Will someone explain battery mAH please ?
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penbat

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I need a 9V rechargeable battery for my XP-7 but have seen a variety of a 9V batteries with different mAH values. Will someone please explain.
 
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ipodstudio

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"A battery with a capacity of 100mAh can supply 100mA for one hour, or 10mA for 10 hours etc.One mAh is the equivalent of 3.6 coulombs of charge."

Quoted from Jaycar Electronics Reference Data Sheet: BATTGLOS.PDF (2)
 
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penbat

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Oh thanks. What would be better for my XP-7, 150mAh or 2200mAh ?
 
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ipodstudio

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Think I'll let someone with a little more technical competence than I answer this one. I'd have assumed the latter as long as it's compatible with the amp.
 
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Juergen

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Quote:

Originally posted by penbat
Oh thanks. What would be better for my XP-7, 150mAh or 2200mAh ?


In general the higher the better. The 2200mAh should last longer.
 
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mAh refers to the length of battery life (milliamp-hours).

Take an amp that uses 20mA steadily. If the battery was rated at 20mAh, it would last one hour before needing to be recharged. if it was 200mAh, it would last 10 hours. 2000 mAh, 100 hours.

In reality, the battery drain of an amp fluctuates depending on the volume and dynamic range of the music, but it's usually possible to calculate an average.

P.S... in the case of battery packs (more than one battery of the same mAh wired in series) you would use the mAh of a single battery rather than adding them all together. So a 16-cell battery pack using 1.2v 1800 mAh "AA" cells (supplying 19.2v) would have a lifespan of 1800 mAh.
 
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penbat

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Thanks. Can you undestand why a battery maker offers a 9V battery with a high mah and another 9V battery with a low mah for the same price ?
 
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fewtch

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Quote:

Originally posted by penbat
Thanks. Can you undestand why a battery maker offers a 9V battery with a high mah and another 9V battery with a low mah for the same price ?


The battery with lower mAh is probably just older technology, but for whatever reason was never reduced in price. Also, brand probably has something to do with it... well known name brands tend to get priced higher (and *might* be better quality, depends). Also, highly rated brands (by buyers) also tend to get priced higher.
 
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