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The battery still has fire, but why is the device unpowered?

🔋 The battery still has fire, but why is the device unpowered?

Many people may have encountered the problem of "batteries are still on fire, but the restarter is not stuck," or it is not used for long, it seems that batteries still have capacity left. In fact, the problem may not be caused by "battery capacity" alone, but may be caused by higher "internal resistance" with service life.

A new battery with a low internal resistance value will be able to supply the current at full capacity, allowing the device to run strong, low-power and low-heat, suitable for high-current devices such as electric drills, cars or high-power appliances.

On the other hand, when the battery starts to deteriorate, the internal resistance will increase, resulting in a rapid voltage drop, not fully current supply, so the device is sluggish, falling or sometimes not on, and produces more heat and shorter operation.

A simple summary is that "capacity" tells how long the battery lasts, but "internal resistance" determines whether the battery will have enough force to drive the device.

So when checking batteries, don't just look at Ah or Battery Percentage, because batteries with lights may no longer be able to supply full power.

# Battery # Internal resistance # Mechanic # Electrical knowledge # Technology♪ Battery deterioration ♪ Car ♪ Mechanic work ♪ Knowledge ♪ Battery

5/23 Edited to

... Read moreผมเคยพบปัญหานี้กับรถยนต์ส่วนตัวเองหลายครั้ง แม้จะเช็คว่าแบตยังมีไฟเหลืออยู่ในระดับสูง แต่เวลาสตาร์ตรถกลับต้องพยายามกดกุญแจหลายครั้งกว่ารถจะติด หรือบางทีอุปกรณ์ไฟฟ้าในบ้าน เช่น สว่านไฟฟ้า ก็เริ่มทำงานได้แรงน้อยลงอย่างผิดสังเกต นั้นเป็นเพราะว่า นอกจากความจุแบตเตอรี่ที่บอกว่าเก็บพลังงานได้แค่ไหนแล้ว ค่าความต้านทานภายในแบตเตอรี่ก็มีบทบาทสำคัญมากต่อประสิทธิภาพในการจ่ายกระแสไฟ เมื่อแบตเตอรี่มีอายุมากขึ้น ตัวสารเคมีภายในแบตจะเสื่อมสภาพ ค่าความต้านทานภายในจะสูงขึ้น ทำให้กระแสไฟฟ้าไหลผ่านได้ไม่สะดวกและแรงดันไฟฟ้าตกเร็วกว่าเดิม ผมเคยเปลี่ยนแบตเตอรี่ของเครื่องมือไฟฟ้าที่ใช้ทำงานบ้าน เมื่อได้แบตใหม่ที่มีค่าความต้านทานต่ำกว่าเดิม พบว่าเครื่องมือทำงานได้แรงขึ้นไม่สะดุด เหมาะกับงานที่ต้องใช้กระแสสูง ในทางกลับกันแบตเก่าที่มีค่าความต้านทานภายในสูง แม้ว่าจะชาร์จจนเต็มแล้ว แต่กระแสจ่ายจะไม่พอ ทำให้อุปกรณ์ทำงานไม่เต็มประสิทธิภาพและอาจปิดตัวลงกะทันหัน ดังนั้น การตรวจสอบแบตเตอรี่ควรดูทั้งตัวเลขความจุ (Ah) และอย่าลืมเช็คค่าความต้านทานภายในด้วย ซึ่งสามารถใช้เครื่องมือวัดความต้านทานเพื่อประเมินสุขภาพของแบตได้ รวมถึงอย่ารอให้แบตเสื่อมจนหมดแรงแล้วค่อยเปลี่ยน เพราะแบตที่มีความต้านทานสูงจะส่งผลเสียต่ออุปกรณ์และอาจทำให้เครื่องใช้ไฟฟ้าชำรุดได้เร็วขึ้น สรุปง่าย ๆ คือ แบตเตอรี่ยังดูเหมือนมีไฟเต็ม แต่มันให้พลังงานแรงดันไฟฟ้าได้ไม่พอสำหรับการใช้งานที่ต้องการกระแสสูง แนวคิดนี้ช่วยให้ผมเข้าใจและดูแลแบตเตอรี่ทั้งรถยนต์และเครื่องมือไฟฟ้าได้ดียิ่งขึ้น ทำให้ไม่เจอปัญหาอุปกรณ์ทำงานอืดหรือเปิดไม่ติดบ่อย ๆ อีกเลย

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