It depends on whether the voltage of the solar panel you choose can charge a 3.7V lithium battery. Generally, the solar panel used with a 3.7V lithium battery is about 5.5V , because different batteries have the charging voltage of solar panels. equipped with different voltages is different. That is, if the voltage of the solar panel you choose is lower than 5V, you cannot hide the lithium battery charge.
How to connect a cell phone charger to the solar panel on a shared bike?
There is not just one solution, but look at this one:
1. Solar panel charging
Mobile phones generally use 3.7V lithium batteries. In this case, you can choose a solar battery of about 4.5V to charge your mobile phone.
Nowadays, solar cells can be made flexible, just like a piece of paperr which can be folded. The advantage is that they can be sewn into textiles, such as backpacks, hats, clothing, etc. , so they can be used for outdoor viewing. You can charge your cell phone while enjoying the beautiful scenery of the motherland. If your mobile phone capacity is 900mah, A4 paper size (8.5W) single crystal silicon battery board can be fully used. charged in one hour under sufficient sunlight.
2. Cell Phone Power Bank
I recommend this method to charge your cell phone when there is no sun. Look at the image below. Although this kind of thing only costs tens of euros. dollars, but there are very few restrictions on usage. As long as you have AA dry batteries, you can charge your cell phone at any time. However, in the interest of protecting the environmentent, I recommend using rechargeable nickel metal hydride batteries, which it is. very beneficial for environmental protection.
Finally, I hope you can enjoy OPPO's powerful music functions without running out of power.
Can a 4.4V solar panel charge a cell phone battery?
1. Solar panel + circuit + lithium battery + case, it works
2. Find a 5.5-6V solar panel and connect an IN5819 diode in series in the forward direction to directly charge the phone. The charging current depends on the output current of the solar panel you choose.
3. The specifications of the solar panel are 6V, 0.33A. Looking at the voltage, it is actually 18 small cells connected in series, each cell is 0.5V, so the open circuit voltage is of 9 V. Actual charging depends on the intensity range of sunlight. The voltage is 6.3 to 6.9V, just enough to charge the 6V battery, no charger needed.
4. It is cut from a large battery sheet of 15.6*15.6 square centimeters, because the size of the large battery sheet is about 3.5W, 6.6A is calculated in slices of 0.33 A, and each small battery sheet is about 12 square centimeters.
5. Check the junction box behind the solar panel to see if there are rectifier diodes connected in series to the positive and negative wires inside. This prevents reverse charging. If not, add one.
1. Make sure the cell phone battery voltage is lower than the working voltage of the solar panel so that it can be charged. For 4.4V solar panels, cell phone battery voltage is best around 3.6V.
2. The operating current of the solar panel must be sufficiently large,usually 1/5 of the cell phone battery capacity. For example, if the cell phone battery is 2000mA, the operating current is better 400mA. , so that it can be fully charged in one day.
3. The solar cell itself is black and absorbs heat, but that doesn't mean it's charging.