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Author Topic: basic mAh question  (Read 1445 times)

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Offline woodbine

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basic mAh question
« on: March 28, 2014, 07:15:30 PM »
Forgive my ignorance on this.
Our portable mixer/recorder takes a floating 5-18v from an external power pack. I am looking at using NiMh RC packs, but here's the bit I don't quite get. The shop sells various capacities and various voltages, but the best fit in size and weight is a 9.6v @ 2500mAh (that's 8 x 2500mAh AA's)
The mixer takes 4 x 2700mAh AA NiMh internally and I get 4 hours of up time. So that's 4 hours from a 4.8v @ 2700mAh source.
The way I see it is that at 9.6v the mixer will demand less current than at 4.8v, so the 9.6 pack should last longer.....

Offline woodbine

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Re: basic mAh question
« Reply #1 on: March 28, 2014, 07:44:58 PM »
Perhaps should mention mixer is SD552 and it has to all fit in a Petrol bag. I know the usual setup is an NP1 style battery, but they are horrendous prices once you add in the charger and cup.

stevetoney

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Re: basic mAh question
« Reply #2 on: March 28, 2014, 09:53:30 PM »
You'll actually get less runtime with the 9.6v battery because it's got 200 mah less capacity than the other battery you specify.
« Last Edit: March 29, 2014, 09:30:07 AM by tonedeaf »

Offline woodbine

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Re: basic mAh question
« Reply #3 on: March 29, 2014, 07:17:11 AM »
So voltage doesn't really come into the run time equation I take it?
Last night I read through some past posts in Remote Power and I am leaning towards solutions from Anker, Naztech or RavPower. They all make a high capacity Li-on recharger unit with a 9 or 12v output. Taking into account the conversion loss from 3.7v to 9 or 12v, they all seem to have a good capacity.
If I bought one of these batteries and ran it at 9v, would that give better run time than 12v? The SD552 takes a wide voltage range.

Offline woodbine

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Re: basic mAh question
« Reply #4 on: March 29, 2014, 07:43:31 AM »
One more question...the DC-DC cables that come with Anker, Naztech etc, are they twin core/screened or single core screened? I am going to want to put a Hirose on one end for the 552 and prefer to use original cable.

 

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