our li-ion battery is rechargeable for more than 1200 times!

   Home  |  Company  |  Trade terms  |  Feedback  |  Site map  |  Contact us   

English (EN)  |  Español (ES)  |  Français (FR)  |  Portuguese (PT)    

New Wisdom li-ion battery New Wisdom LED cap lamp
NEW WISDOM INVESTMENT LIMITED   
Mirror Sites:
www.caplamp.org
www1.caplamp.org

Home >>
Knowledge >>
A Glossary of Battery Terms
About lamp special vocabulary comparation list
Battery Energy Density
Battery FAQ
battery knowledge
Battery statistics
Battery Tips Contents
Charging lithium-ion batteries
Discharge methods
Discharging temperature
Future battery
history mineral lamp
How charge
Industrial Standard Cylindrical Battery Sizes
lithium-ion the ideal battery
Rechargeable able Battery
the best battery
When was the battery invented
links

mineral lamp >>
LED miner's lamp NEW
KL8M mineral lamp
KL8M The old lamp (left) compare with our li-ion battery lamp (right)
Charger >>
GWB-15 Portable Charger
KCLA series charger rack
KCLA-12A module compact style charger rack
ZLCD-34 charger module to reborn the old rack
LED miner's lamp also call:
LED cap lamp
LED safety lamp
LED mining lamp
KL5M LED mineral lamp

complete specification PDF format
NEW WISDOM Miner's lamp booklet(950k)
NEW WISDOM KL5M LED Miner's lamp booklet(380k)
NEW WISDOM KL8M Double filaments Miner's lamp booklet(450k)
NEW WISDOM GWB-15 Portable charger booklet(400k)
NEW WISDOM KCLA series charger rack booklet(350k)
NEW WISDOM ZLCD series charge module booklet(450k)

li-ion battery >>
li-ion battery
battery
site map

Frequently Asked Questions:
Answers of frequently asked questions to miner's lamp

Sample policy:
Samples fee is usd98 for one piece, it is prepaid in advance for lamp sample. Please offer your express account for us to send you the samples. such as DHL, FEDEX, UPS, and TNT etc. So that you're able to receive the samples ASAP.

Remittance Route
What's the best battery? 

Battery novices often brag about miracle batteries that offer very high energy densities, deliver 1000 charge/discharge cycles and are paper-thin. These attributes are indeed achievable but not on one and the same battery pack.

A certain battery may be designed for small size and long runtime, but this pack has a limited cycle life. Another battery may be built for durability but is big and bulky. A third pack may have high energy density and long durability but this version is too expensive for the consumer.

Battery manufacturers are aware of customer needs and offer packs that best suit the application. The mobile phone industry is an example of this clever adaptation. Here, small size and high energy density reign in favor of longevity. Short service life is not an issue because a device is often replaced before the battery is worn out.

Let's examine various battery designs, starting with nickel-metal-hydride. The cylindrical nickel-metal-hydride for commercial use offers a mid-range energy density of about 80Wh/kg and delivers roughly 400 cycles. The prismatic nickel-metal-hydride, a battery that is made for slim geometry, compromises on energy density and cycle count. This battery is rated at a moderate 60Wh/kg and offers around 300 cycles. Highly durable nickel-metal-hydride for industrial use are packaged in cylindrical cells, provide a modest 70Wh/kg but last for about 1000 cycles.

Similarly, lithium-ion batteries can be produced with various energy densities. Packing more energy into a cell compromises safety. While commercial lithium-ion batteries are safe, super-high capacity lithium-ion for defense applications are, for safety reasons, not approved for the public at large.

Below is a summary of the strength and limitations of today's popular battery systems. Although energy density is paramount, other important attributes are service life, load characteristics, maintenance requirements, self-discharge and operational costs. Since nickel-cadmium remains a standard against which batteries are compared, we evaluate alternative chemistries against this classic battery type.

-Nickel-cadmium - mature but has moderate energy density. nickel-cadmium is used where long life, high discharge rate and extended temperature range is important. Main applications are two-way radios, biomedical equipment and power tools. nickel-cadmium contains toxic metals.

-Nickel-metal-hydride - has a higher energy density compared to nickel-cadmium at the expense of reduced cycle life. There are no toxic metals. Applications include mobile phones and laptop computers.

-Lead-acid - most economical for larger power applications where weight is of little concern. Lead-acid is the preferred choice for hospital equipment, wheelchairs, emergency lighting and UPS systems.

-Lithium-ion - fastest growing battery system; offers high-energy density and low weight. Protection circuit are needed to limit voltage and current for safety reasons. Applications include notebook computers and cell phones.

-Lithium-ion-polymer - Similar to lithium-ion, this system enables slim geometry and simple packaging at the expense of higher cost per watt/hours. Main applications are cell phones.

-Reusable Alkaline - Its limited cycle life and low load current is compensated by long shelf life, making this battery ideal for portable entertainment devices and flashlights.
Table 1 summarizes the characteristics of the common batteries. The figures are based on average ratings at time of publication. Note that nickel-cadmium has the shortest charge time, delivers the highest load current and offers the lowest overall cost-per-cycle but needs regular maintenance.

  Nickel-cadmium Nickel-metal-hydride Lead-acid Lithium-ion Lithium-ion-polymer Reusable Alkaline
Gravimetric Energy Density (wh/kg) 45-80 60-120 30-50 110-160 100-130 80 (initial)
Internal Resistance (includes peripheral circuits) in mΩ 100 to 200*1
6V pack
200 to 300*1
6V pack
<100*1
12V pack
150 to 250*1
7.2V pack
200 to 300*1
7.2V pack
200 to 2000*1
6V pack
Cycle Life
(to 80% of initial capacity)
1500*2 300 to 500*2, 3 200 to 300*2 300 to 500*3 300 to 500 50*3
(to 50% capacity)
Fast Charge Time 1h typical 2 to 4h 8 to 16h 2 to 4h 2 to 4h 2 to 3h
Overcharge Tolerance moderate low high very low low moderate
Self-discharge /Month
(room temperature)
20%*4 30%*4 5% 10%*5 -10%*5 0.3%
Cell Voltage (nominal) 1.25V*5 1.25V*5 2V 3.6V 3.6V 1.5V
Load Current
peak best result
20C
1C
5C
0.5C or lower
5C*7
0.2C
>2C
1C or lower
>2C
1C or lower
0.5C
0.2C or lower
Operating temperature*8
(discharge only)
-40 to 60℃ -20 to 60℃ -20 to 60℃ -20 to 60℃ 0 to 60℃ 0 to 65℃
Maintenance Requirement 30 to 60 days 60 to 90 days 3 to 6 months*9 not required not required not required
Typical Battery Cost*10
(US$, reference only)
$50
(7.2V)
$60
(7.2V)
$25
(6V)
$100
(7.2V)
$100
(7.2V)
$5
(9V)
Cost per Cycle (US$)*11 $0.04 $0.12 $0.10 $0.14 $0.29 $0.10 to 0.50
Commercial use since 1950 1990 1970 1991 1999 1992
             

Table 1: Characteristics of commonly used rechargeable batteries.

*1) Internal resistance of a battery pack varies with cell rating, type of protection circuit and number of cells. Protection circuit of lithium-ion and lithium-ion-polymer adds about 100mW.
*2) Cycle life is based on battery receiving regular maintenance. Failing to apply periodic full discharge cycles may reduce the cycle life by a factor of three.
*3) Cycle life is based on the depth of discharge. Shallow discharges provide more cycles than deep discharges.
*4) The discharge is highest immediately after charge, and then tapers off. The capacity of nickel-cadmium decreases 10% in the first 24h, then declines to about 10% every 30 days thereafter. Self-discharge increases with higher temperature.
*5) Internal protection circuits typically consume 3% of the stored energy per month.
*6) 1.25V is the open cell voltage. 1.2V is the commonly used as a method of rating.
*7) Capable of high current pulses.
*8) Applies to discharge only; charge temperature range is more confined.
*9) Maintenance may be in the form of 'equalizing' or 'topping' charge.
*10) Cost of battery for commercially available portable devices.
*11) Derived from the battery price divided by cycle life. Does not include the cost of electricity and chargers.

In subsequent columns I will describe the strength and limitation of each chemistry in more detail. We will examine charging techniques and explore methods to get the most of these batteries.

 

top


   Home  |  Company  |  Trade terms  |  Feedback  |  Site map  |  Contact us   


Address: 4-306, Xianglixincuen, Hongli West Road, Shenzhen, China
TEL:86-755-83911841 86-13316919837  86-13332985903   POSTCODE:518034   Contact person: Tom Ding;  Mary Deng
FAX:86-755-83906115 EMAIL: tom@li-ion-battery.com  tom@n-wisdom.com  dingbp_szb@21cn.net


Copyright © 2000-2007 NEW WISDOM INVESTMENT LIMITED. All rights reserved