First of all this is my first question on this forum. If I opened the question on wrong place, sorry about that.
I'm asking, doing this is possible or harmful?




Also here is the charger's specs:

 

Hello,

The way you show will not work.
You can not put the two 9 volts batteries in series.
Better put the 9 volts batteries directly in the charger.

Bertus

 

Hello,

The way you show will not work.
You can not put the two 9 volts batteries in series.
Better put the 9 volts batteries directly in the charger.

Bertus

Thanks a lot for your answer! But may I ask, why it wont work?

 

Hello,

The voltage delivered by the charger will likeley be to low to charge the two batteries in series.

Bertus

 

Hello,

The voltage delivered by the charger will likeley be to low to charge the two batteries in series.

Bertus

But if I will charge batteries x2 times than normal, it will be the same? I mean, it shouldnt be harmful?
Also if I'm asking too much questions, sorry but your signature encouraged me

 

Hello,

Looking at the charger, it is possible to charge two 9 volts batteries.
The stated charging current is 25 mA.
The batteries will likely be fully charged in about 10 to 15 hours.
What does the manual of the charger say?

Bertus

 

@bertus I dont have the manual but if I remember correctly it says/shows like your way, the standart charging of 2 9v batteries. I mean my asked way shouldnt be problematic on theoretically.

 

Is the charger able to charge one battery at a time?
If it can do that then it cannot charge two batteries in series.

 

Is the charger able to charge one battery at a time?
If it can do that then it cannot charge two batteries in series.

Charger has two 9v battery ports and normally can charge both of them at the same time if you ask this.

 

Hello,

Reading the following page, it shows two independent chargeports:
https://www.camelion.com/en/products/chargers/plug-in-charger/bc-0904s/

Bertus

 

The charger does not have an 18V output. It has two +9V outputs but only one 0V output.
Your alligator clips fed 9V to 18V worth of batteries that will not work.

 

Looks like I shouldnt do fancy experiments Thanks for all replies guys.

 

Charger has two 9v battery ports and normally can charge both of them at the same time if you ask this.

That is not what I asked.
The answer was given by the posts that followed.
You can charge one battery.
Hence you cannot charge two batteries in series.

 

There are 2 channels with 2 LED 'charging' indicators.

Each channel can charge (2 x 2.8V AAA) or (2 x 2.8V AA) or (1 x 9V size).

Nandu

 

Two 9V batteries placed in series will equal 18 volts. To charge them the way you show would require a charger that can output more than 18 volts. I don't know the correct charge voltage for a 9V battery, so lets make up some numbers: Suppose a 9V chargeable battery needs to be charged at 9.5 volts (again, remember, I'm making these numbers up) - that would take 19 volts to charge them the way you show.

Not sure why I got this impression but it seemed like you were suggesting that charging the batteries longer would accomplish the task. No, it won't. Batteries, when properly charged, take the current they need until full. When their voltages reach the proper level they stop drawing current. Well, in most cases. Nevertheless, leaving them charging the way you show will likely drain them instead of charge them.

You ask doing this will cause harm. No, it won't. Not unless you consider draining chargeable batteries below their safe level harmful to the batteries.

 

Fundamentally, the voltage the charger puts out has to be greater than the battery voltage. "protection" usually involves at a minimum current limiting. Li-Ion batteries may have a protection board and/or a temperature sensor.

For a specific battery chemistry, there is a specific algorithm for charging.

"float chargers" are used for Sealed Lead Acid exit lighting. The batteries are charged continuously at a very low rate. the lifetime is usually reduced.

www.batteryuniversity.com shouldbe able to answer all of your questions.

 

There are 2 channels with 2 LED 'charging' indicators.

Each channel can charge (2 x 2.8V AAA) or (2 x 2.8V AA) or (1 x 9V size).

Regards,

Nandu.

No. Each channel can charge (1 x 2.8V AAA) or (1 x 2.8V AA) or (1 x 9V size).

 

@Audioguru again Actually if you look closer you can see that the unit can hold a total of four AA batteries (or four AAA's). However, I agree, the unit can handle a total of two 9V batteries, each on its own charge. As for the four batteries, the charger can handle 2 batteries each channel.