How to make a car battery charger?

Battery Solutions: How to make a car battery charger and
Here's my inverter.
It takes in 12 volts DC from the battery and produces 110 volts AC that I can plug my sewing machine, laptop, etc into. You can get them for cheap at any truckstop or discount store now.

This model has a low-voltage disconnect feature which is a big help.
When battery voltage drops below 11 volts it beeps and turns off.
That protects your battery from over-discharging.

Sulfating and De-Sulfating
If you run your battery down further than 10.5 or 11 volts, or if you fail to charge it up again soon enough, sulfate crystals will form on the battery plates.
The sides of your battery will bulge from the crystal deposits on the plates, and your battery won't take a charge anymore. There are tricks to fix this. Look up "desulphate", "desulfate"(both spellings are ok), "pulse charger", "battery edta". According to one vendor of desulfating products, 75% of the lead-acid batteries removed from service can be rejuvenated with these techniques. The others are suffering from shorts, open circuits, and similarly less correctable flaws.

To measure your battery's capacity
Plug in an mechanical electric clock and a known load, like a 5 watt lightbulb. See how long it takes to run down the battery til it shuts off. For example: 5watts/12 volts = 0.42 amps. If it takes three hours to discharge your battery after it's fully charged, your capacity is 3 * 0.42 = 1.26 amp-hours. (not very much) A typical emergency-lighting gel-cell has 7 amp-hours capacity.

Battery Tender Plus 021-0128, 1.25 Amp Battery Charger is a Smart Charger, it will Fully Charge and Maintain a Battery at Proper Storage Voltage without the Damaging Effects Caused by Trickle Chargers
Automotive Parts and Accessories (Battery Tender)
  • Temperature compensated to ensure optimum charge voltage according to ambient temperature
  • Automatically switches from full charge to float charging mode
  • Charges as fast or faster than 3a charger
  • Reverse-polarity protection to ensure user safety
  • Red & Green indicator lights
  • Battery Tender Plus 12V - 1.25 Amp, Automatically switches from full charge to float charging mode
  • The Battery Tender Plus is a 1.25-amp battery charger designed to fully charge a battery and maintain it at proper storage voltage without the damaging effects caused...
  • Included is a quick connect harness for hard to reach areas
  • Temperature compensated to ensure optimum charge voltage according to ambient temperature
  • Battery Tender at 1.25-amp will charge as fast or faster than any 3-amp charger available, Reverse Polarity Protection to ensure user safety Red and Green Lights...
  • This item is not California or Oregon energy compliant.
  • To purchase charger if you live in California or Oregon please see attery Tender 022-0185G Charger/Maintainer
LeFun FM Transmitter, Wireless Radio Adapter Car Kit FM Modulator Music Player with AUX Input TF Slot USB Car Charger and Bluetooth Receiver with Hands-free Calling
Car Audio or Theater (LeFun)
  • BROAD COMPATIBILITY: Works with Smartphones, like iphone, ipad and android phones, ipod; And supports AUX input, Micro SD, TF card or MP3 players via 3.5mm audio...
  • HIFI QUALITY& HAN-FREE CALL: With A2DP technology, enjoy your music; Built-in microphone offers your hands free talking.
  • LARGER DISPLAY SCREEN: 1.44 LED display screen shows your car battery level when car starts, phone number for incoming calls & name of songs playing.
  • USB CAR CHARGER: Charging your cellphones or other devices via an universal USB port. Like iPhone; Android, LG.
  • EASY TO OPERATION: Plug the FM Transmitter in the car cigarette lighter, control it and the car radio at the same frequency (frequency range from 87.5 to 108 Mhz)...
Battery Tender Battery Tender 081-0158 Black Quick Disconnect Plug with USB Charger
Automotive Parts and Accessories (Battery Tender)
  • 2.1 amps output
  • Quite portable
  • Rubber flap protects charger connectors
  • Perfect for a charging device for your bike, ATV, etc.
  • Attaches to existing Battery Tender quick disconnect
Accessory Power GOgroove FlexSMART X2 Bluetooth FM Transmitter for Car Radio w/ USB Charger , Multipoint , Music Controls , Hands Free Microphone for iPhone , Android
Wireless (Accessory Power)
  • The X2 is equipped with On-Board Volume, Play Settings, & Phone Controls. Works for Apple , Samsung , HTC , LG , Sony , Motorola , Nokia , ASUS , Microsoft &...
  • Now featuring Multipoint Bluetooth Connectivity - pair 2 devices simultaneously so you can take calls & stream audio from either! Trade off DJ ing and have both...
  • A built-in microphone with enhanced voice detection makes hands-free calls easy - plug-in, sync your phone, and you re ready to talk!
  • The compact design and flexible neck ensure an ideal fit in nearly any vehicle, while a universal USB charge port lets you power up your device while talking or...
  • FREE 3 YEAR WARRANTY - TECH SPECS: Bluetooth Version: V2.1 / Bluetooth Profiles: HSP, HFP, A2DP, & AVRCP / Frequency Range: 88.1 - 107.9 MHz / Input: DC 12V...
Roadpro Roadpro 12V Battery Clip-On and Cigarette Lighter Adapter
Automotive Parts and Accessories (Roadpro)
  • Manufactured to power 12 volt appliances
  • Holds Only 10 Amps of Power
  • Will Not Handle Surges
  • Clips attach directly to the vehicle battery
  • Illuminated front panel cigarette lighter port

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