T E A M
are they really what they claim??..2000mAh ..are they really 2000mAh??..as what they claim???..
recently i just got this charger from the states
The La Crosse BC-900
Specs of charger
Charges Battery Types: AA & AAA NiCd and NiMH
Input Voltage for AC/DC Adapter: 100-240 VAC
Charging Current Range: 200 mA - 1800 mA
Max Charging Capacity : 3000mAh
Dimensions: 3.0" x 5.1" x 1.5"
from en.wikipedia.org
From the BC-900 Manual..there is a Test Mode to determine the capacity of the batt
so when i use this Test Mode on a XX Brand 2000 mAh Batt...what i got was shocking....all 12 batteries cycled using the Test Mode shows capacity less than 1660 mAh...some of them even showed less than 1600mAh....i will be doing more Test Mode cycle on other brands ( Sanyo etc )
Charging Current in Test Mode : 1000 mA
Discharging current : 500 mA
i am ok ..if the capacity after Test Mode shows +/- 10% of 2000mAh...but < 1660 mAh...thats insane.....lets see what the reponse from that company will be...i just called them up and told them about what i found out...
recently i just got this charger from the states
The La Crosse BC-900
Specs of charger
Charges Battery Types: AA & AAA NiCd and NiMH
Input Voltage for AC/DC Adapter: 100-240 VAC
Charging Current Range: 200 mA - 1800 mA
Max Charging Capacity : 3000mAh
Dimensions: 3.0" x 5.1" x 1.5"
from en.wikipedia.org
Battery capacity
The capacity of a battery to store charge is often expressed in ampere hours (1 A·h = 3600 coulombs). If a battery can provide one ampere (1 A) of current (flow) for one hour, it has a real-world capacity of 1 A·h. If it can provide 1 A for 100 hours, its capacity is 100 A·h. Likewise, 20 A for 2 hours equals 40 A·h capacity. But...
While a battery that can deliver 10 A for 10 hours can be said to have a capacity of 100 A·h, that is not how the rating is determined by the manufacturers. A 100 A·h rated battery most likely will not deliver 10 A for 10 hours. Battery manufacturers use a standard method to determine how to rate their batteries. Their rating is based on tests performed over 20 hours with a discharge rate of 1/20 (5%) of the expected capacity of the battery an hour. So a 100 ampere-hour battery is rated to provide 5 A for 20 hours. The efficiency of a battery is different at different discharge rates. When discharging at 5% an hour, the battery's energy is delivered more efficiently than at higher discharge rates.
To calculate the 5% discharge rate of a battery, take the manufacturer's ampere-hour rating and divide it by 20. For example, you have a AA cell rated at 1300 mA h (milliampere hours). The 5% discharge rate from which this rating was derived would be 1300 mA·h / 20 h = 65 mA.
The capacity of a battery to store charge is often expressed in ampere hours (1 A·h = 3600 coulombs). If a battery can provide one ampere (1 A) of current (flow) for one hour, it has a real-world capacity of 1 A·h. If it can provide 1 A for 100 hours, its capacity is 100 A·h. Likewise, 20 A for 2 hours equals 40 A·h capacity. But...
While a battery that can deliver 10 A for 10 hours can be said to have a capacity of 100 A·h, that is not how the rating is determined by the manufacturers. A 100 A·h rated battery most likely will not deliver 10 A for 10 hours. Battery manufacturers use a standard method to determine how to rate their batteries. Their rating is based on tests performed over 20 hours with a discharge rate of 1/20 (5%) of the expected capacity of the battery an hour. So a 100 ampere-hour battery is rated to provide 5 A for 20 hours. The efficiency of a battery is different at different discharge rates. When discharging at 5% an hour, the battery's energy is delivered more efficiently than at higher discharge rates.
To calculate the 5% discharge rate of a battery, take the manufacturer's ampere-hour rating and divide it by 20. For example, you have a AA cell rated at 1300 mA h (milliampere hours). The 5% discharge rate from which this rating was derived would be 1300 mA·h / 20 h = 65 mA.
so when i use this Test Mode on a XX Brand 2000 mAh Batt...what i got was shocking....all 12 batteries cycled using the Test Mode shows capacity less than 1660 mAh...some of them even showed less than 1600mAh....i will be doing more Test Mode cycle on other brands ( Sanyo etc )
Charging Current in Test Mode : 1000 mA
Discharging current : 500 mA
i am ok ..if the capacity after Test Mode shows +/- 10% of 2000mAh...but < 1660 mAh...thats insane.....lets see what the reponse from that company will be...i just called them up and told them about what i found out...
Comment