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Help understanding Bolex battery power (amp hours)


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#1 Craig Knowles

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Posted 22 August 2005 - 12:24 AM

Can someone please explain to me the concept of "amp hours" in the context of battery power?

I have a Bolex EBM, which takes an internal "12v 1.2Ah" (amp hour) battery. I'd like to use an external source, specifically a Bescor 12v battery belt. Shelton Communcation has a Bescor "12v 3.4Ah" battery.

1) Is it safe to use this a "12v 3.4 Ah" battery with the Bolex, or will the "3.4 Ah" somehow overload the camera, as it only requires "1.2 Ah"?

2) Or, is Ah a measure of current over time and thus not at all related to power?

3) If this were the case, then could I use, say a "12v 14Ah" battery without frying the camera as well?

Thanks in advance,
Craig
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#2 Evan Kubota

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Posted 22 August 2005 - 12:39 AM

Amps are a measure of current over time, as you said. The camera will only draw what it needs - if the current the camera draws is (estimate - not accurate) 2 A, a 3.4 A battery will give you around 85 minutes of operating time. As long as the voltage is the same as the internal battery you're fine.

Can someone please explain to me the concept of "amp hours" in the context of battery power?

I have a Bolex EBM, which takes an internal "12v 1.2Ah" (amp hour) battery.  I'd like to use an external source, specifically a Bescor 12v battery belt.  Shelton Communcation has a Bescor "12v 3.4Ah" battery.

1) Is it safe to use this a "12v 3.4 Ah" battery with the Bolex, or will the "3.4 Ah" somehow overload the camera, as it only requires "1.2 Ah"?

2) Or, is Ah a measure of current over time and thus not at all related to power?

3) If this were the case, then could I use, say a "12v 14Ah" battery without frying the camera as well?

Thanks in advance,
Craig

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Visual Products

Aerial Filmworks

Opal

Willys Widgets

CineTape

Paralinx LLC

Ritter Battery

Rig Wheels Passport

rebotnix Technologies

CineLab

Abel Cine

Technodolly

The Slider

Glidecam

Metropolis Post

Media Blackout - Custom Cables and AKS

Gamma Ray Digital Inc

FJS International, LLC