市面上常見的18650電池容量 - Android
By Daniel
at 2013-05-18T12:01
at 2013-05-18T12:01
Table of Contents
之前晚上睡不著，用手邊的零件做了一個容量測試器
很簡單，1個小時就做好了
http://i.imgur.com/651U2Ft.jpg
手邊沒有MOSFET所以沒辦法做有定電流的電子負載
試了手邊幾顆電池，大概確定了各家的放電特性
==============================================================
先來看看18650電池
http://i.imgur.com/uAujxwD.png >>18650
以下是市面常見的18650電池
http://i.imgur.com/5JlqKe0.jpg
從左至右
標示容量(mAh) 售價(NTD)
1.松下 NCR18650 2900 115
2.神火 BRC18650 3000 80
3.三洋 UR18650FM 2600 105
4.三星 ICR1865030B 2950(@4.35V) 110
5.三星 ICR1865026F 2600 74
6.松下 NCR18650B 3350 175
7.松下 NCR18650A 3070 138
數據取自官方Data Sheet
-------------------------------------------------------------
http://i.imgur.com/RKlEHMs.jpg
用行動電源充到4.2V 開始定電阻放電至3.0V
由於是定電阻放電，跟標示容量會有小差異
以下是結果
http://i.imgur.com/jSO0Xq1.jpg
--------------------------------------------------------------
簡單分析:
以一般行動電源的環境(4.2V~3.2V)
松下其低伸的放電曲線會導致一部分容量在截止線下
但還是領先對手
三星SDI30B 為高壓鋰電池需充電至4.35V
如果只充電至4.2V甚至連SDI26F也比不上
行動電源不建議
神火就沒什麼好說了，我買了4顆
另外松下的電池的平均放電電壓為3.6V
而三星和三洋的平均放電電壓為3.7V
這也會影響到電池能量容量
把電流數據X電壓 積分後得到:
松下 18650B 11.58Whr
松下 18650A 10.72Whr
松下 18650 9.69Whr
三星 SDI30B 9.40Whr
三星 SDI26F 9.55Whr
三洋 UR18650FM 9.42Whr
神火 BRC18650 3.65Whr
這用來評估行動電源容量會更準確
PS 其中NCR18650 已經使用近兩年
容量已有衰退
-------------------------------------------------------------
測試完後想了滿久的要發在哪個版
後來想想我也是因為Android才會買了這麼多18650....
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Android
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