0. Aug 25, 2003. #2. Hi there, For an art project I need to build a small 1,5V power supply to power a. small MP3 player. (replace a 1,5V AA battery) Available is 8-10V DC. I know a little bit about electronics, enough to build a simple schematic. However, I can't find a schematic to do this; maybe anyone of you knows how.
Step 4: Add the "contacks" to the Connector. If you have a device where there may not be a series connection between the batteries then you'll need to cut each piece of dowel to the length of an AA battery minus the height of the thumbtack caps. My thumbtack caps are about 1.5mm. 5. Your 1.2V rechargeable battery should work perfectly well. An alkaline battery starts of with a terminal voltage somewhere between 1.5 - 1.6 Vdc which decays as the battery is discharged. End of life is a terminal voltage somewhere between 0.7 - 1.0 Vdc (depends on the equipment using the battery). Your 1.2V rechargeable cell starts off with single 24-volt charger is connected to a 24-volt battery pack. In Figure 9 we see a pair of 12-volt batteries connected in parallel. This 12-volt battery pack is connected to a single 12-volt charger. Note the blue wire designated W1. The purpose of this wire is to balance the voltage drop evenly across both batteries and each wire during charging.
Using a 5v source (USB) to charge a 3.7v battery inside and then using either buck or boost converter to produce the 1.5V/9V up to a specified current. The output voltage is constant (zero Output resistance) throughout the discharge cycle but suddenly switches off at the end of discharge.
The proper voltage for AA/AAA NiCd/NiMh rechargeable battery is 1.25 Volts. To test the battery, turn on your voltmeter, put the voltmeter on DCV and make sure that it is far above the battery voltage, on most voltmeters there is a setting "20" in the DCV area, so switch your voltmeter to that setting. With the battery in front of you, put the

If your battery is not charging and the charger is rapid flashing and the battery is warm, it may be too hot- particularly after heavy or continued use. If so, please allow the battery to cool, then reinsert the battery on charger to try charging again. If this still does not work, please call Black & Decker Customer Service at 800-544-6986

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    • how to charge 1.5 volt battery