Gear / Technical Help > Remote Power
Best 9v rechargeable setup?
MakersMarc:
For an nbox?
tim in jersey:
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
MakersMarc:
Thanks Tim
hi and lo:
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.
Gutbucket:
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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