NO you cannot charge your 12V AGM battery directly with a 19V Laptop power supply. You need a battery charger. The laptop power supply IS NOT a battery charger, it is a fixed voltage SMPS power supply.
Can I use a 19V charger for a 20v laptop?
Yes: technically it can be used, but you need a higher amount of power (watt). if the adapter is 19V 6A, it might start the PC but you will have strange side effects.
Can I use a 19V charger on a 18.5 V laptop?
Yes you can use the 90W adapter without any problems on the computer since the difference in Voltage is minimal and in the accepted range.
What happens if you use a 65w charger for a 45w laptop?
As long as it is the same voltage and connector type you can use a higher watt adapter. It will charge the battery a bit faster but other than and the size of the brick you will see no difference. The laptop will only draw the current it needs while running.
Can I use 12V instead of 19V?
Portable computer Can an ac 12V adapter replace an ac 19V adapter? No No No No No No To expand the response in Taes, no, no, no. If you do not use the appropriate voltage adapter and amplifier the battery will not be charged, and the laptop will be very unstable, if it works at all.
Can I use a 19V charger on a 15V laptop?
You can not however use a 15V charger on a laptop that requires 19V or vice versa. The output tip needs to match. However, to avoid any damage to your laptop it’s usually a good idea to check the polarity against that of the laptop or your original charger.
Will a 19v charger work on a 19.5 V laptop?
It’ll be fine. Laptops have internal high-precision voltage regulators which convert down from the very roughly-regulated voltage supplied by the charger to the exact voltages they need for different things so half a volt won’t make any difference.
Can I use 18V adapter for 19v?
Yes should be ok just,as you should try and keep to less than 5% difference if possible. Make sure the power output is equal to or greater than the 18V one.
Can I use 90w charger instead of 65W HP?
Yes, you can use a 90 watt ac adapter, a.k.a power charger, for your 65 watt-compatible laptop. It will actually charge your battery faster.
How do I know what charger My HP laptop needs?
Look on the bottom of the laptop sometimes under the battery for the Volts and Amps. Look on the AC adaptors for the Volts and Amps. Just match them.
What happens if I use a 12V adapter on a 19V device?
Using low current adapter drastically degrades charging speed and increase battery health. While using high current adapter charging would be faster till 85% and goes to normal after that, but this will shorten battery life aka degrades battery health. So it’s a better idea to keep the current unchanged.
