Tech-dat/chemistry-dat/chemistry-dat.md
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+# chemistry-dat
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+
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+- [[PCB-cleaner-dat]]
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+
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+- [[battery-leakage-dat]]
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+
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+- [[vinegar-dat]] - [[rust-dat]]
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+
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+
Tech-dat/chemistry-dat/rust-dat.md
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+# rust-dat.md
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+
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+## How to Remove Rust from Metal
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+
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+### 🧼 1. Manual Methods
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+
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+#### β€’ Sandpaper or Steel Wool
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+- Scrub the rusted area until bare metal is exposed.
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+- Use coarse grit (e.g. 80–120) for heavy rust, finer grit (e.g. 220) to smooth.
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+
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+- [[sandpaper-dat]]
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+
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+#### β€’ Wire Brush
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+- Ideal for larger surfaces or rough textures.
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+- Can be handheld or attached to a drill.
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+
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+
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+
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+### πŸ§ͺ 2. Chemical Methods
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+
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+#### β€’ White Vinegar (Acidic Method)
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+- Soak small metal parts in vinegar for several hours.
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+- Scrub off rust with a brush; rinse and dry thoroughly.
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+
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+#### β€’ Baking Soda Paste
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+- Mix baking soda with water to form a paste.
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+- Apply to rusted area, let sit 1–2 hours, scrub, then rinse.
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+
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+#### β€’ Commercial Rust Removers
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+- e.g. **Evapo-Rust**, **WD-40 Rust Remover Soak**
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+- Follow the product's safety instructions and soak time.
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+
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+### ⚑ 3. Electrolysis (Advanced)
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+- Requires a DC power source (like a car battery charger), washing soda, and a sacrificial steel electrode.
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+- Effective for removing deep rust without damaging the metal.
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+
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+### βœ… Aftercare
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+- **Rinse** thoroughly and **dry completely**.
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+- Apply a **protective oil**, paint, or rust inhibitor to prevent future rust.
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Tech-dat/power-dat/battery-dat/9V-battery-dat/9V-battery-dat.md
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+# 9V-battery-dat
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+
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+## Common Names for the 9V Battery
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+
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+### IEC and ANSI Designations:
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+- **IEC: 6LR61** (alkaline)
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+- **IEC: 6F22** (zinc-carbon)
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+- **ANSI: 1604A** (alkaline)
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+- **ANSI: 1604D** (zinc-carbon)
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+
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+### Common Names:
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+- **9V battery**
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+- **PP3 battery** (original series name from the manufacturer Ever Ready)
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+- **E-block** battery
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+
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+### Typical Chemistry Types:
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+- **Alkaline** (most common consumer version)
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+- **Lithium** (longer life, lighter)
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+- **Nickel-metal hydride (NiMH)** (rechargeable)
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+- **Zinc-carbon** (cheaper, shorter lifespan)
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+
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+### Common Uses:
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+- Smoke detectors
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+- Guitar pedals
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+- Radios
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+- Multimeters
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+
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+## Typical Discharge Current of a 9V Battery
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+
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+### 1. **Alkaline 9V Battery (e.g., Duracell, Energizer)**
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+- **Continuous current**: ~15–50 mA (milliamps)
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+- **Peak current**: Up to **400–500 mA** (for short bursts)
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+- **Capacity**: ~500–600 mAh (at low drain)
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+
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+### 2. **Zinc-Carbon 9V Battery**
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+- **Continuous current**: ~5–15 mA
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+- **Peak current**: ~100–200 mA
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+- **Capacity**: ~400–500 mAh
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+
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+### 3. **Lithium 9V Battery**
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+- **Continuous current**: Up to **120–200 mA**
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+- **Peak current**: Often **500–1200 mA**
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+- **Capacity**: ~1000–1200 mAh
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+
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+### 4. **Rechargeable 9V Batteries**
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+- **NiMH (Nickel-metal hydride)**:
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+ - **Typical current**: 50–100 mA continuous
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+ - **Peak current**: ~200–400 mA
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+ - **Capacity**: ~150–300 mAh
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+
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+### Notes:
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+- Drawing high current continuously will **reduce battery life** quickly.
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+- Actual current delivered depends on the **internal resistance** and **load**.
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+
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+
Tech-dat/power-dat/battery-dat/alkaline-battery-dat/AA-battery-dat/AA-battery-dat.md
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+# AA-battery-dat
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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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+- [[battery-leakage-dat]]
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Tech-dat/power-dat/battery-dat/alkaline-battery-dat/AAA-battery-dat/AAA-battery-dat.md
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+# AAA-battery-dat
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+
Tech-dat/power-dat/battery-dat/battery-charger-dat/battery-charger-dat.md
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The most following charger options are for the lithium-ion battery
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-## Compare
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-
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-| Type | Feature | charge-current |
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-| -------- | --------------------------------- | -------------- |
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-| TP5000 | Li-MnO2, LiFePO4(LFP) charger IC, | 0.5A |
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-| MCP73831 | 0LED indicator | 0.5A |
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-| TP4056 | Linear charging | ~1A |
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-| TP4054 |
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## Chip Info
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- [[OPM1193-dat]] - [[OPM1156-dat]]
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+
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+## Compare
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+
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+| Type | Feature | charge-current |
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+| -------- | --------------------------------- | -------------- |
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+| TP5000 | Li-MnO2, LiFePO4(LFP) charger IC, | 0.5A |
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+| MCP73831 | 0LED indicator | 0.5A |
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+| TP4056 | Linear charging | ~1A |
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+| TP4054 |
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+
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+
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+
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+
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## Quick-Charge QC Options
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* FP6719 / FP6717 / FP6291 DC-DC Boost
Tech-dat/power-dat/battery-dat/battery-dat.md
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- [[battery-holder-dat]]
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-- [[alkaline-battery-dat]]
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+- [[alkaline-battery-dat]] - [[9V-battery-dat]]
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## coin battery dat
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Tech-dat/power-dat/battery-dat/battery-leakage-dat/battery-leakage-dat.md
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+# battery-leakage-dat
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+## AA Battery Leakage After Long-Term Disuse
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+
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+### Professional Term:
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+- **Electrolyte leakage**
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+- **Battery leakage**
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+- More technically: **Battery electrolyte leakage due to self-discharge and chemical decomposition**
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+
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+### Causes:
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+- **Zinc corrosion** over time
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+- **Gas buildup** inside the battery
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+- **Seal failure**, leading to leakage
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+- **Chemical degradation** of the battery's internal components
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+
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+### Common Leakage Substance:
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+- **Potassium hydroxide** (from alkaline batteries)
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+ - A caustic and corrosive substance that can damage electronics and surfaces
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+
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+### Notes:
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+- Most common in **alkaline** and **zinc-carbon** AA batteries
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+- Happens especially when batteries are **stored unused for extended periods**
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+
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+### Prevention Tips:
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+- Remove batteries from unused devices
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+- Store batteries in a cool, dry place
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+- Use newer batteries with better sealing technology
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+
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+
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+## ref
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+
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+- [[AA-battery-dat]]
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Tech-dat/power-dat/battery-dat/battery-soldering-dat/battery-soldering-dat.md
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+# battery-soldering-dat
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+
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+ζ”―ζŒη‚Ήη„Šι•η‰‡γ€ι“η‰‡γ€δΈι”ˆι’’η‰‡η­‰ε€šη§ζθ΄¨εΌΊεŠ²ε€šθƒ½οΌŒη„ŠζŽ₯η‰’ε›ΊοΌŒη„Šη‚ΉδΌ˜θ‰―
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+
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+Support spot welding of nickel sheets, iron sheets, stainless steel sheets and other materials. Strong and versatile, strong welding, excellent welding points
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+
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+## ref
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+
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+- [[battery]] - [[18650]]
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Tech-dat/power-dat/battery-dat/rechargerable-battery-dat/lithium-battery-dat/li-battery-size-dat/li-battery-size-dat.md
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+# li-battery-size-dat
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+- [[18650-dat]] - [[21700-dat]] - [[26650-dat]] - [[32650-dat]] - [[32700-dat]] - [[A123-battery-dat]] - [[LFP-battery-dat]] - [[LTO-battery-dat]] - [[LTO-18650-battery-dat]] - [[LTO-26650-battery-dat]] - [[LTO-32700-battery-dat]] - [[LTO-32650-battery-dat]]
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+
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+- [[pouch-battery-dat]]
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+
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+
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+- 21700: 21mm diameter, 70mm length. Increasingly popular, offering higher capacity than 18650.
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+- 26650: 26mm diameter, 65mm length. Larger capacity and often higher discharge current capability than 18650.
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+- 14500: 14mm diameter, 50mm length. Same physical size as a standard AA battery.
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+- 16340: 16mm diameter, 34mm length. Same physical size as a CR123A battery.
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+- 10440: 10mm diameter, 44mm length. Same physical size as a standard AAA battery.
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+- 32650 / 32700: 32mm diameter, 65mm or 70mm length. Often used for LiFePO4 chemistry, providing high power and capacity.
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+
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+
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+## ref
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+
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+- [[18650]]
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