i want to make a portable laptop charger with a wall outlet and a battery how do i wire it and what wire do i use?
Get 12V SLA battery, maybe 18Ah. Get a 150W inverter. Get a 2A SLA charger. All the above will come with the wire you need, and specific instructions to wire to the battery. Build or buy a frame or box to hold it all together. Simply wire the charger and inverter to the battery, the inverter with a 15A fuse, the charger with a 5A fuse. Set up the inverter and charger so they are convenient to access and use. Or, simply go buy a totable 12V power pack with inverter.
Why bother? There are all kinds of portable inverters on the market. However, the circuit design is straight forward. For a laptop it gets a little more complicated as to current regulating and filtering. Basically, you just need a battery of the proper voltage and output Ahr current. Then it has a plug and a socket shunted across it. The plug is used to charge it and the socket to plug your device into. A 12 v video camcorder battery with a cigaret lighter plug on it ( to charge from a car lighter socket ) and a voltage reg. ic ( for say 5v )and a current limniting resistor ahead of a proper socket to fit your devices plug works quite well. I built one with the reg ic etc in a 35mm empty film can. To use 120 ac input to charge the battery gets a little more work, but the idea is the same. I have one that uses a motorcycle battery to run ham equipment in the field. Ham op.
