They don't sell any 5V adapters so I would need to purchase a multi-voltage adapter for $20 to get exactly 5V. Anyways should the 4.5V adapter work OK? More options I am using adapter 15 V – 0.5 Am- 7.5 W Instead of the original adapter 15 V- 0.36 Am-5.4W For my shaving Mashien Is ther any damage can happen to my shaver Veronica Thanks for answering. @KyokoSasagava As long as the voltage is not more than 10% off and the power-supply can supply the same amount (or more) of current (Amps) this is in general fine. Do take care of the polarity of the plug. The + and - HAVE TO BE on the same side of the plug as on the original power-supply. \$\begingroup\$ I made an LM317 regulator circuit to provide 4.2 V, however 1. it is a waste of energy 2. it needs a heatsink and can be quite bulky 3. I started to wonder - if the device turns on fine using the 5V provided on the charging port, and it is actually specified to 4.2V, then it might be able to run from 5V as well. A 5V SPDT relay is an electrical switch used to control higher-voltage circuits with lower voltage signals. It allows a low-voltage signal, such as the one provided by a microcontroller or other low-power circuit, to control larger loads like motors, lights, and appliances that require more power. . That said, I'd suggest against using a 5 volt supply for a 12 volt device. For a start, if it really requires 2 volts (or close to it), you will have a problem because 12 x 2 = 24 watts, while 5 x 2 = 10 watts, so the power supply is under-specced to do the job at maximum load. Although this could work, it could be damaging componentry. A typical tolerance on the capacitance of a motor run capacitor for HVAC applications is +/-6%. With this being said, that means that a 40 µF capacitor can rate from 37.6 to 42.4 µF and still be considered a passing capacitor. When engineers design motors, they take into consideration this type of tolerance range. Most protection circuits cut off if voltage greater than 4.3 V or temperature greater than 90 °C is reached. Below 2.50 V/cell the battery protection circuit may render the battery unchargeable with regular charging equipment. Most battery circuits stop at 2.7–3.0 V/cell. So to achieve a full state of charge you'd normally want to aim at 4.2V. Now, most people are confused that they can use the 5Ah battery instead of 4Ah. So scroll down to know whether you can use the 5Ah battery instead of 4Ah. Yes, it can be used and how the exchange would look like. If you are using a 4Ah battery and heading towards the 5Ah would mean that your application could run up to 25% longer. As a real example, I have a power bank with Micro-USB input: DC 5V 2A and USB-C-Input (PD): DC 5V 3A, 9V 2A, 12V 2A, 14.5V 2A. I think I charged it with micro-USB from a DVB USB port used for connecting external HDDs, for recording, etc. After this, the power bank can be charged but it can not charge other devices.

can i use 4.5 v instead of 5v