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  #1  
Old 01-26-2021, 12:05 AM
douglasfan1 douglasfan1 is offline
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Default USB 9V rechargeable battery

I've just tried 4 USB 9V rechargeable batteries individually for acoustic preamp (Highlander IP-2) and a blender preamp (L.R.Baggs Mixpro), both got the unwanted noise which disappear when I use normal 9V battery.

Is that the normal result when using rechargeable 9V battery in audio gear?
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  #2  
Old 01-26-2021, 12:28 AM
AeroUSA AeroUSA is offline
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Quote:
Originally Posted by douglasfan1 View Post
I've just tried 4 USB 9V rechargeable batteries individually for acoustic preamp (Highlander IP-2) and a blender preamp (L.R.Baggs Mixpro), both got the unwanted noise which disappear when I use normal 9V battery.

Is that the normal result when using rechargeable 9V battery in audio gear?
Yes I would avoid them.
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Old 01-26-2021, 12:41 AM
Cuki79 Cuki79 is online now
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Quote:
Originally Posted by douglasfan1 View Post
I've just tried 4 USB 9V rechargeable batteries individually for acoustic preamp (Highlander IP-2) and a blender preamp (L.R.Baggs Mixpro), both got the unwanted noise which disappear when I use normal 9V battery.

Is that the normal result when using rechargeable 9V battery in audio gear?
Those use a DC-DC voltage converter than can be noisy if not properly filtered.

my 2 cents,
CUki
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Old 01-26-2021, 01:33 AM
lkingston lkingston is offline
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NiMH 9v rechargeables come in three voltages: 7.2, 8.4, and 9.6. Often an 8.4 or 9.6 volt battery will work were the stock 7.2 volt one doesnít have enough voltage.
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Old 01-26-2021, 03:20 AM
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Originally Posted by lkingston View Post
NiMH 9v rechargeables come in three voltages: 7.2, 8.4, and 9.6. Often an 8.4 or 9.6 volt battery will work were the stock 7.2 volt one doesnít have enough voltage.
I think he was refering to something like that

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Old 01-26-2021, 06:25 AM
varmonter varmonter is offline
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Maybe one of the EE here could
explain how a battery could impart
noise. In layman's terms.
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  #7  
Old 01-26-2021, 06:52 AM
douglasfan1 douglasfan1 is offline
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Quote:
Originally Posted by Cuki79 View Post
I think he was refering to something like that

Exactly, is that work or all those batteries are not function properly in audio equipment?
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Old 01-26-2021, 08:30 AM
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Originally Posted by douglasfan1 View Post
Is that the normal result when using rechargeable 9V battery in audio gear?
Just to re-clarify - we're talking about USB rechargeables here, not just any r/c which, in my experience, are no different to single use. Is this correct?
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Old 01-26-2021, 10:30 AM
lkingston lkingston is offline
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Quote:
Originally Posted by shufflebeat View Post
Just to re-clarify - we're talking about USB rechargeables here, not just any r/c which, in my experience, are no different to single use. Is this correct?


I didnít know there were Lithium-ion rechargeable batteries with USB ports for recharging. It looks like a product I would use...unless it makes noise...

What is the actual output voltage of these batteries?

I know that I donít get any added noise with my NiMH batteries. I use the 9.6 variety in everything but Boss pedals (which donít work with the extra .6 volts). 8.4v NiMH batteries work fine in Boss pedals.

For anyone who might be curious, a standard 9v Alkaline battery is made up of 6 1.5v cells wired in series. NiMH cells are only 1.2v, so when 6 of them are wired in series (as in a standard 9v battery form factor) the output voltage is 7.2 volts (6 x 1.2v). 8.4 volt rechargeables cram an extra 1.2 cell into the same case bringing the output voltage up 1.2v which results in an 6.4 voltage. 9.6 volt rechargeables stick 8 1.2v cells in the same case, bringing the voltage up to 9.6 volts.

These are all initial voltages with a full charge. These voltages go down gradually as the battery depletes, making it easy to monitor their power with a built in battery meter.

A few years ago, I tried a couple of LiON batteries in some audio gear. What I liked was that they gave a full 9 volts and lasted a decent amount of time at that voltage.

What I didnít like is that the metering on the gear would say full right up until the point that they suddenly died. I was doing video work at the time, and I would go into a take having just looked at three bars of battery, only to have it die mid take. That is why I stopped using them. They worked well other than that.
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Old 01-26-2021, 11:35 AM
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I've used Talentcell Lion battery packs for cameras and field recorders and they've been noise free. If your gear has a jack for external power, I'd look for something like that. The ones I used were 12v and 12/5v models, but I see they have at least one 9v model. There may be other brands and sizes, of course. Just one datapoint...

https://www.amazon.com/dp/B01337QXMA...pa_dk_detail_2

P.S. I found the LED power (remaining) indicators good enough for field use, though I always had a backup and switch things out before "the lights went out." (My field recorders had voltage indicators, too.)
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Old 01-26-2021, 01:18 PM
phcorrigan phcorrigan is offline
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Quote:
Originally Posted by keith.rogers View Post
I've used Talentcell Lion battery packs for cameras and field recorders and they've been noise free.
I use a similar 12V battery for my ToneDexter. When I got my Gretsch electric and started building my pedalboard, I installed a 12v-9v converter on the bottom of the board so I could use the same battery (or a 12v power supply) for my pedals.

This is the converter: https://www.amazon.com/SMAKN%C2%AE-C...1688230&sr=8-1

With connectors, I spent less than $10 for the converter.
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Old 01-26-2021, 01:21 PM
phcorrigan phcorrigan is offline
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Quote:
Originally Posted by keith.rogers View Post
I've used Talentcell Lion battery packs for cameras and field recorders and they've been noise free. If your gear has a jack for external power, I'd look for something like that. The ones I used were 12v and 12/5v models, but I see they have at least one 9v model. There may be other brands and sizes, of course. Just one datapoint...

https://www.amazon.com/dp/B01337QXMA...pa_dk_detail_2

P.S. I found the LED power (remaining) indicators good enough for field use, though I always had a backup and switch things out before "the lights went out." (My field recorders had voltage indicators, too.)
Be careful if you buy this battery. The 9v connection is center-positive, and most guitar pedals require center-negative, so you'll need to build or buy a crossover cable.
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  #13  
Old 01-26-2021, 07:57 PM
douglasfan1 douglasfan1 is offline
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I think the easiest way is to use back the normal standard 9v battery then cause they last quite a long time actually. I just hate to un-attach the battery as the attachment thing looks like easy to be damaged. Anyway, thank you for all the response.
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  #14  
Old 01-26-2021, 08:59 PM
lkingston lkingston is offline
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Quote:
Originally Posted by douglasfan1 View Post
I think the easiest way is to use back the normal standard 9v battery then cause they last quite a long time actually. I just hate to un-attach the battery as the attachment thing looks like easy to be damaged. Anyway, thank you for all the response.
I think the issue must be in the USB recharging circuit. Regular rechargables would probably work fine if they had a separate charger instead of the USB port.
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Old 01-27-2021, 10:54 AM
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My understanding from other Li-ion applications is that they all have an internal circuit to monitor and prevent overcharging, as where ni-cad andvothers do not. Perhaps this generates noise in susceptible situations. Maybe simply some shielding foil in the battery compartment would fix it?
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