Research has brought about a variety of battery chemistries, each offering distinct advantages but none providing a fully satisfactory solution. With today’s variety of battery types, better choices can be made to suit specific user applications. This paper talks about the recommended battery chemistry for cell phones and two-way radios in terms of energy density, durability and price.

What’s the best battery for cell phones?

Early cell phones were powered with nickel-based batteries but most newer phones are now equipped with lithium-ion. This chemistry is lightweight, offers high energy density and lasts long enough to span the typical life of the product. Lithium-ion contains no toxic metals.
To obtain thin geometry, some cell phone manufacturers switched to lithium-ion-polymer.

This satisfied consumer requests for slim designs. In the meantime, technological advancements also made low profile lithium-ion possible. lithium-ion packs are now available in 3 mm, a profile that suits most designs. lithium-ion has the advantage of lower manufacturing cost, better performance and longer cycle life than the polymer version.

Lithium-ion is a low maintenance battery(dell inspiron 1520 battery apple a1185). No periodic discharge is needed and charging can be done at random. A random charge means that the battery does not need to be fully depleted before recharge. In fact, it is better to recharge before the battery gets too low. Full discharges put an unnecessary strain on the battery. A recharge on a partially charged battery does not cause memory because there is none.

Charging lithium-ion is simpler and cleaner than nickel-based batteries but the chargers require tighter tolerances. lithium-ion cannot absorb overcharge and no trickle charge is applied on full charge. This allows lithium-ion to be kept in the chargers until used. Some chargers apply a topping charge every week or so to replenish the capacity lost through self-discharge while the battery(sony vgp-bpl8 battery) sits idle in the charger. Repeated insertion into the charger or cradle does not damage the battery though overcharge. If the battery is full, no charge is applied. The battery voltage determines the need to charge.

On the negative side, lithium?ion gradually loses charge acceptance as part of aging, even if not used. lithium?ion batteries should not be stored for long periods but be rotated like perishable food. The buyer should be aware of the manufacturing date when purchasing a replacement battery. Aging affects battery chemistries at different degrees.

Counterfeit cell phone batteries (clone batteries)

In the search for low-cost battery replacements, consumers may inadvertently purchase clone cell phone batteries that do not include an approved protection circuit. Lithium-ion packs require a protection circuit to shut off the power source if the charger malfunctions and keep on charging, or if the pack is put under undue stress (electrical short). Overheating and ‘venting with flame’ can be the result of such strain. (See photos of an exploded cell phone with clone battery on charge.)

Cell phone manufacturers strongly advise customers to replace the battery(sony vgp-bpl5a  dell inspiron 6400 battery) with an approved brand. Failing to do so may void the warranty. Counterfeit cell phone batteries have become visible since the beginning of 2003 when the world was being flooded with cheap replacement batteries from Asia.

Cell phone manufacturers act out of genuine concern for safety rather than using scare tactics to persuade customers to buy their own accessories. They do not object to third party suppliers in offering batteries and chargers as long as the products are well built, safe and functioning. The buyer can often not distinguish between an original and a counterfeit battery(vgp-bps9 sony vgp-bps9 battery) because the label may appear bona fide.

Caution should also be exercised in purchasing counterfeit chargers. Some units do not terminate the battery correctly and rely on the battery’s internal protection circuit to cut off the power when fully charged. Precise full-charge termination and a working protection circuit are needed for the safe use of the lithium-ion battery.

What’s the best battery for two-way radios?

Most two-way radios use nickel-cadmium. These batteries are durable and forgiving if abused. But nickel-cadmium batteries have only moderate energy density and are environmentally unfriendly. Environmental agencies have been discouraging its use, especially in Europe. The recommended alternative is nickel-metal-hydride, a battery(HP Pavilion DM3 battery) that has higher energy density and contains no toxic metals. nickel-metal-hydride has been tested in two-way radios for a number of years but the results are mixed. Shorter than expected service life is the major drawback.

For two-way radios, nickel-metal-hydride has a cycle life, which is half that of standard nickel-cadmium. nickel-metal-hydride prefers a moderate discharge current of 0.5C or less. A two-way radio, on the other hand, draws a discharge current of about 1.5A when transmitting at 4W of power. High discharge loads and sharp pulse currents shorten battery life.

To compare the longevity of nickel-metal-hydride under different load condition, a test was carried out in which batteries of the same type were discharged with a DC and digital load. In both tests, the batteries were discharged to 1.04 volts per cell. The DC load was a steady 500mA; the digital load simulated the Global System for Mobile Communications (GSM) at 1.65 ampere peak for 12 ms every 100 ms with 270 mA standby. (Note that the GSM pulse for voice is about 550 ms every 4.5 ms).

With the DC discharge, nickel-metal-hydride wore out gradually, providing an above average service life. At 700 cycles, the battery(hp elitebook 2530p battery) still provided 80% capacity. By contrast, the same battery type faded more rapidly with a digital discharge and the 80% capacity threshold was reached after only 300 cycles. This phenomenon indicates that the kinetic characteristics for nickel-metal-hydride deteriorate more rapidly with a digital than analog load. Although the test was simulating a GSM cell phone, Tetra and other digital two-way radios have similar loading.

Let’s briefly compare the characteristics of nickel-cadmium and nickel-metal-hydride. nickel-cadmium has the advantage of maintaining steady high capacity and low internal resistance through most of its service life. nickel-metal-hydride, on the other hand, starts with good capacity and low internal resistance but the resistance increases after a few hundred cycles, causing the voltage to drop on a load. Even though the energy may still be present, the battery(vgp-bps8) cannot deliver the high current during transmit and the message cuts off. The radio becomes unreliable.

Nickel-based batteries are high in maintenance. Periodic discharge cycles are needed to prevent crystalline formation on the cell plates, also known as memory. nickel-cadmium is more receptive to memory than nickel-metal-hydride because both nickel and cadmium plates are affected by memory.

Nickel-cadmium should be exercised once ever 1 to 2 months, whereas nickel-metal-hydride can get by with a deliberate full discharge once every 3 months. Without proper maintenance, the advantage of nickel-cadmium over nickel-metal-hydride in terms of cycle life cannot be realized.

Lithium-ion has been tested for two-way radios and the results are positive. Substituting lithium-ion with nickel-based will require chargers specifically suited for this chemistry. While nickel-cadmium and nickel-metal-hydride can often share the same charger, lithium-ion uses a different charge algorithm. There is also a cost premium for lithium-ion. Future two-way radios will undoubtedly be fitted with lithium-ion.

In an order on behalf of vehicle manufacturers of electric cars before the war kicked off, the laptop battery manufacturers already ready.

Last week, Japan’s largest industrial electronics group Hitachi has already announced plans to expand its hybrid vehicle lithium-ion vgp-bps9 vgp-bpl8 production capacity target is by 2015 to expand production capacity 70 times to cover the annual 700,000 hybrid electric vehicle demand (each hybrid cars are usually equipped with a 30 ~ 50 lithium-ion battery), costs 20 billion to 300 billion yen. In the autumn of this year before the initial production capacity Hitachi plans to widen to more than 600%.

At the same time, has always been considered in the new energy vehicles in the market lags behind Europe and the United States on the Japanese car maker, is also the field of battery technology can not have any slack.

Not long ago, America’s leading supplier of automotive batteries, one of Johnson Controls and energy storage solutions provider, Shuai-fu was a joint venture of Johnson Controls – Shuai Fu had announced plans to set up its first production in the United States for the hybrid vehicle lithium-ion battery processing plant. Plant will be based on the original transformed plant is expected to cost around 220 million U.S. dollars transformation, the initial production capacity will reach 15 million lithium-ion batteries.

The reason why the car battery technology, has invested heavily on the one hand is the new energy sources has become a global topic for all countries in promoting the industrialization of new energy vehicles process; the other hand, battery technology as the core area of hybrid and electric cars , “Who is the first breakthrough in  HP Pavilion DM3 battery vgp-bps8 technology, who may become a future automotive industry, the overlord.” Automotive Safety and Energy, State Key Laboratory Ouyang Ming Gao told CBN reporter.

It is reported that Hitachi has received General Motors to produce 100,000 hybrid cars lithium-ion batteries under the orders from General Motors plans to sell these cars next year.

Johnson Controls – Shuai Fu will also get BMW 7-Series (model picture forums) Active Hybrid cars (expected in 2010 listing), Azure Dynamic hybrid electric commercial vehicle of the Balance Project (listed in 2010) and Ford’s first Plug-in Hybrid Electric Vehicle (expected in 2012 listed) the supply of lithium sony vgn-fz battery sony fz battery  hybrid system.

Moreover, Hitachi will also be two kinds of large-scale production for the next generation of hybrids using new lithium-ion batteries.