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Running Mini-Itx from battery

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Hi,


I am currently building a robot which has onboard Mini-Itx motherboard. Apart from this it has two 12v motors which draw about 500 ma each. I am powering this bot using a 12v 7.5 AH battery.Everything seems to be running fine except that sometimes when the load increases the motor draw excess current which ultimately results in voltage drop.Because of this my motherboard shuts down as it requires correct 12 volts to function. What could be the solution. I don't want to use two batteries.
 
Well. u have some MIPS on board , not so? Let the mobo throttle down the load if it sees a drop in Vdd.
 
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