The nominal voltage of Li-ion batteries is 3.6V or 3.7V. NiMH and Lithium are the two most common types of rechargeable nine-volt batteries. Lithium batteries have double the capacity of NiMH batteries. The 9V NiMH battery lasts around four hours, whereas the rechargeable Lithium battery lasts 7 to 7.5 hours. Place your 9-volt battery in such a way that the big negative terminal is on the spring, while the smaller positive terminal is on the car charger. Hold it in place for a few minutes, and voila! Your iPhone or Android is charged. You want to make sure that everything is well-connected – the spring should be touching the car charger’s nub Friends is Video Maine 9 Volt Battery Par Experiment kar ke Dikhaya hai, Really Friends Aap 100% 9V Battery Ko Charge kar Sakte ho, Mujhe Umeed HAI Doston A If memory serves, a typical 9V battery is rated for 900mAh, so drawing 0.34A would only give about 2 hours of good run time. Status Not open for further replies. The markings on it indicate that it will accept the typical 5V that nearly every USB port provides, or it will accept 9V for "fast charge". I was under the impression that USB standards allowed for no more than 5V. My research shows that USB Power Delivery has several profiles (up to 20V), and Revision 2.0 Version 1.2 includes a 9V profile. Unplug the power supply, snip the plug end off (unless you are going to use it!), divide the wires and strip them at the tip. Plug in the power supply and check the voltage using your volt meter making sure to note which way gives you +4.5 or -4.5 volts (like in the previous steps example). FKwVNkW. If your adapter is 12V and capable to deliver 100 mA then you need to select a current limitting resistor. Your battery is 9V so you have 12-9=3V over. 3V / 0.1A = 30 Ohm. So a 27 Ohm will do. 3V x 0.1A = 0.3W so take a 0.5 or 1W resistor. Now you can charge it for 10 hours. The cheapest way to charge a nickel metal hydride battery is to charge at C/10 or below (10% of the rated capacity per hour). So a 100 mAH battery would be charged at 10 mA for 15 hours. This method does not require an end-of-charge sensor and ensures a full charge. 9V battery Amp-Hours at 100 mA Discharge rate: 9V battery mAHs at 500 mA Discharge Rate: Amp-Hours at 1000 mA Discharge Rate: 9 Volt Alkaline: Duracell Coppertop: DC: 0.1 Volt: 310 mAH: 170 mAH: 90 mAH: 9 Volt Alkaline: Duracell Procell: DP: 0.1 Volt: 310 mAH: 170 mAH: 90 mAH: 9 Volt Alkaline: Energizer Industrial: EI: 0.1 Volt: 450 mAH: 330 By default white led require 3 to 3.3V to run properly. So if you line of 3 if them in series you can power them with a 9 volt battery without resistors. How many you can run in total depends on the amps a single led can process. If you have a regular 5mm led, it is probably using 20 to 30 mA per 3V. This stays the same when in series (just the

how to charge 9v battery