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Author Topic: Rechargable battery for 9v motor  (Read 487 times)
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I plan on using batteries for my arduino and some 9v motors. mAh isn't particularly a concern, I just want the best value. I've looked at sparkfuns batteries and chargers and they seem to be low voltage and expensive when you get the charging circuit. I'm not totally against using nicad, should I just get some rechargeable AA batteries or is there a better way that has a similar cost? Would it be possible for me to make my own charging circuit for nicad AAs so I can keep them in my device and do I need any external hardware to monitor battery charge? Can I use 6 AAs to power the 9v motor unregulated or is that a bad idea?

Any tips on the issue are appreciated, this is a new subject to me. Thanks.

edit: maybe I'm thinking of NiMH, are those simple to chage like NiCad?
edit2: each motor looks like it could draw up to .8A each stalled and I will be using two. They are only rated up to .3A each though, i don't plan on exceeding that.
« Last Edit: August 12, 2012, 11:49:46 pm by stoopkid » Logged

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Note, rechargeable AA batteries are 1.2 volts instead of 1.5 volts.  So you would need 8 AA batteries to get 9.6 volts total.

You can get rechargeable 9v batteries that are in the form factor of the 9v battery used in smoke alarms fairly cheaply, but the capacity of these isn't that high.

I've thought about the 5/9/12v lipo batteries you can get for ~ $40 (from Chinese suppliers) or $55 (from US suppliers).  These charge with micro USB cables, and provide separate terminals for 5v, 9v, and 12v, so you could plug the Arduino into the 5v, and the motor into the 9v ports.  Here is the current cheapest battery on ebay: http://www.ebay.com/itm/5V-9V-12V-USB-Super-Capacity-Recharge-Li-ion-Battery-/320871845874?pt=US_Rechargeable_Batteries&hash=item4ab573cff2.
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That's pretty neat, I might give that a try. I'm just worried about the reliability of an nobrand chinese battery of such apparent complexity.

edit: it also appears to be pretty big. Again, I have no real requirements but I wonder if there are low capacity ones that are smaller.
« Last Edit: August 13, 2012, 12:54:50 am by stoopkid » Logged

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That's pretty neat, I might give that a try. I'm just worried about the reliability of an nobrand chinese battery of such apparent complexity.

edit: it also appears to be pretty big. Again, I have no real requirements but I wonder if there are low capacity ones that are smaller.
I'm sure there are probably branded versions.  For my potential app, I need 12+ hours of continuous runtime (preferably 2+ days), and using only one charger port was desirable, since I generally need to charge camera batteries as well, and hotels don't always have that many outlets.

However, if you don't need that much capacity, as I said you can pick up 9v batteries fairly cheaply.  Note this battery only has a capacity of 175maH, while the battery I quoted had 8500maH at 9v: http://www.amazon.com/Energizer-Eveready-00916-NH22NBP-Rechargeable-Battery/dp/B000ES8A8M/ref=sr_1_1?s=electronics&ie=UTF8&qid=1344859289&sr=1-1&keywords=energizer+9v+rechargeable.

Bear in mind that most batteries these days are made in China, though I imagine as the Chinese implement environmental and worker safety laws, that the location for manufacturing will change to the next lowest bidder.
« Last Edit: August 13, 2012, 07:09:44 am by MichaelMeissner » Logged

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If you are worried about the quality, you could try HobbyKing. They have a very good reputation in the RC-world.

http://www.hobbyking.com/hobbyking/store/__235__85__LiPo_LiFe_NiMH_Battery-ZIPPY_Lipoly.html

But ofcource if you decide to go with LiPo battery's you will need a special LiPo charger/balancer
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