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Lou Hilario Inner circle 2235 Posts |
I am using a GP1700Mah 9 volt rechargeable battery for my Sennheisser Headset and it only lasts for 1 hour of use. Is there any rechargeable battery that lasts longer? It takes 16 hours to charge this battery.
Magic, Illusions, Juggling, Puppet & Parrot Show ^0^
http://www.louhilario.net |
bloodyjack Veteran user Seattle WA 343 Posts |
Lou
9 volt rechargeble batteries only give 7.2volts so they will not last very long. Alkaline batteries will give you longer times but if you must use rechargables there are some out there with an extra cell giving you 8.4volts this will last longer. here is the about the best your going to get its 8.4 volts 200maH and NiMH as well http://www.onlybatteries.com/showitem.asp?ItemID=12839.64
"sir i sent you half the kidne i took from one woman prasarved it for you tother piece i fried and ate it was very nise i may send you the bloody knif that took it out if you only wate a whil longer"
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EvanMagic Elite user Manitoba 471 Posts |
Duracell. Check your local battery retailer.
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Dan McLean Jr aka, Magic Roadie Special user Toronto, Canada 804 Posts |
Lou,
Like bloodyjack, I had always heard that rechargeables don't start at a full 9V (or 1.5 for AA), and that is true for most. I have found, though, a brand called Powerex from a company called Maha. They claim their 9V are actually 9.6V and not 8.4V. I use their rechargeable AA for my digital camera, and they work really well. http://shop.mahaenergy.com/store/viewitem.asp?idproduct=273 Cheers! Dan.
Dan McLean Jr
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Lou Hilario Inner circle 2235 Posts |
My battery gives 8.4V output. But after charging, it rates 10V from my battery tester. I'm quite dissapointed with this 9V GP rechargeable battery. I got two. Yes, alkaline batteries still works the best and lasts to about 12 hours.
Magic, Illusions, Juggling, Puppet & Parrot Show ^0^
http://www.louhilario.net |
Andy Leviss Inner circle NYC 1179 Posts |
I'm guessing you're using a voltage meter, not a true battery tester. Meters don't test the battery under a load, so they're meaningless. A battery could read great on a meter, but the second you put a load on it, it puts out next to nothing. Ideally, you want to test it with a load equivalent to the load that your wireless transmitter puts on it.
That all said, don't use rechargeables. There is not a single brand of rechargeable battery on the market today that I trust in a wireless microphone. The one and only time I've seen a rechargeable used in the last couple years was a few months ago, when myself and a few other people from my tour went to see a major Broadway tour that was playing near us, and that it happened I knew the wireless tech on. They had a disastrous moment when, during a key scene in which the actor in question could not possibly have his mic swapped/battery replaced, the rechargeable died suddenly, killing a major sound effect of the show (it relied on some heavy reverb and multi-tap delay to create a nightmarish ghost effect). There's a reason very few Broadway shows dare to use rechargeables, and most who try switch back. --Andy, finishing up the last month doing sound on tour for Sesame Street Live's "Elmo's Coloring Book"
Note: I have PMs turned off; if you want to reach me, please e-mail [email]Andy.MagicCafe@DucksEcho.com[/email]!
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bloodyjack Veteran user Seattle WA 343 Posts |
Quote:
On 2005-05-22 21:54, Dan McLean Jr aka, Magic Roadie wrote: I was not aware of this product it has yet another cell (rechargebles are 1.2volts per cell) This is the best your going to get in rechargable batteries. I would still recomend regular Duracells for radio mics
"sir i sent you half the kidne i took from one woman prasarved it for you tother piece i fried and ate it was very nise i may send you the bloody knif that took it out if you only wate a whil longer"
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fccfp Special user NJ 563 Posts |
I always use a fresh alkaline battary in performance. It's a small investment and it's one less thing that can wrong. I save the ones used in performance and use them in rehersal or when I use my PA for pitching and battery failure would not be a big deal. In performance, it would be very un-profesional. Not necessarily disastourus, but why take the chance?
A.K.A. Jay The Magician
www.jaythemagician.com |
Majiloon Regular user 135 Posts |
As you already know- I have designed battery-charging circuits, and the software chip sets that go with them in my line of business, so I have come to know quite a bit about rechargeable batteries- heck- I even know how to spell
– r-e-c-h-a-r-g-e-a-b-l-e- .. just kibbing. In your original post you said you had a 1700Mah 9-volt battery. I believe this to be a misnomer- unless you are mistaken and have a Lithium (non-rechargeable battery). 9 volt batteries generally speaking are limited in their power – but not because of the “voltage”… it is because of the mAh rating primarily. These “transistor” 9 volt batteries are made up of 6 button size cell batteries that have a limited amperage storage capacity because they are smaller in size as compared to a long single cell size battery like a double AA battery that range in the 2300mAmp range which is 10 times the amperage and volume of a little button cell in the 9 volt battery. Incidentally, it is the amperage that gives you longevity- not the voltage. Rechargeable batteries have a much more difficult challenge than Alkaline or Lithium batteries, because they are constructed differently. They consist of more metal/chemical composition with the specific purpose to take on a heat/ energy intake while trying to store the energy. As opposed to a non-rechargeable- they have more room and make-up to store more energy from the start. When a rechargeable battery begins their discharge cycle- they hit a peak level and sharply drop off in amperage much quicker than non-rechargeable, that is why Andy noted the cut out in that show- they aren’t forgiving or capable of giving you enough time to notice the drop-off, like you get from the Alkaline or lithium batteries. And Andy is right, consequently rechargeable batteries therefore cannot sustain “loads” very well. Andy is a smart guy- and taller in person- hey Andy- my 20 mo old son loves your work! (I need to get with you soon for some advice) Alkaline batteries have a drop off curve that is twice the width of a rechargeable battery. The Lithium is twice over smoother curve than the alkaline battery, (but is more expensive- as a result) On top of that- Alkaline batteries are going to give you about 650 mAh, Lithium batteries go as high as 1200 on the average- which is 3 & 5 times longer life respectively than a rechargeable battery. As far as wireless microphones go—they generally run on FM frequencies- and as such use a voltage regulator down to 5-6 volts to run the module, the Mic element, and the encoder. It just so happens that 9 volt batteries amperage consumption eventually cut off at about 4.8 to 5.4 volts, and at that point- your wireless microphone transmitter will start to give you trouble as the voltage regulator wavers. As opposed to rechargeable batteries that cut off at 10-15% of their capacity or about 7 volts, and that is another contributing factor for why they seem less forgiving and give you less warning. Furthermore, the reason you are given a 9 volt battery for the wireless microphone is not because you need “9” volts necessarily- but rather the size and availability of the battery cell Vs amperage-- that would fit in the small transmitter. Lou-if your transmitter is consuming 270 mA to run- then you only have about 40 minutes of power available on the average for that rechargeable battery. My guess is that it is using around 80-95 mAh on the average for an FM wireless microphone transmitter. If you are only getting an hour out of your battery- then I would suggest that you are using an improperly matched charger for the battery in the first place. You should be able to get about 3 shows out of a charge. And as rechargeable batteries go- they are not a good forgiving battery with enough warning to be considered the choice for wireless microphones. Here is a very good battery as rechargeable go: always buy 2 at once http://www.thomas-distributing.com/ap-200-1.htm But you need a special engineered smart charger to ensure that you will not overheat or otherwise damage the battery – with reverse polarity, and chemistry chipset type sensors: http://www.thomas-distributing.com/ap-accupower20.htm Don’t forget that a wireless MIC that is in mute is still consuming battery power- it is just muted. There- I hope that helps Lou- I would still give you product support in several areas to help you along, you already have my number if you need any more input. Cheers, Kelly Duro
No longer taking Private messages , thank you.
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Lou Hilario Inner circle 2235 Posts |
Thanks Kelly for the very detailed explanation. I will go back to alkalines for my wireless headset. BTW, I have no problems using my 8.4V rechargeable batteries on your VSM. It lasts for several hours.
Magic, Illusions, Juggling, Puppet & Parrot Show ^0^
http://www.louhilario.net |
Majiloon Regular user 135 Posts |
Okay Lou,
If you are using the double 9 volt connector I gave you, then remember to always match fully charged ones together- and do not attempt to slip one charged one and one that is not fully charge. This goes for any battery set-up whether they are rechargeable or not. Cheers, Kelly Duro
No longer taking Private messages , thank you.
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Dan McLean Jr aka, Magic Roadie Special user Toronto, Canada 804 Posts |
Yeah, the way Kelly describes the behaviour of different battery types sounds right to me. I had no recollection of the specific data, but I did know about the die-off curves: No doubt about the fact that alkaline is king.
"Why over-spend?" If I used the batteries for a very short time, and if I could always be sure about which batteries were charged and which were not, I would likely go with rechargeable NiMh. Such is the case with my digital camera, and such is the case with some of my customers' RF systems, so I've recommended rechargeable NiMh to some of them, and they've done very well. Better safe than sorry! If, however, I needed to get more than a couple of hours out of a battery, or if I wasn't personally certain of the last time a battery was charged, then I'd go with alkalines.
Dan McLean Jr
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Andy Leviss Inner circle NYC 1179 Posts |
BTW, I highly recommend Energizer brand over Duracell any day, and especially Energizer Industrial over Duracell's commercial line, ProCell. ProCells used to be the industry standard in sound reinforcement, but when Gillette bought Duracell, quality went down the tubes. I've heard both that general QC weakened and that they actually reformulated the batteries, although I can't confirm either. I can confirm that I have seen many, many ProCells that are low or even dead fresh out of the box; I can count the number of bad Energizer Industrials I've gotten out of thousands used on one hand (for an example, on my last tour, in a typical month (28 days at 8 shows a week for 32 shows a month) we used 1,792 AAA batteries, 192 AA batteries, and 1 9V battery, all Energizer Industrials. I can distinctly remember coming across a bad battery twice in six months).
--A, whose butt is on the line every time he puts a battery in a wireless mic
Note: I have PMs turned off; if you want to reach me, please e-mail [email]Andy.MagicCafe@DucksEcho.com[/email]!
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