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Re: Dump Backup Battery
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Originally Posted by BrianBSL
Huh? What is preventing you from doing it with an IC based buck/boost converter? Small surface mount IC plus an inductor and a few resistors is all I could see that would be necessary.
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Originally Posted by Billbo911
The only way to do this and still get 7.2v out of it even when the main battery drops below 7.2v would require a circuit with weight and size that exceeds that of the backup battery it's self.
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Again, the only advantage I could imagine would be gained by elliminating it would be a reduction of size and/or weight. I don't think it is possible to achieve both requirements based on what you are describing. (I don't mind being prooved wrong, it wouldn't be the first time.) The trick would be to have it supply enought power to keep alive all the devices that may be drawing from it when the input voltage drops to say 5vdc.
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Originally Posted by BrianBSL
Not that I would say its worth doing it, stick with the backup battery. If you are really worried about size/weight, there are plenty of suppliers of smaller premade 7.2V battery packs.
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Now your talking. Just make certain it has the capacity to power all the devices that run off the battery.
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