tutorials:learn:lipoly:index.html
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tutorials:learn:lipoly:index.html [2011/05/18 17:59] ladyada |
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| *LiCo (lithium cobalt, the anode chemistry) | *LiCo (lithium cobalt, the anode chemistry) | ||
| - | Lithium Ion cells tend to be thin rectangles in a silvery bag. They are soft-shelled and have an easy to damage casing. They often weigh a little less and come in smaller capacity. You can fit them into smaller devices such as tiny iPods. These are often called: | + | Lithium Ion Polymer cells tend to be thin rectangles in a silvery bag. They are soft-shelled and have an easy to damage casing. They often weigh a little less and come in smaller capacity. You can fit them into smaller devices such as tiny iPods. These are often called: |
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| - | Depending on the design and chemistry of your lithium cell, you may see them sold under different nominal "voltages". For example, almost all lithium polymer batteries are **3.7V** or **4.2V **batteries. What this means is that the **maximum** voltage of the cell is **4.2v** and that the "nominal" (average" voltage is **3.7V**. As the battery is used, the voltage will drop lower and lower until the minimum which is around 3.0V. You should see the number **3.7V** written on the battery itself somewhere. | + | Depending on the design and chemistry of your lithium cell, you may see them sold under different nominal "voltages". For example, almost all lithium polymer batteries are **3.7V** or **4.2V **batteries. What this means is that the **maximum** voltage of the cell is **4.2v** and that the "nominal" (average) voltage is **3.7V**. As the battery is used, the voltage will drop lower and lower until the minimum which is around 3.0V. You should see the number **3.7V** written on the battery itself somewhere. |
| {{ http://www.ladyada.net/images/lipoly/37v.jpg?nolink&455x439 |}} | {{ http://www.ladyada.net/images/lipoly/37v.jpg?nolink&455x439 |}} | ||
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| ***3.7/4.2V** battery and** 3.7/4.2V** charger: OK | ***3.7/4.2V** battery and** 3.7/4.2V** charger: OK | ||
| ***3.7/4.2V** battery and **3.6/4.1V** charger: OK (but not ideal) | ***3.7/4.2V** battery and **3.6/4.1V** charger: OK (but not ideal) | ||
| - | ***3.6/4.1V** battery and **3.6/4.1V** battery: OK | + | ***3.6/4.1V** battery and **3.6/4.1V** charger: OK |
| ***3.6/4.1V ** battery and **3.7/4.2V** charger **NOT OK!** | ***3.6/4.1V ** battery and **3.7/4.2V** charger **NOT OK!** | ||
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| The **PWR** red LED on either board will light up to let you know its powered properly. While charging, an LED will also be lit. For the USB only charger, a green done LED will light when the battery is full. For the USB/DC charger, the charging LED will blink slowly (once every few seconds) | The **PWR** red LED on either board will light up to let you know its powered properly. While charging, an LED will also be lit. For the USB only charger, a green done LED will light when the battery is full. For the USB/DC charger, the charging LED will blink slowly (once every few seconds) | ||
| - | You can change the charge rate of each charger by soldering an LED into slot **R4 **(for the USB charger) or **RPROG** (the USB/DC charger). | + | You can change the charge rate of each charger by soldering a resistor into slot **R4 **(for the USB charger) or **RPROG** (the USB/DC charger). |
| **The max charge rate of the USB charger is about 1000 mA**. To acheive this charge rate, you can either solder a **1.3K** resistor on top of **R4** (default 4.7K) - this will make the total parallel restance 1.0K or you can remove** R4** by desoldering it or cutting the trace to it and solder a 1.0K resistor in its place | **The max charge rate of the USB charger is about 1000 mA**. To acheive this charge rate, you can either solder a **1.3K** resistor on top of **R4** (default 4.7K) - this will make the total parallel restance 1.0K or you can remove** R4** by desoldering it or cutting the trace to it and solder a 1.0K resistor in its place | ||
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