If a device needs 5 times the power of 12 pcs of NiMH AA batteries with 2200 mAH . What would be a good battery pack for the 5 times capacity? the problem with car battery is it has acid in it. With lithium ion, it can easily burn. I need the safest batteries. Maybe one simply use 5 times the amount of NiMH AA batteries with same 2200mAh capacities?

 

A safer battery for 12 volts is a 12V 100Ah LiFePo4 Lithium Iron Phosphate battery. It's a whole lot bigger than a couple AA's. Hopefully this will redirect your search to see if you can find LiFePo's in the AA size and the amperage you want.
Click this link
https://search.yahoo.com/search?p=1...+battery&fr=yfp-t&fr2=p:fp,m:sb&ei=UTF-8&fp=1

 

These:
https://www.amazon.com/LifePO4-Solar-Batteries-IFR14500-Rechargeable/dp/B0C1GP5DFV/ref=sr_1_17_sspa
are AA batteries but they're only 1000mA. They're Solar Garden Lights batteries. You're asking for something with more than twice the capacity.

You can likely find these quickly at WalMart (assuming you're in America). Outside of the states I don't know where you'd find them.

 

If a device needs 5 times the power of 12 pcs of NiMH AA batteries with 2200 mAH . What would be a good battery pack for the 5 times capacity?

By "Five times the power" what do you mean? 16 volts?
By "Battery pack" are you looking for something not necessarily AA size batteries?

What voltage do you need? YOu've stated a need for 2200mAH but you don't say what voltage. We can make assumptions but - - - .

 

I suspect he mean capacity, not power.

He said, rephrasing, five tines the capacity of 12x NimH 2200 mAh.

That would be a capacity of 12 x 1.2V x 2.2Ah = 31.7 Wh. A voltage would be helpful and then we could state the capacity in Ah

 

I suggest asking the thread starter to go into detail, including the desired voltage, current capability, and useful discharge time. That information should be understood by the TS, or at least the requirements could be elaborated to make them clearer.
And certainly welcome the TS by showing that we do want to help with a correct answer, rather than guesses.

 

I have 2 equipments.

one is a single channel amplifier

one is a multichannel amplifier (4 channel)

both same brand

the latter needs more ampere and power (4 times), is it not.. both are 12 V..

so what's wrong saying I need 4 or 5 times the power.. should it be 4 or 5 times the current?

 

In this case, given that the voltage is the same for each, either current or power is multiplied the same.

 

A D-cell NiMH battery has about 10,000mAh capacity.
Would that be sufficient?

 

so what's wrong saying I need 4 or 5 times the power.. should it be 4 or 5 times the current?

[edit]
In our world it's understood that twice the amperage at a given voltage is four times the power. Power is measured in watts.
[end edit]. I've been corrected.

 

I have 2 equipments.

one is a single channel amplifier

one is a multichannel amplifier (4 channel)

both same brand

the latter needs more ampere and power (4 times), is it not.. both are 12 V..

so what's wrong saying I need 4 or 5 times the power.. should it be 4 or 5 times the current?

Power is measured in Watts (W), it is equal to Voltage (V, Volts) times Current (A, Amps, or C in some formulas)
Power is a measure of how much work can be done. For example, Horsepower (HP) can be directly converted to W.

Voltage is mearsured in Volts (V). Voltage is a measure of electrical potential. You can think of it a little like pressure—though this is a very limited analogy. The higher the voltage the more resistance it can overcome.

Current or Amperage is measured in Amps (A). Current is a measure of the amount of charge that is being moved. It is a little like flow—but again that is a weak analogy. Amperage is a rate, it is number of electrons past a point per unit time.

In the case of batteries, wiring cells in a series—that is, connecting them end to end—will increase the voltage. Wiring them in parallel—that is. connecting them like the rungs of a ladder between the wires—will increase current, and capacity, the total amount of current available as a function of time, measured as Amp-hours (Ah) or for smaller batteries, Milliamp-hours (mAh).

Practical battery ratings include a discharge rate in A because the cells they are made of exhibit different capacities depending on how quickly you try to drain them. So a typical rating might look like 1500mAh@1A. I am omitting a discussion of C, which is a battery parameter you can read about it if interested.

 

In our world it's understood that twice the amperage at a given voltage is four times the power.

I. Don’t. Think. So.

 

In our world it's understood that twice the amperage at a given voltage is four times the power. Power is measured in watts.

Sorry Tonyr, that's just your world.

 

I don't want to use my former NiMH AA batteries because a child got hold of one a few weeks ago, inserted it into his toy, and the plastic covers got punctured and the positive and negative shorted and the battery heated and smoked, nearly causing a fire. This is because the negative of a NiMH cell is very closed to the top positie or composed of the entire body. So I threw all 25 pcs of my NiMH AA batteries away thinking they could be fake Eneloop. I need 12V batteries where the positive and negative are farther apart than the mere 2 millimeter distance in the NiMH AA. What design where they are farthest distance and overcharge won't cause it to burn too like Lithium Ion batteries?

 

I. Don’t. Think. So.

The way that what he is describing works is that for a specific load, if you double the volts you will thus also double that current, and THAT will give 4 X the watts (Power). A bit of difference.

SO, if you double the current BY DOUBLING THE VOLTAGE, THEN you would have 4 X the power.

The difference being that in the case of what we are discussing it is increasing the load that demands an increase in current. The voltage is not changed. And for a constant voltage, the POWER (watts) is directly proportional to the current.

 

The way that what he is describing works is that for a specific load, if you double the volts you will thus also double that current

True.
Be he said:

twice the amperage at a given voltage is four times the power

which to me implies the load resistance is lowered to increase the current and the voltage does not change.

 

I. Don’t. Think. So.

Sorry Tonyr, that's just your world.

True.
Be he said:
which to me implies the load resistance is lowered to increase the current and the voltage does not change.

I stand corrected.

 

I stand corrected.

Tony, do you have a standing desk?

 

Tony, do you have a standing desk?

Well, I have a couple work stations. Where I tinker with electronics I can sit or stand. In the wood shop I do a lot of standing. It's hard on the back. To be honest, I don't quite understand the point of the question.

 

In the following image, note the positive top metal is only separated from the negative body by 1mm or less, so it is very easy to short a Ni-MH AA batteries and even a kid just inserting the positive side to the spring in battery compartment can cause the short which can burn the battery.

I threw all the 25 pcs of NiMH AA. What kind of 12V batteries where the positive and negative are so far apart there are no possibilities of accidental short when inserted to spring edges in negative polarity of say toy battery compartments? As well as fulfilling my high ampere requirement (due to 4 channel amplifier in one unit instead of just single channel).