[@香港熊@]

A1省電的本領讓筆者嘆為觀止: 實地拍攝時，開啟 LCD、每張並 review 兩秒，結果拍完一張 1GB Microdrive(660張照片)，電池顯示仍滿格。
by dcview

[butler]

A1省電的本領讓筆者嘆為觀止: 實地拍攝時，開啟 LCD、每張並 review 兩秒，結果拍完一張 1GB Microdrive(660張照片)，電池顯示仍滿格。

but,beside the noise problem is a bit better,
image quality seems very similiar to 7i/hi.

[austinshao]

A1好啊，但價錢實在太高！我都係會選擇dslr
唔知兄台你幾錢買入？

[butler]

oh
sorry
forget to post the photo link

http://www.dcview.com/article/newreadarticle.asp?id=2220

it is not taken by me..........

[Jimluk]

I have no idea on the price of A1.
What is the price of A1 ?

[老叟]

A1改高電壓,相對電流減小,造成省電假象之嗎!!
記著,專用電(proprietary battery)好貴,唔好到時牙痛咁聲搵代電至好!!
A1價錢未知,聽講訂價美金千二到喇!!

[ninekit]

dear 老叟 hing,

may i ask whats the ground for your statement?

or its just your guess?

there is no reason why A1 can't be a power saver over the time of continuous R&D in my opinion.

[Gestapo]

>>A1改高電壓,相對電流減小,造成省電假象之嗎

Don't understand! According to my limited knowledge in Physics,

P=IV

If you increase the V(電壓), the I (電流) will decrease but P (power consumption) is the same! How can it be a 假象? However I "guess" if the current decrease, there will be less heat generated. A1 will no longer be as hot as 7Hi/7i, a little bit energy loss due to heat loss may be saved.

[Elliott]

我諗 老叟兄 可能係想指... A1電池既電容量 比 7i/7Hi略高(以4.8V 1850mAh為例), operation既時間長左都係正常既。 唔一定係A1省電左, 可能只係電容量高左咁解...

但從另一方面睇 如果A1既電量真係如dcview所說般強勁的話... A1真的應該係比7i/7Hi省電了不少....

[sevensister]

對比 7Hi
A-1 最少有3項措施加強續航力

1. 新的 Cxprocessor II 比現有 Cxprocessor 製程更佳更省電
2. 降低連拍能力, 減低 DSP 功耗\n3. 放棄 AA 電池, 採用更大容量的專用鋰電

其中 #3 是最重要的,
表面上雖然電池一般都標明所含電壓, 容量等資料
但其實電池的容量愈大，
電流輸出能力也愈大，
所謂的電流輸出能力是指在
"不使電壓明顯下降的情況時，可以連續輸出的電流大小"，
電學上有一個名詞叫做「電壓調整率」，
是用來評估電源系統的能力好壞。

電壓調整率=(無載電壓-滿載電壓)/滿載電壓*100%

電壓調整率的值愈低愈好，即無載電壓=滿載電壓，
這個當然是理論值，事實上是不可能的，
電池也一樣，負載後電壓一定會下降，
至於降幅多少，就要取決於負載阻抗的大小及電池本身的內阻。

結論就是:
電池容量大=電池內阻低=輸出電流大=能提供功率大=電壓調整率低=負載後電壓下降少。

這就可以解釋為何 4200mAh 的鋰電 比 2100mAh 續航力強不只一倍的原因