The current charging and discharging of a Apple A1175 battery is measured in C-rate. Most portable batteries are rated at 1C. This means that a 1000mAh battery would provide 1000mA for one hour if discharged at 1C rate. The same Dell 1521 battery discharged at 0.5C would provide 500mA for two hours. At 2C, the 1000mAh battery would issue 2000mA for 30 minutes. 1C is often defined as a discharge of an hour, a 0.5C would be a two-hour, and a 0.1C a 10-hour download.
The capacity of a battery is commonly measured with a Dell Latitude X300 battery analyzer. If the reading ability of the analyzer is shown as a percentage of par value, 100% is available if a 1000 mAh battery can provide this current for one hour. If the battery lasts only 30 minutes before cut-off, 50% is indicated. A new battery sometimes provides more than 100% of capacity.
When you download a battery with a battery analyzer that allows you to set different discharge C-rates, higher capacity reading is observed if the battery is low a C-rate, and vice versa. By discharging the battery at 1000mAh 2C, or 2000mA, the analyzer is scaled to derive the maximum capacity in 30 minutes. In theory, the ability to read should be the same with a slower discharge, since the same amount of energy is supplied only for a shorter time. Due to internal energy losses and a voltage drop that causes the battery to get low-end voltage cut-off sooner, reading ability can be lowered to 95%. Download the battery at 0.5C, or 500mA over two hours may increase the reading skills of approximately 105%. The discrepancy in capacity readings with different C-rates is related to the internal Latitude D600 SERIES battery resistance.
A battery that does not perform well at a 1C discharge rate is the portable sealed lead acid. To get a fairly good reading skills, manufacturers commonly rate these batteries at 0.05C discharge or 20 hours. Even at this slow rate of discharge capacity of 100% is difficult to achieve. To compensate for different readings at various discharge currents, manufacturers offer a capacity of offset. Applying the offset to correct the reading ability does not improve Inspiron E1405 battery performance, but adjusts the capacity calculation if discharged at a higher or lower rate of C than that specified.
Lithium-ion/polymer batteries are electronically protected against high load currents. Depending on the type of Pavilion dv8000 Battery unloading is limited to between 1C and 2C. This protection makes the lithium ion unsuitable for biomedical equipment and power tools require high starting currents.
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