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Prolong Your Battery Life using MOSFETs in the Battery Backup Circuit
Battery backup and battery charging are two modes of battery backup circuits. The circuit below shown a simple 
battery backup circuit using low treshold MOSFET device in order to gain better efficiency in addition of very low voltage drop resulted by the MOSFETs that will prolong battery life, and meet battery voltage limitations.
You require the following component selection to design this Battery Backup Circuit : 1N4001 Diodes (D1-D5), standard 1/4 watt, 5% tolerance Resistors, dual comparator LM393N for U1, 5 Eveready nickel cadmium cells battery in series, and TN0604N3 low threshold N-channel DMOS transistors for their low on-resistance at low gate drive. You can modify this circuit with an added features such as battery backup mode indicator, low battery voltage early warning, or battery shutdown indicator with a microprocessor in more complex systems.
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