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#1
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Battery Power
Hi,
I've had a good search for a Video Link that uses batteries, but couldn't find any, so I bought one that uses plug-in adapters, but would like to hook up batteries to make them portable. The devices have the following power specs: 12V DC, 200 mA 9v DC, 400mah I would like to use rechargeable batteries to power these devices for no more than an hour. I thought for the 12v device I could use a 12v sealed lead acid battery. For the 9v device, would rechargeable NiMH batteries do the job without a problem? As there are no 9v sealed lead acid batteries that I can see, this seems the only alternative Hope someone can give me confirmation that this is possible. Cheers Sean |
#2
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Find yourself a good 12V Lithium Ion cell phone battery. Most are 600mah or
bigger so you should get at least an hours time out of your video sender. Charging the battery will be your next hurdle. Pat Ziegler Wholesale Electronics Inc. www.weisd.com wrote in message ... Hi, I've had a good search for a Video Link that uses batteries, but couldn't find any, so I bought one that uses plug-in adapters, but would like to hook up batteries to make them portable. The devices have the following power specs: 12V DC, 200 mA 9v DC, 400mah I would like to use rechargeable batteries to power these devices for no more than an hour. I thought for the 12v device I could use a 12v sealed lead acid battery. For the 9v device, would rechargeable NiMH batteries do the job without a problem? As there are no 9v sealed lead acid batteries that I can see, this seems the only alternative Hope someone can give me confirmation that this is possible. Cheers Sean |
#3
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On Fri, 8 Jul 2005 11:02:03 -0500, "Pat Ziegler"
wrote: Find yourself a good 12V Lithium Ion cell phone battery. Most are 600mah or bigger so you should get at least an hours time out of your video sender. Charging the battery will be your next hurdle. Yes, a lithium battery is a good idea in terms of being light and compact, I'll have a look around. I have a 12v lead battery to power a small monitor which works great with a standard 12v charger, but it is rather bulky which is the only problem with it being portable. I think the 12v battery won't be a problem either way, its the 9v I'm looking for that is my main problem Cheers, Sean |
#4
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You could use a 12v battery with an adjustable voltage regulator a
LM317 3 pin regulator would work just fine. You only need 2 resistors to set the output voltage and it has a 1 amp capacity which would be more than enough for your needs. On Fri, 08 Jul 2005 17:53:05 GMT, wrote: On Fri, 8 Jul 2005 11:02:03 -0500, "Pat Ziegler" wrote: Find yourself a good 12V Lithium Ion cell phone battery. Most are 600mah or bigger so you should get at least an hours time out of your video sender. Charging the battery will be your next hurdle. Yes, a lithium battery is a good idea in terms of being light and compact, I'll have a look around. I have a 12v lead battery to power a small monitor which works great with a standard 12v charger, but it is rather bulky which is the only problem with it being portable. I think the 12v battery won't be a problem either way, its the 9v I'm looking for that is my main problem Cheers, Sean |
#6
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#7
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#8
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On Sat, 30 Jul 2005 13:09:57 +1200, Jasen Betts
wrote: In article , wrote: Hi, I've had a good search for a Video Link that uses batteries, but couldn't find any, so I bought one that uses plug-in adapters, but would like to hook up batteries to make them portable. The devices have the following power specs: 12V DC, 200 mA 9v DC, 400mah I would like to use rechargeable batteries to power these devices for no more than an hour. I thought for the 12v device I could use a 12v sealed lead acid battery. definately. one rated 200mAh would be sufficient. i don't know if they make them that small for the 9v,7 NiMh cells in series gets you 8.4v which should be sufficient, charging them could be challenging unl;ess you have a charger thant can do individual cells, or a custom made charger. many small "9V" looking rechargeables batteries are only 6 cells for 7.2v which may not be enough they also don't have the capacity and are over- priced for what the provide. --- Really? I'd appreciate it if you'd post which batteries you're talking about (manufacturer and part number) so that I can make sure that, when I buy rechargeable 9V NiMHs I stay away from them. --- you need 400mAh capacity to run it for an hour the so if 7.2V is enough one of the pre-packaged 7.2v batteries would do it. For the 9v device, would rechargeable NiMH batteries do the job without a problem? As there are no 9v sealed lead acid batteries that I can see, this seems the only alternative lead acid cells are 2v each so there's no way to make 9V in that material, another option is to use a 12V supply and a voltage regulator to step it down to 9v. this wastes electrical energy, but as lead acid cells are cheaper than NiMh, and easier to charge, it could save money. -- John Fields Professional Circuit Designer |
#9
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...for the 9v,7 NiMh cells in series gets you 8.4v
...many small "9V" looking rechargeables batteries are only 6 cells for 7.2v Jasen Betts Really? I'd appreciate it if you'd post which batteries you're talking about (manufacturer and part number) so that I can make sure that, when I buy rechargeable 9V NiMHs I stay away from them. John Fields When he said **rechargeables", he's right. http://64.233.167.104/search?q=cache...l-Voltage-7.2v When you specify **NiMH**, you eliminate the 7.2V stuff, but 8.4V is quite common--with 9.6V being in the minority. http://64.233.167.104/search?q=cache...2v+9.6 v+Size |
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