The short answer is you can not charge a 12 Volt Battery with a 9 Volt battery. If there is a will there is a way .. Lets assume your 9 Volt battery has enough capacity to power a circuit (lots o A/h Ampere Hours) , then you could build a device to make 13 or 14 volts out of the 9 Volts and charge the 12 Volt battery..
Likewise, can you charge a 9 volt battery with a 12 volt charger?
A charger for a car battery to charge a 9V alkaline pocket radio battery? No way! Actually, in general, no. You should NEVER use a mismatched charger and battery.
Also, how many volts do you need to charge a 12 volt battery? The typical charging voltage is between 2.15 volts per cell (12.9 volts for a 12V 6 cell battery) and 2.35 volts per cell (14.1 volts for a 12V 6 cell battery). These voltages are appropriate to apply to a fully charged battery without overcharging or damage.
Keeping this in view, can you charge a 14v battery with a 12v charger?
So you definitely need a charger having more than 13.2V. So I prefer using a 14V charger to charge a 12V battery. You can also use a boost converter with the 13V charger to increase the output voltage from 13V to 14V. This is the most cost effective way.
Can you charge a 9 volt battery with a 6 volt charger?
you can charge 6v bat from 9 volts charger. connect a 6v 500ma[flash light bulb will do] bulb in series with the connection to the charging battery. exess voltage will drop in the bulb and 6v battery get charged probably takes a little longer time. make sure of polarity of connections.
Related Question Answers
Can a 9v battery be recharged?
These Li-Ion cells can be recharged 1000 times so you never need to buy anymore a regular 9v battery. The weight of this device is the quarter of a simple 9v battery.It has the same capacity. The 9 volt output CAN'T BE SHORTED!How do you charge a battery?
Basic instructions for most chargers include: - Make sure the charger is off.
- Hook-up the positive cable on the charger to the positive terminal on the battery.
- Hook up the negative cable on the charger to the negative terminal on the battery.
- Set the charger to the slowest charge rate.
Can I charge a 9v battery with a 5v charger?
You would not be able to charge a 9V with a 5V source. You can still charge that battery till 5V but once you cross that current will start flowing from the battery back to the source.How do you charge a 9 volt battery without a charger?
Steps - Remove the battery from the device.
- Find some AA, AAA, or 9-volt batteries.
- Identify the positive and negative connectors on each battery.
- Match voltage of your battery which need to charge and other battery (AA, AAA or others with enough power to provide).
- Obtain two pieces of metal wire.
How do you charge a battery with a power supply?
To charge a 12-volt lead acid battery (six cells) to a voltage limit of 2.40V, set the voltage to 14.40V (6 x 2.40). Select the charge current according to battery size. For lead acid, this is between 10 and 30 percent of the rated capacity. A 10Ah battery at 30 percent charges at about 3A; the percentage can be lower.How long does it take to charge a 9 volt battery?
Give your batteries several charges/discharges, they should charge in 2 hours as advertised.How do you charge a NiMH battery?
Overnight Charging The cheapest way to charge a nickel metal hydride battery is to charge at C/10 or below (10% of the rated capacity per hour). So a 100 mAH battery would be charged at 10 mA for 15 hours. This method does not require an end-of-charge sensor and ensures a full charge.Can I use a 12v DC power supply on a 9v DC?
12V AC will kill a 9v DC device. Edit: Also the plugs shouldn't fit properly, which is an indication that you shouldn't do it.Can I use a 12v power supply to charge a car battery?
if you want to charge a 12 volt lead-acid car battery with a 12 volt DC power supply which is not a battery charger, then no that won't work. A car battery at full charge is 12.65 volts.Will a 12 volt power supply charge a battery?
No, you can't charge a 12 volt battery with a 12 volt power supply because the charging voltage always needs to be greater than the battery voltage (12 volts). 6 to 13.8 volts is usually a good voltage for charging a 12 volt lead-acid battery at normal temperatures.Is 15 volts too high?
So, to answer your question, Yes, 15 volts is too high. A regulated charger will hold the voltage to 13.5 to 13.8 volts once the voltage has peaked, to prevent gassing and overcharging, and the current will drop to almost zero in a healthy battery.Can I use 19v charger for 12v?
19V is generally going to fry any device that was designed to run at 12V (especially consumer products). And while it's not very likely it might also catch fire. For a AC adapter to work you will need one with the exact voltage (12V) and an equal or higher current rating (1.5A or more).Can a 15v adapter 12v device?
the 15v (i guess its dc) will power a 12v ozone device. I read that things need to have the same polarity, same v, but varies MA is fine. The voltage should match and as long as the power supply has at least the amperage required by the device you should be fine.Will a trickle charger charge a dead battery?
The alternator of a car is responsible for maintaining a healthy battery, but it can't recharge a dead battery. But, a trickle charger definitely could charge a dead battery. Although it will take a long time for it to bring a dead battery to an acceptable level of charge.Can I use a DC power supply to charge a battery?
You can easily recharge batteries if you have a DC power supply. All that is needed to recharge battery cells is DC current. With DC current, electrons will flow back into the battery, establishing the electric potential, or voltage, that a battery was meant to have when it's fully charged.What is the correct charging voltage for a car?
12.6 volts
How many amps are in a 12 volt battery?
4. How many amps does a 12-volt car battery have? A typical car battery with 12 volts rating has a capacity of 48 Ah. It means that when fully charged, the battery can deliver one amp for 48 hours, two amps for 24 hours and so on.How long does it take to charge a 12 volt battery?
12-24 hours
What voltage is too low for a 12 volt battery?
When any 12-volt battery is discharged below 12.4 volts, sulfation begins to occur within the battery. Over time, this sulfation will diminish both the performance and lifespan of the battery. Regular use of a quality battery maintainer will keep batteries properly charged and extend their useful life. 
