Laptop Batteries: Difference between revisions
(New page: ==Types of Batteries== OLPC is using two battery chemistry's from 2 vendors: [http://en.wikipedia.org/wiki/Nickel_metal_hydride_battery NiMH], and [http://en.wikipedia.org/wiki/Lithium_i...) |
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=== GoldPeak NiMH === |
=== GoldPeak NiMH === |
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=== GoldPeak LiFePo4 === |
=== GoldPeak LiFePo4 === |
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Typical capacity： 2900 mAh <br> |
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Minimum capacity: 2800 mAh <br> |
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Operating Voltage Rage: 7.3V to 4V at 0.2C discharge current <br> |
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Operating Temp Charge: 0 ~ +60°C <br> |
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Operating Temp Discharge: -20 ~ +70°C <br> |
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Standard charge rate: CC-CV .8C up to 7.3V <br> |
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Max charge rate：1.5C（4200 mA） <br> |
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=== BYD LiFePo4 === |
=== BYD LiFePo4 === |
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Revision as of 15:25, 22 August 2007
Types of Batteries
OLPC is using two battery chemistry's from 2 vendors: NiMH, and LiFePo4 batteries. The LiFePo4 batteries allow charging at higher temperatures. The NiMH batteries cannot be charged above about 45 degrees C.
Our batteries vendors are Goldpeak and BYD.
GoldPeak provides both NiMH and LiFePo4 packs.
BYD provides only LiFePo4 packs.
Each chemistry and manufacturer have slightly different specifications.
GoldPeak NiMH
GoldPeak LiFePo4
Typical capacity： 2900 mAh
Minimum capacity: 2800 mAh
Operating Voltage Rage: 7.3V to 4V at 0.2C discharge current
Operating Temp Charge: 0 ~ +60°C
Operating Temp Discharge: -20 ~ +70°C
Standard charge rate: CC-CV .8C up to 7.3V
Max charge rate：1.5C（4200 mA）
BYD LiFePo4
Typical capacity： 3150 mAh
Minimum capacity: 3100 mAh
Operating Voltage Rage: 7.5V to 5V at 0.2C discharge current
Operating Temp Charge: -10 ~ +50°C
Operating Temp Discharge: -20 ~ +55°C
Max charge rate：1C（3150 mA）
Lifetime requirements for all batteries
Ambient Temperature：25°C
Number of Cycles：2000
Remaining Capacity after 2000 cycles：50%