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Author Topic: Best 9v rechargeable setup?  (Read 12571 times)

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Offline MakersMarc

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Best 9v rechargeable setup?
« on: October 20, 2015, 09:55:00 AM »
For an nbox?
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Offline tim in jersey

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Re: Best 9v rechargeable setup?
« Reply #1 on: October 20, 2015, 10:06:27 AM »
These were suggested to me by a longtime nbox owner/user. Has worked great thus far...

http://www.bhphotovideo.com/bnh/controller/home?O=&sku=883815&gclid=CKyss97W-cQCFe1j7AodiwsAag&Q=&is=REG&A=details

Offline MakersMarc

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Re: Best 9v rechargeable setup?
« Reply #2 on: October 20, 2015, 11:20:26 AM »
Thanks Tim
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Offline hi and lo

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Re: Best 9v rechargeable setup?
« Reply #3 on: October 20, 2015, 12:31:16 PM »
The NiMH Imedion 9v's are excellent rechargeable batteries. Just make sure you get the 9.6v version for use with the nbox.

However, you need to be careful not to over-discharge them. The original nbox / reutelhuber uses a high current design, ~50 mA draw each from the two batteries powering the opamps, and does not have a low-voltage cutoff mechanism. As a result, it will easily discharge these batteries to < 1 v total, which is terrible for their longevity. Each 9.6v battery is comprised of 8 1.2v cells in series, so dropping the total voltage to < 1v is effectively lowering the voltage to ~.1 v per cell. Generally speaking, it is not a good practice to discharge a NiMH cell below .9v, so draining it down to .1v is about as bad as it gets.

I have 16 of these... The original 8 I bought 3-4 years ago have served me well, however I am now starting to see failures from over draining them. Some of the batteries now show physical changes (bulges, indents, etc.), but still seem to take a charge ok. Others are now completely dead and will not accept a charge.

If you're using the nbox platinum, the risk of over discharge is basically non-existent, unless you left them in the unit while turned on for several days / weeks. I doubt that they have added a low-voltage cutoff circuit. In comparison, the original nbox will discharge them to < 1v total in ~6 hours.
« Last Edit: October 20, 2015, 12:40:49 PM by hi and lo »

Offline Gutbucket

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Re: Best 9v rechargeable setup?
« Reply #4 on: October 20, 2015, 01:09:44 PM »
The Maha Imedion 9.6V is a Low-Self-Discharge version of the standard Maha 9.6V.  I feel LSD NiMH are advantageous and strongly prefer them, even though they have a bit less total capacity than the standard version.  I'm not an nbox user however and have no idea of the specifics of that application, but am just posting to note that you will need to use the correct 9.6V charger for them.  A charger designed for nominal 9V NiMH batteries (which actually measure a bit less than 9V) will not charge them properly.  The simple 4-bay Maha chargers for their 9.6Vs have worked well IME and can be powered by  either an 120VAC or 12VDC source.
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Offline MakersMarc

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Re: Best 9v rechargeable setup?
« Reply #5 on: October 20, 2015, 01:53:27 PM »
Thanks a ton for all the info guys,
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Offline robeti

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Offline Gutbucket

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Re: Best 9v rechargeable setup?
« Reply #7 on: October 20, 2015, 02:52:53 PM »
^^^
That Amazon link is to the Powerex non-LSD version of the 9.6V (white case with yellow lettering).
The Imedion LSD version of the 9.6V has a black case with grey lettering. 



Both are manufactured by Maha.

Here's the specifics on the Imedion version at Thompson Distributing- http://www.thomasdistributing.com/Maha-Imedion-9V-96V-230-mAh-Low-Discharge-NIMH-Rechargeable-Battery_p_2455.html

Here's their package of charger + 3 Imedions, otherwise same as the Amazon deal- http://www.thomasdistributing.com/MAHA-MH-C490F-9-Volt-9V-Battery-Charger-with-Three-Maha-Imedion-96V-230-mAh-Batteries-with-World-Adapter-and-12V-Cord_p_851.html
« Last Edit: October 20, 2015, 03:03:11 PM by Gutbucket »
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Offline tim in jersey

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Re: Best 9v rechargeable setup?
« Reply #8 on: October 21, 2015, 02:18:22 AM »
The NiMH Imedion 9v's are excellent rechargeable batteries. Just make sure you get the 9.6v version for use with the nbox.

However, you need to be careful not to over-discharge them. The original nbox / reutelhuber uses a high current design, ~50 mA draw each from the two batteries powering the opamps, and does not have a low-voltage cutoff mechanism. As a result, it will easily discharge these batteries to < 1 v total, which is terrible for their longevity. Each 9.6v battery is comprised of 8 1.2v cells in series, so dropping the total voltage to < 1v is effectively lowering the voltage to ~.1 v per cell. Generally speaking, it is not a good practice to discharge a NiMH cell below .9v, so draining it down to .1v is about as bad as it gets.

I have 16 of these... The original 8 I bought 3-4 years ago have served me well, however I am now starting to see failures from over draining them. Some of the batteries now show physical changes (bulges, indents, etc.), but still seem to take a charge ok. Others are now completely dead and will not accept a charge.

If you're using the nbox platinum, the risk of over discharge is basically non-existent, unless you left them in the unit while turned on for several days / weeks. I doubt that they have added a low-voltage cutoff circuit. In comparison, the original nbox will discharge them to < 1v total in ~6 hours.

^ This is why I love ts.com. Ask a simple question and you get a detailed, technical answer, broken down in to laymans terms, which helps me further my understanding of electronics in general as well as the specific gear I'm running. Love this board. :)

Offline tim in jersey

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Re: Best 9v rechargeable setup?
« Reply #9 on: October 21, 2015, 02:31:39 AM »
Also I'm going to upgrade from the N-box to the N-box platinum by next year so I don't have to count/do math in the field during festival season. 1 set of batteries per day without worry sounds like a dream...

Not having to change batteries in the rain for an entire fest set sounds like a dream come true...

Offline robeti

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Re: Best 9v rechargeable setup?
« Reply #10 on: October 22, 2015, 02:20:34 PM »
^^^
That Amazon link is to the Powerex non-LSD version of the 9.6V (white case with yellow lettering).
The Imedion LSD version of the 9.6V has a black case with grey lettering. 



Both are manufactured by Maha.

Here's the specifics on the Imedion version at Thompson Distributing- http://www.thomasdistributing.com/Maha-Imedion-9V-96V-230-mAh-Low-Discharge-NIMH-Rechargeable-Battery_p_2455.html

Here's their package of charger + 3 Imedions, otherwise same as the Amazon deal- http://www.thomasdistributing.com/MAHA-MH-C490F-9-Volt-9V-Battery-Charger-with-Three-Maha-Imedion-96V-230-mAh-Batteries-with-World-Adapter-and-12V-Cord_p_851.html

Thanks! I wasn't aware of that! I have both the white/yellow + black batteries. Never had a problem with any of them.
mics : nakamichi cm-300's (JB mod, cp1, cp2) , sp-cmc-4u (at-u853,4.7k mod) (c,h)
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video: Panasonic hdc-sd600, Sony hx9v

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Nakamichi cp-2 caps http://taperssection.com/index.php?topic=184476.0
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Re: Best 9v rechargeable setup?
« Reply #11 on: October 29, 2015, 08:45:04 AM »
Does anyone use rechargeable 9v's in a lemosax?


Offline hi and lo

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Re: Best 9v rechargeable setup?
« Reply #12 on: October 29, 2015, 03:49:57 PM »
Does anyone use rechargeable 9v's in a lemosax?

Yes, works fine.

Offline Craig T

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Re: Best 9v rechargeable setup?
« Reply #13 on: October 29, 2015, 04:41:15 PM »
Also I'm going to upgrade from the N-box to the N-box platinum by next year so I don't have to count/do math in the field during festival season. 1 set of batteries per day without worry sounds like a dream...

Not having to change batteries in the rain for an entire fest set sounds like a dream come true...

Yes.  The plat. version makes it a breeze to record festivals.  Nbox-P > M10... set it and forget it all day.
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Re: Best 9v rechargeable setup?
« Reply #14 on: October 31, 2015, 01:17:25 PM »
Thanks for the gold guys, most appreciated.
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