point where the battery can no longer deliver the energy, although it may still be retained in the battery. Equipment requiring high current bursts is affected most by the increase of internal resistance.
Battery wear-down on lithium-based batteries is caused by two activities: actual usage or cycling, and aging. The wear-down effects by usage and aging apply to all batteries but this is more pronounced on lithium-based systems.
The Li-ion batteries prefer a shallow discharge. Partial discharges produce less wear than a full discharge and the capacity loss per cycle is reduced. A periodic full discharge is not required because the lithium-based battery has no memory. A full cycle constitutes a discharge to 3V/cell. When specifying the number of cycles a lithium-based battery can endure, manufacturers commonly use an 80 percent depth of discharge. This method resembles a reasonably accurate field simulation. It also achieves a higher cycle count than doing full discharges.
In addition to cycling, the battery ages even if not used. The amount of permanent capacity loss the battery suffers during storage is governed by the SoC and temperature. For best results, keep the battery cool. In addition, store the battery at a 40 percent charge level. Never fully charge or discharge the battery before storage. The 40 percent charge assures a stable condition even if self-discharge robs some of the battery’s energy. Most battery manufacturers store Li-ion batteries at 15°C (59°F) and at 40 percent charge.
Guidelines for Lithium ion Batteries:
* Charge the Li-ion often, except before a long storage. Avoid repeated deep discharges.
* Keep the Li-ion battery cool. Prevent storage in a hot car. Never freeze a battery.
* If your laptop is capable of running without a battery and fixed power is used most of the time, remove the battery and store it in a cool place.
* Avoid purchasing spare Li-ion batteries for later use. Observe manufacturing date when purchasing. Do not buy old stock, even if sold at clearance prices.