Set your multimeter to the DC voltage mode. b. Connect the red probe to the positive (+) terminal of the battery and the black probe to the negative (-) terminal. c. Read the voltage displayed on the multimeter screen. A fully charged 9V battery should read around 9 volts or slightly higher. 4. Making your own conector: Find a dead 9 volt battery. Tear its head off - aka, remove the terminals. This will push onto another battery and provide you with terminals. Note that on the connector which you are making the terminals are reversed. On the connector the round pole is negative (unlike on the battery).

7. Leave the battery on the connector until it’s charged. The length of time it will take to charge your battery will depend on the size of the battery you’re using, the wattage of the solar panel, and even the weather that day. That’s where your digital display will come in handy.

Simon. system January 4, 2011, 8:31am 2. No it won't. You actually need a little more than 9V to charge a 9V battery. You also need to look at both the voltage AND the current the solar cell delivers. If your project uses 200mA and the solar cell only delivers 45mA, it can never keep your battery charged. The best battery chargers you can buy in 2024. 1. Duracell 45 Minutes Hi-Speed Charger: Best all-round charger. Price when reviewed: £38 | Check price at Amazon Duracell’s high-speed charger Now we need to test it. First, plug in the 9v battery in the battery clip, the little LED should light up. If everything work, its time to check to voltage. Use you multi meter, - to - and + to +. If it display 5v, it is right! So thats it! Your own portabe 5v power supply. You can even use it to charger your phone or anything else that use USB. vFs80l.
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    • how to charge 9v battery