External car battery Chargers

Portable Car Battery Chargers
Connecting the cables the right way is an essential part of safe car battery charging. Sam Edwards / Caiaimage / Getty

Aside from the alternator, the battery is the most important component in any car’s electrical system. It provides the juice to run all of your fancy electronics when the engine isn’t running, and when the engine is running, it plays an essential role in the proper functionality of the alternator’s voltage regulator. Unlike outdated electrical systems that used generators and could function without a battery, modern automotive electrical systems need a battery in order to function properly.

A dead battery means a car that won’t start, and an alternator that will have to work too hard—potentially to the point of failure—which is why the subject of properly charging a car battery is so vital in terms of modern automotive technology. Although a vehicle’s alternator is capable of keeping its battery charged under normal circumstances, batteries do go dead for a variety of reasons, and there also comes a time in the life of every car battery when it’s just time to move on.

What Charges a Car Battery?

When properly charged, and in good working order, a car battery will typically read at about 12.4 to 12.6 volts and have enough reserve capacity to power a 25A load for anywhere from nine to 15 hours, at which point the voltage will have dropped below 10.5 volts, and the battery probably won’t be able to start the car. Extreme temperatures, and wear incurred through the normal cycle of charging and discharging, can reduce the reserve capacity, which is why you may come back to a dead battery after leaving your headlights on while running a short errand, while in another situation, you may be able to leave them on all day and still start the engine just fine.

In any case, there are two ways that a car battery can be charged: by the alternator, or by an external charger. Normal battery usage, like running the radio or dome lights while the engine if off, will be replenished naturally the next time you start your car. As the RPM of the engine increase, the alternator’s ability to generate electricity also increase, and any power that isn’t being used by accessories like your headlights will be available to charge your battery.

In some cases, like when you’re idling at a stop light, there may not be enough power to run all of your accessories, in which case the battery will actually discharge further instead of receiving a charge.

Charging a Car Battery

If the alternator isn’t up to the task, the other way of charging a car battery is to use an external charger. These chargers run off AC power and provide 12V DC at relatively low voltages, which is the best way to charge a completely dead battery. Charging a dead battery with an excessively high voltage can increase the off-gassing of hydrogen, which can, in turn, result in a hazardous situation where the battery might explode. This is why it’s important to take the same care when hooking up a car battery charger as you would when hooking up jumper cables, and also why it's often a good idea to use a trickle charger.

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.
Arteck Car Jump Starter Auto Battery Charger and 8000mAh External Battery Charger Car Jumper for 12V Automotive, Motorcycle, Tractor, Boat, Phone with Clamps, LED Flashlight, 300A Peak 2.5L Gas Max
Automotive Parts and Accessories (Arteck)
  • Car Jump Starter: Jump your car up to 20 times when away from electrical mains (support up to 2.5L Gasoline) with built-in heavy duty clamps and cables and 300 amp...
  • External Battery Charger: Charge phones, tablets or other device and speed of up to 2.1 amps via the USB (8mAh capacity).
  • Safety Protection: Premium cells, circuitry and safety features protect you and your device from surge or short circuits. Recharges in just 4 hours using the included...
  • LED Light: Ultra-bright LED flash light, strobe light, and SOS signal light that lasts 120 hours.
  • What You Get: Arteck Multi-Functional Car Jump Starter external Battery, micro USB charging cable, jumper clamps, user manual, our fan-favorite 2 years warranty...
Battery Pack RAVPower Portable Charger 22000mAh 5.8A Output 3-Port Power Bank (2.4A Input, Triple iSmart 2.0 USB Ports, Li-polymer Battery) Portable Battery Charger For Smartphones Tablets - Black
Wireless (RAVPower)
  • Highest Output for 3 Devices Pocket Juice: 3 USB ports for a total current output of 5.8A (2.4A max per port). The Power Bank can charge two iPads and one iPhone...
  • Weeklong 22mAh Portable Charger for Phones: Charge your iPhone 7 about 8 times, iPhone 7 plus over 5 times, iPhone 6s up to 9 times, a Galaxy S7 up to 5 times, or...
  • Power Efficient Battery: Invest in a high-density Li-polymer portable usb charger that retains 70-80% of its capacity after 500 charge cycles. It s the daily choice...
  • New & Improved iSmart 2.0: The new and improved iSmart 2.0 adjusts current and voltage to minimize charging time. Whereas, Panasonic Smart IC frequency technology...
  • Excellent Quality In & Out: On the outside, a UL94 V-0 fire-resistant shell used by Mercedes-Benz, BMW, and others for their luxury cars. On the inside, the...
Jackery Mini Premium 3350mAh Portable Charger - External Battery Pack, Power Bank, & Portable iPhone Charger for iPhone 7, 7 Plus, 6s, 6s Plus, iPad, Samsung Galaxy S7, Samsung Galaxy S6 (Black)
Wireless (Jackery)
  • TRAVEL CHARGER: The world s smallest external battery charger and power bank is compact, portable & stylish and perfect for long flights, road trips, or whenever...
  • SMARTPHONES & TABLETS: Portable battery charger can be used as Samsung Galaxy S7 charger, Samsung Galaxy S6 charger, Samsung Galaxy S5 portable charger, iPhone...
  • ADVANCED POWER BANK: High-capacity portable phone charger with 3350mAh rechargeable battery power capacity adds 1 full charge to iPhones and Android devices.
  • POWERFUL BATTERY PACK: Ultra reliable A+ lithium-ion battery cells and premium microchips create high-quality portable charger with 4 layers of smart safety protection...
  • PORTABLE BATTERY INCLUDES: Package includes: Jackery Mini External Battery, premium Micro USB to USB 2.0 cable.
Nekteck Car Jump Starter Portable Power Bank External Battery Charger 500A Peak with 12000mAh - Emergency Jump Pack Auto Jumper for Sedan Van SUV Boat Smartphone USB Device and More
Automotive Parts and Accessories (Nekteck)
  • Compact powerhouse that fits in your back pocket, will jump start your car, Also charges smartphones, tablets, speakers, and more.
  • 500-amps of power jump starts your 5L gas or 3L diesel cars, motorcycles, ATVs, lawn mowers, and more up to 12 times, and to get you back on the road fast.
  • Real 12mAh high battery capacity for cellphone and tablet (include Micro-USB Cable for any Micro-USB supported devices)
  • Built-in Super bright LED flashlight in case you are stranded at night.
  • Safety protection for overcharge, overvoltage, overcurrent, and short-circuit.

Related posts: