Batteries issue - 7.2 AH & 7AH???

[Andrew Kiu]

Battery 1
Panasonic (Matsushita)
Valve Regulated Lead Acid Battery
LC-R127CH1
(12v, 7AH/20HR)
Cycle Use: 14.5V – 14.9V
Standby Use: 13.6vV– 13.8V

Battery 2
Newmox (Smith Victor kit battery)
FNC 1272 (12V 7.2 AH)
Cycle use: 14.4-15.0 V
Floating use: 13.5-13.8V

Can anyone explain to me is this 2 batteries pack are the same type? I originally purchased Smith Victor SV950 with Newmox battery “Battery 2
“, and planning to use “Battery 1” as 2nd backup battery.

Please advice me on this matter

My Setup : Xl1s, Ma200, Smith victor SV950 lighting kit

[Rob Lohman]

How are you feeding the XL1S 12v when it wants 7.2v (as in volts,
not amps!)??

[Greg Boston]

Rob,

Looks like he's only powering the on camera light with 12v.

Andrew,

Yes, from the specs you provided, the two batteries are almost identical. When choosing batteries, the voltage must be the same but the capacity (amp-hours) can be different. The higer the amp-hour rating, the longer the battery will last on a single charge.

The 7AH vs. 7.2AH is pretty negligible in your case. Hope this helps.

regards,

=gb=

[Rob Lohman]

Ah, thanks for that Greg. I didn't read that into it.

[Andrew Kiu]

Thanks Rob,

Sorry, I dint get you, what I mean here is the 2 batteries mainly used for Smith victor SV950 lighting kit and the only differences between this 2 batteries is 7.0AH VS. 7.2AH and the Cycle Use…, so I would like to verify if I use 7.2AH/12V will it cause any damage to my SV lighting kit??? (Originally 7.0AH/12V )

[Andrew Kiu]

Thanks Greg!
where can i find more help/ info regarding batteries???

[Rob Lohman]

If the lamp is rated at 7.0 amps this is what current it will draw
from the power source (if used at the specified voltage). So any
source of power needs to be able to AT LEAST give 7 amps. If the
battery kit gives 7.2 that's fine since it is more (giving you longer
times to run the lamp).

[Greg Boston]

Andrew,

About amp-hour rating. It's pretty much what it states.

The 7.0AH battery will supply a current load of 7 amps for 1 hour (only when the battery is fairly new). The 7.2AH would supply 7.2 amps for one hour. You can determine how many amps your light will require by using the following formula.

This is how it was taught to us in college and it helps you remember if you write it down this way. We call it PIE.

_P__
I | E

where P= power in watts, I= current in amps, & E=voltage in volts.

You place your finger over the value you wish to calculate. So, Andrew, if you have a 50 watt camera light and you supply it with 12 volts, you would divide 50 by 12 to solve for I. In this case, I would be about 4.2amps. So, your camera light would run approximately 1.5 to 2.0 hours before the 7AH battery would need to be recharged.

Any textbook on basic DC circuits will provide you this information.

Good luck,

=gb=

[Carlos E. Martinez]

<<<-- Originally posted by Andrew Kiu : what I mean here is the 2 batteries mainly used for Smith victor SV950 lighting kit and the only differences between this 2 batteries is 7.0AH VS. 7.2AH and the Cycle Use…, so I would like to verify if I use 7.2AH/12V will it cause any damage to my SV lighting kit??? (Originally 7.0AH/12V ) -->>>


No, you will not damage your lamp, as the voltage is the same. It will only last one hour on the 7.0 Ah battery and very slightly more on the 7.2 Ah battery.

If it wasn't that the lamp life would diminish, I would leave the lamp on for an hour on the smaller battery to see how long it really lasts with full light.

It's an unusual lamp the SV950 seems to use, because if you multiply 7.0Ah x 12v = 84 watts. Can you check that on the lamp glass? How many watts does it read?


Carlos

[Greg Boston]

According to specs on B&H site, the SV-950 comes standard with a 100watt bulb, although they list lower wattage replacement lamps as well. So Andrew, that means your lamp will consume approximately 8.3 amps and the 7.0AH or 7.2AH battery will run the lamp for less than 1 hour. It's good that you have a spare!

=gb=