期間找到不少安卓使用者分享手機免電池直供電的方法，綜合使用鋰電池的經驗發現，可以嘗試利用電池電路板焊接上USB線，透過5V直供電就可以，但因機型不同而有各種小狀況，修改M8的經驗是，需搭配1.5A以上的充電頭才可順利開機；手機電量有從100%掉至1%的情形，有趣的是，電量就會停在1%，電池圖示會有一斜線，應該是錯誤的意思吧?手機指示燈會一直閃爍，但不會自動關機，這個狀態已經保持3周以上，對我來說是可以接受的。
有網友分享從手機充電孔拉線到電池電路板，但因為施工空間很小不容易焊接，再者，測試期間，機身裸背才發現M8的發熱量頗大，不精確的測試，開啟省電模式時，主機板溫度會落在攝氏40度左右，如果開啟” CPU效能最大化”溫度會升到攝氏50度以上，有燙手的程度，因為現在的需求是定點撥放所以裸背使用剛好可以讓M8散熱；平常會不定期從另一支手機用sendanywhaere APP無線傳檔到M8中，這樣操作了一兩年都沒問題，但後來卻頻頻傳檔失敗，修改成直供電後無線傳檔就正常了，不過相機抖動的問題還是無解。
如果擁有M8且想嘗試改直供電的朋友，可以參考以下內容。
順便機翻讓有需求的英語系網友參考~
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boot HTC M8 by direct power supply without battery! use Android phone without battery
The M8 mobile phone was purchased in 2015, because some necessary functions have broken down and are not worth repairing, so it will be officially replaced in 2020, because there is a place in the home that nonstop plays ambient music 24/7 , just let the M8 take this job, but a modern common problem with smartphones is that the battery will swell when plugged in and charged for a long time. When the charging cable is unplugged, the phone will also be cut off at the same time. At this time, the idea of removing the battery and allowing the phone to use USB 5V power directly , and it took some time. Time to search for other users of M8 to share relevant experience, maybe I'm not lucky enough to find it.
Many Android users shared the method of direct power supply without battery for their phones. Based on the experience of using lithium batteries, I found that I can try to use the battery circuit board to solder the USB cable, and it can be directly powered by 5V, but there are may meet various small probleams depending on the model. The experience of modifying the M8 is that it needs to be equipped with a charging head above 1.5A to boot smoothly; the power of the mobile phone always drops from 100% to 1%. Interestingly, the power will stop at 1%. There will be a slash in the icon, which should mean something wrong? The indicator light of the mobile phone will keep flashing, but it will not automatically shut down the M8. This state has been maintained for more than 3 weeks, which is acceptable to me.
A netizen shared that the cable is pulled from the charging hole of the mobile phone to the battery circuit board, but because the construction space is small, it is not easy to solder. Moreover, during the test, found M8 generates a lot of heat. The following test was not accurate(by hand), in the power saving mode, the temperature of the mainboard will rise to about 40 degrees Celsius. In "CPU Performance Maximization", the temperature will rise to more than 50 degrees Celsius, which is quite hot to touch. For my demend, it is just right to use it with a bare back. Let the M8 dissipate heat; usually, I will use the sendanywhaere APP to wirelessly transfer files from another mobile phone to the M8 from time to time. This operation is no problem for a year or two, but then the file transfer fails frequently. After changing to direct power supply, the wireless file transfer function back, but the camera shake problem is still unresolved.
If you have an HTC M8 and want to try to change the direct power supply, you can refer to the following content.
- 參考網上的更換電池步驟，將電池取下，然後小心將電池與上方的電池電路板分離；如果電池的蓄電量還有50%以上也可以焊接一個” 鋰電池充放電保護一體模組”把這顆退役電池當行動電源繼續玩樂使用，這種小模組網拍上有很多種，經濟實惠的”香水版”幾塊錢台幣就一個，小巧好用。
- Refer to the battery replacement steps on the Internet, remove the battery, and then carefully separate the battery from the upper battery circuit board; if the battery’s storage capacity is still more than 50%, you can also weld a "lithium battery charge and discharge protection integrated module" Use this decommissioned battery as a power bank to continue to play. There are many kinds of this small module are easy to find on the onlinemall. Cheap and easy to use.
- 電池電路板上會有清楚標示B+、B-，也就是電池的正負極，找一條手機充電線，將正極焊接到B+，負極焊接到B-。
- There will be clearly marked B+ and B- on the battery circuit board, that is, the positive and negative poles of the battery. Find a mobile phone charging cable and solder the positive pole to B+ and the negative pole to B-.
3.完工照
3.Completion photo
4.改直供電後，電量會停在1%，電池圖示顯示異常，但手機可持續開機使用。
4.After changing the direct power supply, the power will stop at 1%, and the battery icon will display abnormally, but the phone can continue to be used.
5.手機搭配使用的5A充電頭
5. 1.5A charging head for mobile phone.
