How to connect an external battery to a nuotbook?

Question

Electronics

Good afternoon.
I have an old (antique artifact) dell latitude cs 400x laptop (it seems so). I want to adapt it to auto diagnostics. Naturally, at the lowest cost. There is an old UPS, I tried to connect it to an auto-accumulator (in parallel with the standard UPS) and use the regular power supply of the laptop. It works, but the wire and the connector in the cigarette lighter are terribly hot (the spring inside has already burned out!).
The stock battery is long gone. In its compartment live a USB hub with a flash drive, bluetooth and Wi-Fi.
Is it possible to somehow connect an external 12v battery to this wheelbarrow? Maybe this rarity does not need a mandatory response from the controller? Who did that? Or how?
Thank you for your attention.

Answer 1

I bought a used dead battery purely for the sake of the controller, and instead of my own, I already hung a stabilizer on the wires (I highly recommend it, because the voltage in the on-board network can float) and in the cigarette lighter (by the way, the same laptop was purely for diagnostics).

Answer 2

If the laptop eats 50-100 watts, then this is the norm that the first connector that comes across is heated this way.
Standard auto sockets are so-so for high capacities, especially through a bunch of unnecessary conversions (12 to ~220 and up to 19).
Can it output power directly from the battery terminals (through fuses), then to a step-up PSU up to 19 V and to the charging connector?
The car plug is worth looking for a normal one.
Regarding the controller - ask someone to charge without a controller and check whether it is needed or not.
There are also ready-made solutions for charging laptops from the car network.

Answer 3

https://www.drive2.ru/c/2869176/
https://www.drive2.ru/c/2050289/
https://www.citilink.ru/catalog/mobile/note_aks/no...
https: //www.dns-shop.ru/product/7db62864b3bb3330/a...

Answer 4

battery charger for laptop with 12 volt input. all. I have a scheme that works.
remove the battery from the ups. They also charge the battery.
and do not use a soldering iron in the battery.

Answer 5

By the way, the necessary comment (thanks for reminding me!)
He has 20 volts at the input.
The connector on the laptop for the battery is 8 pins (of which one is a plastic key)
PS: pinout for many laptops https://doc.diytrade.com/docdvr/1687590/44875813/1...

Answer 6

The essence of the question, if you peel off all sorts of details, is to power the laptop from an external battery, such as a car. To do this, you do not need to fence the complex conversion of 12 volts first to 220, then to 20, and then inside the laptop to a bunch of other voltages, as described by the author of the question. Everything can be done in one step - you need to take not one car battery, but one and a half . For many models of such batteries, lead jumpers between the banks are available from the outside - you need to carefully drill and screw the lead from the connection of 3 and 4 cans with a self-tapping screw. Then connect one full and half of the other in series, and apply 18 volts thus obtained to the laptop instead of the standard PSU (the difference between 18 and 20 volts does not go beyond the tolerance, it is usually 10%).
This is simpler and much more reliable than fencing the chain described above.
By the way, decommissioned batteries are quite suitable for such an application, which can no longer give the starter 200 amperes, but they are still quite capable of giving 3 ... 5 amperes to a laptop for a long time.