Chip-cn-dat/TP/TP4056-dat/TP4056-dat.md
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+## Parameters
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+
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+
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+cacultation:
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+
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+ Ibat = charge current = Vprog / Rprog * 1200
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+
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+ where Vprog = 1V
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+
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+
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+| Rprog | Ibat | calculation |
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+| ----- | ------ | ------------- |
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+| 1.2K | 1A | 1.2/1.2 = 1 |
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+| 120 R | 10 A | 1.20.12 = 10 |
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+| 2.4K | 500 mA | 1.2/2.4 = 0.5 |
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+
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+
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+
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+
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## SCH
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![](2023-12-21-16-08-28.png)
Tech-dat/ohm-dat/ohm-dat.md
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+
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+# ohm-dat
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+
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+## Ohm's Law
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+
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+Ohm's Law describes the relationship between current, voltage, and resistance with the formula:
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+
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+\[ V = I \times R \]
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+
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+Where:
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+- \(V\) is the voltage (in volts, V)
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+- \(I\) is the current (in amperes, A)
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+- \(R\) is the resistance (in ohms, Ω)
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+
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+To find the required resistance \(R\), we can rearrange the formula:
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+
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+\[ R = \frac{V}{I} \]
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+
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+### Example Calculation
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+
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+Given the conditions:
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+- Voltage \(V = 3.3\) V
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+- Current \(I = 100\) mA = 0.1 A
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+
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+Substituting into the formula:
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+
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+\[
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+R = \frac{3.3}{0.1} = 33 \, \Omega
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+\]
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+
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+Thus, to achieve a current of 100 mA with a voltage of 3.3V, the required resistance is **33 ohms**.
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+
Tech-dat/power-dat/battery-dat/BMS-dat/2025-02-21-18-52-52.png
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Tech-dat/power-dat/battery-dat/BMS-dat/BMS-dat.md
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# BMS-dat
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+## A1870 + 3GJG (bad quality combination)
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+
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+A1870 - [[uc1870+ver1_x76b.pdf]]
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+
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+G3JQ - S8261 - [[S8261_E.pdf]]
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+
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+![](2025-02-21-18-52-52.png)
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+
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+## DW01 + FM8205
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+
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+
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+
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+
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+## ref
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+
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+
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+
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- [[BMS]] - [[battery]]
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\ No newline at end of file
Tech-dat/power-dat/battery-dat/BMS-dat/S8261_E.pdf
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Tech-dat/power-dat/battery-dat/BMS-dat/uc1870+ver1_x76b.pdf
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Tech-dat/power-dat/battery-dat/battery-dat.md
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- [[alkaline-battery-dat]] - [[lithium-ion-battery-dat]]
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+- [[lithium-battery-dat]]
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## coin battery dat
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@@ -17,17 +18,6 @@ Both button cells provide very low discharge rate that can work for 1-3 years.
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-## safest battery - Lithium Iron Phosphate (LiFePO4)
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-
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-The safest batteries to use, especially in terms of preventing fires or explosions, are Lithium Iron Phosphate (LiFePO4) batteries. They are known for their thermal and chemical stability compared to other lithium-ion batteries. Here are some key points about them:
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-
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-Safety: LiFePO4 batteries are less likely to overheat, catch fire, or explode because of their higher thermal runaway threshold. They also have better stability during overcharging and short-circuit conditions.
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-Longer lifespan: These batteries tend to last longer than other types, reducing the need for frequent replacements.
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-Stable chemistry: Their chemical structure is more resistant to thermal changes, which makes them safer even in extreme conditions.
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-
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-- LiFePO4 - https://www.youtube.com/watch?v=07BS6QY3wI8&ab_channel=HighTechLab
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-
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-
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32 22
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## Power battery
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- [[battery]] - [[l76-dat]] - [[super-cap-dat]]
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-- [[XH-414H]]
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+- [[XH-414H]] - [[ohm-dat]]
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Tech-dat/power-dat/battery-dat/lithium-battery-dat/lithium-battery-dat.md
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- [[lithium-ion-battery-dat]] - [[18650-dat]]
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+- [[LiFePO4-Battery-dat]]
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+- [[BMS-dat]] - [[battery-charger-dat]]
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+
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+
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+## Li-ion VS Li-Poly Battery
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| Feature | **Li-ion Battery** | **Li-Poly Battery** |
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|-----------------------|----------------------------------------------------------|----------------------------------------------------------|
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| **Cost** | **More cost-effective** per unit of energy and storage, especially in larger battery configurations. | **Slightly more expensive** to manufacture due to the polymer design and materials used. |
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| **Performance in Extreme Temperatures** | Li-ion batteries generally have a **wider operating temperature range**, but may degrade faster in high or low temperatures. | Li-Poly batteries are more **sensitive to extreme temperatures**, potentially leading to quicker degradation in high heat or low cold, though this can depend on the specific chemistry used. |
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| **Environmental Impact** | **Higher environmental impact** due to the complexity of materials and disposal, though efforts are being made for recycling improvements. | Typically **lower environmental impact**, with polymer materials that can be easier to recycle than the metals used in Li-ion batteries. However, both types still have significant environmental concerns. |
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+
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+
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+## Low Battery Voltage (Below Safe Threshold)
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+
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+Protection boards are designed to protect lithium batteries from over-discharge, overcharge, and short circuits. Many lithium battery protection circuits cut off the battery's output if the voltage drops below a certain threshold, often around 2.5V to 2.8V.
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+
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+If the battery is at **2.6V**, it's very close to this cutoff threshold, and the protection circuit may be designed to prevent any further discharge to avoid damaging the battery, which could explain the drop to 0V.
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+
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+
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+
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+
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+## Lithium battery Check
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+
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+- battery voltage B+/B- = OK, output == 0V, BMS problem
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+
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+
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+## ref
Tech-dat/power-dat/battery-dat/lithium-battery-dat/lithium-ion-battery-dat/LiFePO4-Battery-dat/LiFePO4-Battery-dat.md
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Suitable for applications like power tools or outdoor equipment.
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4. Eco-consciousness:
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-LiFePO4 batteries are free of cobalt, which is often associated with environmental and ethical issues.
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+LiFePO4 batteries are free of cobalt, which is often associated with environmental and ethical issues.
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+
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+
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+
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+
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+
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+## safest battery - Lithium Iron Phosphate (LiFePO4)
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+
8
+The safest batteries to use, especially in terms of preventing fires or explosions, are Lithium Iron Phosphate (LiFePO4) batteries. They are known for their thermal and chemical stability compared to other lithium-ion batteries. Here are some key points about them:
9
+
10
+- Safety: LiFePO4 batteries are less likely to overheat, catch fire, or explode because of their higher thermal runaway threshold. They also have better stability during overcharging and short-circuit conditions.
11
+- Longer lifespan: These batteries tend to last longer than other types, reducing the need for frequent replacements.
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+- Stable chemistry: Their chemical structure is more resistant to thermal changes, which makes them safer even in extreme conditions.
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+
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+- LiFePO4 - https://www.youtube.com/watch?v=07BS6QY3wI8&ab_channel=HighTechLab
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+
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+