Whenever I plug the battery source to the circuit, the fan doesn't function properly and the battery doesn't charge. But once I remove the battery source,it functions properly. I have tried detecting for shorts and blow outs but I can't find non.

 

Unless you tell us a lot more about "the circuit" I suspect we'll be as much in the dark as you are . Can you post a schematic of the circuit?

 

It's a rechargeable fan I'm trying to repair. Whenever I connect the battery terminals to the circuit and connect it to AC, the fan doesn't function properly unless I press and hold the on button. But when I remove the battery terminals and plug to AC, I functions properly. I have some pictures and video I took but it's too large to be uploaded here, except I can send it to ur mail.

 

I have some pictures and video I took but it's too large to be uploaded here, except I can send it to ur mail.

You can post your videos to youtube and then link to them here using the filmstrip icon.

You can edit your pictures for the web and post them here.

 

It's a rechargeable fan I'm trying to repair. Whenever I connect the battery terminals to the circuit and connect it to AC, the fan doesn't function properly unless I press and hold the on button. But when I remove the battery terminals and plug to AC, I functions properly. I have some pictures and video I took but it's too large to be uploaded here, except I can send it to ur mail.

What is the condition of the battery? If it's fully discharged or damaged, the charger may not be able to supply the requirements for running the fan.

 

What is the condition of the battery? If it's fully discharged or damaged, the charger may not be able to supply the requirements for running the fan.

Not fully discharged, about 3v in it. I suspect the charging circuit but don't know where to start from cos I've actually check almost all d components and they're working fine. Need an expert suggestion

 

Hello,

What kind of battery is used?
For lithium batteries, the 3 Volts is about the minimum allowed:
http://batteryuniversity.com/learn/article/types_of_lithium_ion

It can be that the charger has a safe limit build in, so it will not charge below a certain level.

Bertus

 

It

Hello,

What kind of battery is used?
For lithium batteries, the 3 Volts is about the minimum allowed:
http://batteryuniversity.com/learn/article/types_of_lithium_ion

It can be that the charger has a safe limit build in, so it will not charge below a certain level.

Bertus

It's a lead acid battery. 6v4.5ah

 

Hello,

For a 6 Volts lead acid battery, I would expect a discharged voltage of 3 X 1.4 = 4.2 Volts.:
http://batteryuniversity.com/learn/article/discharge_methods

It looks like one cell of the battery is shorted (broken).

Bertus

 

Hello,

For a 6 Volts lead acid battery, I would expect a discharged voltage of 3 X 1.4 = 4.2 Volts.:
http://batteryuniversity.com/learn/article/discharge_methods

It looks like one cell of the battery is shorted (broken).

Bertus

Thanks alot for ur quick responses. Really appreciate. I measure the voltage going to the battery terminals when connected to AC and it reads alitle above 7v, about 7.4v. Wondering if the circuit is OK with that.

 

Hello,

I would expect a value of 2.3 to 2.45 Volts per cell, wich would lead to 6.9 to 7.35 for your 3 cell battery.
See this page for more info on charging a lead acid battery:
http://batteryuniversity.com/learn/article/charging_the_lead_acid_battery

As said before, it looks like the battery is broken, one cell is shorted.

Bertus