Keep your battery in top form
Vehicles today are often equipped with a wide range of power-robbing accessories such as a GPS navigation unit, stereo sound system, video player, daytime running lights, and many other electrical convenience functions. All these items place a high demand on a vehicle's battery. Battery chargers from Bosch are first aid for exhausted batteries and return them to top condition.
The intelligent, portable C3 and C7 chargers from Bosch provide battery charging that is quick, easy and safe.
Application and Handling
- Charge and maintain (trickle charge) 6V/12V (C3) and 12V/24V (C7) batteries
- Suitable for all types of lead-acid batteries - AGM, WET, GEL, open, VRLA and cold
- Easy and convenient one-button operation
- Quick disconnect harness and removable clamps for convenient use (i.e. for motorcycle batteries)
One-touch, fully automated charger
Easy to operate:
- Charger detects battery voltage automatically
- Operator can't choose the "wrong" charger mode
MCU (micro-computer unit) processor controlled
Safe in use:
- Never "overcharge" or damage the battery
- Reverse polarity protection and indication
- No current on clamps if charger is incorrectly connected
- Safe to leave the charger connected (automatic trickle charging)
IP65 protected, solid construction
- Dust or splash water do not harm the charger
- Solid and well built case, cables and cable connection
Compact design and clever accessories
Easy to handle:
- Very small and lightweight
- Most convenient mobile (hang from the hood) and stationary use
- Quick connect harness and removable clamps ->motorcycles
Refresh and boost (C7 only)
Revival of exhausted batteries provided that the sulphation process has not gone too far
Power backup (C7 only)
All electronic systems are supplied with enough power when charging the battery
Download PDFs of our Bosch Batteries, Battery Chargers and Accessories brochures here.
Where can I buy Bosch battery charger/maintainers and accessories?
What is the difference between a Bosch C3 and C7 battery charger/maintainers?
The C3 battery charger/maintainer is designed to charge 6V/12V lead acid batteries. The C7 battery charger/maintainer is designed to charge 12V/24V lead acid batteries. The C7 also has a regeneration mode, constant current mode, and a memory function that the C3 charger/maintainer does not have.
Both the C3 and C7 Bosch charger/maintainers are able to charge more than one voltage unlike many of the other charger/maintainers in the market.
What’s in the box?
In the C3 box you will find a Bosch Smart Battery charger/maintainer, charger mounting hook, charger cable with built in fuse, 2 fully insulated charger clamps, harness with mounting rings, and instruction manual.
In the C7 box you will find a Bosch Smart Battery charger/maintainer, charger mounting bracket, charger cable with built in fuse, 2 fully insulated charger clamps, harness with mounting rings and instruction manual.
What features do Bosch battery charger/maintainers include?
Both the C3 and C7 Bosch battery charger/maintainers include features like the SmartAMPs Technology, One Touch Button, Automatic Shut OFF, Automatic Recovery Mode to recover sulfated batteries, and Automatic Maintenance charging that allows the charger to be left connected to the battery with no risk of overcharging. The C7 battery charger/maintainer also has a Regeneration Mode to help charge deeply discharged batteries from cars with lights left on overnight, Constant Current Mode, and a Memory Function.
Bosh battery charger/maintainers are water and splash proof as well as protected against spark, short circuit, reverse polarity, and overheating.
For more details on the features of the C3 and C7 charger/maintainers, please refer to the Features/Benefits tab.
What is a smart battery charger?
The Bosch battery charger/maintainers are smart battery chargers. The Bosch Battery Charger and Maintainer is a smart charger that is operated by a MCU processor that provides state-of-the-art charging technology that allows the charger to interact with and respond to the condition of the battery. It modifies its charge action based on the feedback from the battery in order to provide a high quality charge that restores sulfated and discharged batteries. It uses SmartAMPS Technology feature that continuously monitors the condition of the battery at every phase to charge at the optimum current in order to avoid under-or overcharging. Smart chargers will automatically detect the voltage of the battery. You can leave the charger/maintainer plugged to the battery all day/night without harming it.
How is the Bosch Smart Charger/Maintainer different than a manual or automatic battery charger?
Manual and automatic chargers treat all batteries the same no matter what condition they are in and charge with a steady, unregulated current. The Bosch Battery Charger and Maintainer however uses SmartAmps, the optimum charge current depending on the battery’s condition and the current charging stage, to provide a fast high quality charge that ensures the longest life of the battery.
Why is there a price difference between the C3 and the C7?
The C3 battery charger/maintainer charges 6V/12V batteries with a capacity between 1.2 and 120 Ah while the C7 battery charger/maintainer charges 12V/24V batteries with a capacity between 14 and 230 Ah. The C7 also has a regeneration mode, constant current mode, and a memory function that the C3 charger/maintainer does not have.
What is SmartAMPS technology?
Bosch Battery Chargers/Maintainers use SmartAMPS Technology which is a feature that continuously monitors the condition of your battery at every phase. This ensures that your battery is continuously charged at the optimal level in order to avoid under-or overcharging. The SmartAMPs technology also provides a fast, high quality charge that ensures the longest life of your battery.
What is the Bosch brand and what are its brand values?
Robert Bosch (commonly known as Bosch) is a leading German global supplier of technology and services in the areas of automotive and industrial technology, consumer goods, and building. It is the world largest supplier of automotive components and stands for precision, quality, and longevity. The Bosch motto, “Invented for Life,” reflects its goal to develop innovative, high quality technologies that make life more efficient, safer and more comfortable.
I’ve always thought that Bosch specialized in automotive parts for European vehicles. Are Bosch Battery Charger/Maintainers a good fit for my battery manufactured in the US?
With Bosch battery charger/maintainers you can charge domestic as well as foreign made car batteries. Bosch has been supplying automotive parts for domestic applications that meet or exceed OE specifications for many decades.
Does Bosch carry batteries?
Yes, Bosch also carries batteries. They are the premium battery brand in over 104 countries in the world and satisfy the highest starting and power supply standards especially for new vehicles with many electrical consumers.
Where can I get a copy of the user manual?
You can download a copy of the user manual from our website under the document section of the Bosch Battery Charger Page.
What is the warranty on Bosch battery chargers/maintainer?
Robert Bosch LLC (seller) warrants to the first using purchaser only that the battery charger/maintainer sold to the first using purchaser by seller or its authorized dealer, retailers or service centers in the United State, Canada and Mexico will be free from defects in material or workmanship for a period of two (2) years from date of purchase. SELLER’s sole obligation and your exclusive remedy under this Limited Warranty and, to the extend permitted by law, any warranty or condition implied by law, shall be the repair or replacement of parts, without charge, which are defective in material or workmanship. The Limited Warranty provided in this Statement excludes any defects or damage arising from accident, alteration, misuse, abuse, improper installation, unauthorized service work, external forces beyond seller’s control, such as fire, flood, and other acts of God. The limited warranty further excludes normal wear and tear on parts and damage to fragile components (e.g. switches).
When can a battery be charged/ recharged?
In general you can always charge a battery as long as it is not completely drained, frozen, or at the end of its life-cycle.
How do I properly connect the cables?
For a negative-grounded vehicle, connect the cables by first connecting the positive (red) charger clamp to the positive post of the battery. Then you connect the negative charger clamp to the car frame or engine block away from the battery.
For a positive-grounded vehicle, connect the negative (black) charger clamp to the negative post of the battery. Then you connect the positive (red) clamp to the car frame or engine block away from the battery.
How do I use the Bosch battery charger/maintainer?
Its is as easy as Connect – Plug In – Turn On. You do not need to be a specialist to use the Bosch Battery charger/maintainer. Simply attach the two insulated charger clamps integrated into the opposite end to the appropriate battery posts of the battery being charged or maintained. Then plug in the AC power cord, integrated at one end of the charger/maintainer, to a standard 110-volt household outlet. Finally, use the mode button to select from different charging modes to instantly begin charging.
Where do I call about specific questions about Bosch chargers/maintainers?
If you have specific questions about Bosch chargers/maintainers, you can click on the contact link at the top of the page.
What can extend the life of a battery?
You can do the following things to extend the life of your battery:
- Use warm water and a mild detergent to remove grease and dirt from the plastic surface of the battery. Dirt can actually act as a conductive agent, causing the battery to constantly discharge slightly.
- In removing or cleaning the battery, remove first (-) ground cable followed by the (+) cable. If you are going to reinstall the battery, the (+) cable must be put first before the (-) ground cable. In this way, you can avoid a short circuit if the wrench accidentally touches the grounded part of the vehicle.
- Make sure the battery is firmly secured to its mounting bracket. An unsecured battery that shifts around can become damaged, and possibly cause short circuits. All exposed metal parts of the terminals and cables should be greased to prevent future corrosion.
- Change the battery if you happen to see any cracks, vents or swelled battery casing. Most likely your battery is gradually failing and replacement is inevitable.
- Check the terminals where the battery cables connect to be sure they are tight and free of corrosion. If corrosion is present get a qualified technician to clean the terminals.
Is AMP (amperage) important when selecting a battery charger?
Amp stands for Ampere and is the measure of the electric charge passing a point in an electric circuit. It is the strength of an electric current. Too high of an amperage, such as in rapid chargers, can overcharge and cause damage to your battery. Bosch Battery Chargers and Maintainers uses SmartAmps technology continuously monitors the condition of your battery at every phase. This ensures that your battery is continuously charged at the optimal level in order to avoid under-or overcharging. The SmartAMPs technology also provides a fast, high quality charge that ensures the longest life of your battery.
Can I charge other types of batteries besides acid-lead batteries?
No, with the Bosch battery charger/maintainers you can only charge lead-acid batteries which you can find in the automotive industry. These are batteries that you can find in most cars, trucks, boats, etc. Other batteries like dry-cell batteries or regular household batteries cannot be charged using the Bosch battery charger/maintainer.
Can I charge a frozen battery?
Never charge a frozen battery. Charging a frozen battery may cause battery explosion. Remove the battery from the vehicle, bring it into a warm room and let it thaw before charging.
What type of batteries can be charged/ What do I do if I don’t know what type of battery I have?
Generally, all types of batteries (AGM, WET (flooded), GEL, and VRLA) can be charged which you can find in cars, trucks, buses, tractors, boats, jet skis, motorcycles etc. The Bosch C3 battery charger/maintainer is designed to charge 6V/12V batteries which you can find in:
- 6V/12V antique cars
- Light trucks
- Jet skis
The Bosch C7 charger/maintainer is designed to charge 12V/24V batteries for vehicles with a higher power demand that you can find in:
- Antique cars
- Jet skis
Are there different types of lead-acid batteries?
Yes, there are different types of lead acid batteries. These include AGM, WET, and GEL.
What is Sulfation?
Lead sulfate (PbSO4) is formed during the discharge state. If a lead acid battery is not recharged immediately, the lead sulfate will begin to form hard crystals that will no longer dissolve when recharged.
What causes sulfation?
Sulfation can occur if the battery is kept at low charge (below 80%) and never has the opportunity to receive a full charge. Short distance driving while running windshield wiper and electric heaters contributes to this.
How do you fix a sulfated battery?
Sulfation can be partially reversed by pulse conditioning.
What is Overcharging?
Overcharging generates oxygen & hydrogen gas by electrolysis of water. It is charging the battery more than needed.
What causes overcharging?
Charging with a high amp charger can charge the battery too quickly. Also leaving an unattended charger for too long.
Can I leave the Bosch battery charger/maintainer connected to the battery without overcharging or damaging it?
Yes. Bosch charger/maintainers can be left connected to the battery because they will automatically stop charging the battery when it is fully charged. They will then continue to monitor the battery and switch to maintenance mode when the voltage drops. The battery cannot be overcharged or damaged.
Can I charge a 6 Volt (6V) battery with a 24 Volt (24V) Charger?
No, you cannot. Bosch battery charger/maintainers use SmartAMPs Technology that automatically recognizes the voltage of the battery. If an abnormal situation occurs, such as when the voltage of battery and charger is different or when the charger is incorrectly connected or when there is an abnormal charging time, the charger switches automatically to standby mode to protect the battery from damage.
Can I charge a 24 Volt (24V) battery with a 6 Volt (6V) Charger?
Yes, however it is not recommended because it takes a very long time to fully charge the battery.