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FORUMS General Gear Talk Flash and Studio Lighting
Thread started 28 Jan 2018 (Sunday) 20:55
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NP-F970 Battery?

 
kcrossley
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250 posts
Joined Feb 2009
Williamsburg, VA
Jan 28, 2018 20:55 |  #1

I want to pickup a few extra NP-F970 batteries for my new Aputure Amaran HR672 LED light kit, but I'm clueless when it comes to batteries. The batteries that came with it have this information printed on it:

NP-F960/F970 7.4V 53.28Wh

When I went battery shopping, the first two sets of numbers were easy to find, but I found the last number varied quite a bit from unknown brand to unknown brand. What does that last number mean and does it matter? Any help and/or recommendation is very much appreciated.


Cameras/Lenses: Canon 80D, Canon 70D, Canon 18-55mm, 50mm, 10-18mm, and 55-250mm Lenses
Accessories: Case Logic SLRC-206 Backpack, Canon Speedlite 430EX III-RT, Canon RC-6 Wireless Remote, Davis & Sanford TR653C-V9 Carbon Fiber Tripod, Aputure Amaran HR672 LED Light Kit, Kamerar DF-1M Softboxes

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oldvultureface
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Joined Jun 2008
Northwest Indiana USA
Jan 29, 2018 08:51 |  #2

The last number (53.28Wh) refers to how much energy the battery contains. 53.28Wh divided by 7.4V equals 7.2Ah. Theory says one can drain 1 amp from the battery for 7.2 hours before the battery is totally discharged.




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kcrossley
THREAD ­ STARTER
Senior Member
250 posts
Joined Feb 2009
Williamsburg, VA
Jan 30, 2018 17:06 as a reply to oldvultureface's post |  #3

So if the LED light draws 4 Amps at full power about how much time should I get out of these batteries? BTW, this light also takes 45 watts of power. How does that factor into all of this?

And finally, I read that the more you use a lithium battery, the longer it will last. Any truth to that?


Cameras/Lenses: Canon 80D, Canon 70D, Canon 18-55mm, 50mm, 10-18mm, and 55-250mm Lenses
Accessories: Case Logic SLRC-206 Backpack, Canon Speedlite 430EX III-RT, Canon RC-6 Wireless Remote, Davis & Sanford TR653C-V9 Carbon Fiber Tripod, Aputure Amaran HR672 LED Light Kit, Kamerar DF-1M Softboxes

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oldvultureface
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Northwest Indiana USA
Jan 30, 2018 17:23 as a reply to kcrossley's post |  #4

7.2Ah/4A=1.8h if the battery's rating is accurate.
Lithium cells have a finite lifetime regardless of use. Frequent use doesn't mean longer life.




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kcrossley
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Senior Member
250 posts
Joined Feb 2009
Williamsburg, VA
Jan 30, 2018 19:47 as a reply to oldvultureface's post |  #5

So, all things being equal, does it make since to look for batteries with a higher Wh value?


Cameras/Lenses: Canon 80D, Canon 70D, Canon 18-55mm, 50mm, 10-18mm, and 55-250mm Lenses
Accessories: Case Logic SLRC-206 Backpack, Canon Speedlite 430EX III-RT, Canon RC-6 Wireless Remote, Davis & Sanford TR653C-V9 Carbon Fiber Tripod, Aputure Amaran HR672 LED Light Kit, Kamerar DF-1M Softboxes

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oldvultureface
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Joined Jun 2008
Northwest Indiana USA
Post has been edited 23 days ago by oldvultureface.
Jan 30, 2018 21:27 |  #6

kcrossley wrote in post #18552939 (external link)
So, all things being equal, does it make since to look for batteries with a higher Wh value?

As long as the claimed capacity is reasonable.




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John ­ from ­ PA
Cream of the Crop
7,686 posts
Joined May 2003
Southeast Pennsylvania
Jan 30, 2018 21:50 |  #7

A high capacity equivalent might be https://www.bhphotovid​eo.com ..._battery_pack_f_son​y.html (external link)




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NP-F970 Battery?
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