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I have : HydriMax 4.8V 3600mAh NiMH Flat Rx U I want to use it like a USB power supply to charge cell phones and another stuff. How to make it ? Do i need some electronics, or just wires ? Thank you.
And got the following answer:
The problem with the battery is that the voltage will drop when it is loaded; depending on how much current the device that you are hooking up to it. Just because you have 3.6 Ah doesn't mean that the battery can supply 3.6 amps continously for one hour. In addition, the voltage is not exactly 4.8V either. This will range to how much the load current is. For light loads, i would not be surprise if the voltage is over 5 volts. It is best to use the restrication that most USB ports for PCs already have: the 500mA limit. Usually most devices will restrict the current flow to 500mA or 0.5A to avoid the PC USB port going over-current. To be sure, measure the current with a DMM with the DMM in series with the line. If it does follow the 0.5A limit, then you should have about 3.6Ah / 0.5A = 7.2 hours of battery usage, but expect this to vary as well as the voltage to drop as the battery becomes depleted. BTW, To guarantee that the voltage does not go over 5.25 volts (5V + 5%), add in a 5.3 V zener diode as a protection device when checking the current draw. If it does go over, consider a low drop-out (LDO) voltage regulator (linear or switcher) as a standard part of the design.