Laptop charger to charge car battery

Emergency Car Battery Charger - YouTube

Most starter batteries are rated in CCA: cold cranking amps. The equivalent amp-hour rating is typically around 8% of the CCA. So if you have a 600 CCA starter battery, its AH rating is somewhere around 50. That means it can provide 50 amps for one hour, or one amp for 50 hours, or any combination in between. Your laptop charger probably draws somewhere around 50 watts at 12 volts. That means it draws about 4 amps. So charging it from the car battery with the engine switched off means it will charge for around 12 hours (50 divided by 4) before it depletes the car's battery. Reduce that number by 15% or so to allow for the inefficiencies of inverting from 12V to 110V then back to 12V again (or 9 or whatever the laptop charger uses). Ten hours of charging, tops. Since most laptops charge in way less time than that, you should be OK. But if you leave it plugged in for more than about four hours, you can expect starting the car - particularly if in cold weather - to be somewhat less than enthusiastic.

Starter batteries are not designed for a steady current draw over a long period of time. They are designed for a very heavy load for a very short time. So significantly depleting one multiple times could result in shorter life. If I needed to charge my laptop from the car's battery on a continuing basis, I'd be inclined to buy a car battery that is a hybrid starter/deep cycle one. Any good battery store will have two or three of those, but expect to pay $$.

Enkey Enkey 150W Car Power Inverter DC 12V to 110V AC Converter with 3.1A Dual USB Charger
Car Audio or Theater (Enkey)
  • Premium 150w car power inverter with 2 USB ports and AC outlets. Dual USB ports can charge most phones and tablets simultaneously (Max 3.1A total output), while...
  • Travel kit: just about credit card size - 3.2 x 2.5 x 1.5 inches, space-saving and easy storage, with aluminum shell design, extremely portable and lightweight at...
  • Multi-Protection: built-in fuse to protect your device, safe charging design provides protection against, overheating, under and over voltage charging, short circuiting...
  • Durable metal housing provides advanced protection from drops and bumps. Integrated very silent cooling fan helps reduce heat and prevents shortages
  • What you get: Enkey150W car power inverter, user manual, 18 months warranty and 100% customer service /Please make sure that you buy from Enkey
BMK BLUEMICKEY BMK 200W DC to AC Car Power Inverter/Converter with 4.8A Dual USB Charger Adapter+Dual AC Outlet Plug+Cigarette Lighter for Car/Truck/Travel
Car Audio or Theater (BMK BLUEMICKEY)
  • √ POWERFUL CHARGING:3 IN-1 BMK powerful 200 Watts car power inverter provides continuous DC to AC power, featuring 2 AC outlets, cigarette lighter socket and 2 USB...
  • √ SAFETY DESIGN : Power inverter safety charging design provides protection against overheating, under and over voltage charging, short circuiting, overloads, and...
  • √ SMART PORTS : Aside from the two 115V AC ports and cigarette lighter socket, it also features two USB ports with built-in SMART chip that can identify the attached...
  • √ ULTRA COMPACT & LIGHTWEIGHT DESIGN: Just 8.3×2.3×1.9 inches for space-saving and easy storage. Extremely portable power inverter and lightweight at only 11.6...
  • √ Special offer: Save 10% on Fully Automatic Battery Charger when you purchase 1 or more 200W car power converter .For more detail to the Special Offers and Product...
iRULU 500W Power Inverter for Car DC 12V To 110V AC Automatic Converter With 4.2A Dual USB Charger for Laptop,Game,Blender,Cooler,Cell Phone,Tablet (Black)
Office Product (iRULU)
  • Provides 500 Watts continuous DC to AC power and 1 Watts instantaneous power, featuring 2 AC outlets and 2 USB ports for multi-purpose charging
  • Fast Charging - 2 USB charging ports deliver up to 4.2A currents with smart IC charging technology
  • Safety:Built-in 2*40 amps Fuse & Cooling Fan with Full-Protection. cooling fan would run faster when the inverter gets warmer. reduces the noise to the least...
  • Ultra Compact and Lightweight: ideal for use on vacations, work trips, and camping. 24 inch cord allows it to be plugged into almost any vehicle
  • Contains: iRULU 500W Power Inverter, User Manual,2×Car battery clip
Nekteck Multifunction Car Jump Starter Portable External Battery Charger 600A Peak With 16800mAh High Capacity - Emergency Power Bank Auto Heavy Duty Jumper For Sedan Truck, Van, SUV, Laptop and More
Automotive Parts and Accessories (Nekteck)
  • Compact powerhouse that fits in your back pocket, will jump start a your car, Also charges smartphones, tablets, speakers, and laptops.
  • 600-amps of power jump starts your 6L gas or 5L diesel cars, motorcycles, ATVs, lawn mowers, tractors, and more up to 12 times, and to get you back on the road fast.
  • 16800mAh high battery capacity for cellphone, tablet (ONLY include Micro-USB Cable) and laptops (ONLY 8 adapters included)
  • Built-in Super bright LED flashlight in case you are stranded at night.
  • Safety protection for overcharge, overvoltage, overcurrent, and short-circuit.
BESTEK BESTEK 200W Power Inverter DC 12V to 110V AC Inverter with 4.2A 4-Port USB Car Adapter
Wireless (BESTEK)
  • BESTEK Advantage?America s #1 power inverter brand. Provides 200 watts continuous DC to AC power and 500 watts peak output power to charge your multiple electronic...
  • DC to AC Converter: 3 AC outlets and 4.2A 4 USB charging ports ideal for powering 7 devices simultaneously, great for charging smartphones, laptop, tablets, GPS...
  • 2.5-foot cigarette lighter plug convenient for backseat use.Ultra compact design perfect for you to use inverter on the road,campsites or anywhere that power is...
  • Multi Protection: built-in fuse and cooling fan protection. This power inverter has low battery alarm, low battery shutdown, overload protection, short circuit protection
  • What You Get: BESTEK 200W Power Inverter, User Manual, Our 18-month warranty and friendly customer service

Related posts: