I replaced the two 750mAh AAA batteries in my hair clipper with two same type but 1100mAh batteries and they wont charge. Is is because its higher capacity?

 

Why did you replace them? Maybe because they would no longer charge? Check the charger.

 

Why did you replace them? Maybe because they would no longer charge? Check the charger.

I replaced because its 10 years old and stops after 3 minutes after full charge.

 

I replaced because its 10 years old and stops 3 minutes after full charge. I can see the charging works as the led is blinking but only with the original batteries.

 

This is unusual. Rechargeable devices such as my electric drill and previous cell phone had higher capacity battery packs available for extended usage. As Keith said, check the charger.

 

This is unusual. Rechargeable devices such as my electric drill and previous cell phone had higher capacity battery packs available for extended usage. As Keith said, check the charger.

I replaced with the old ones again and still charging but not with the new batteries.

 

Are the replacement batteries of a reputable brand from a reputable source, or could they be fakes/rejects?
Can you measure the actual new battery voltages? If they're too low, the charger might take objection and refuse to charge them.

 

Are the replacement batteries of a reputable brand from a reputable source, or could they be fakes/rejects?
Can you measure the actual new battery voltages? If they're too low, the charger might take objection and refuse to charge them.

They are slightly used gp batteries. I charged them with desk charger and they have good voltage.

 

I replaced the two 750mAh AAA batteries in my hair clipper with two same type but 1100mAh batteries and they wont charge. Is is because its higher capacity?

And you made sure the replacement batteries are rechargeable? They won't overheat and explode or some other nasty thing? Do you know anything about your charger? if the higher rated batteries output more current than the charger can overcome.... that could explain why it isn't charging.

 

What type of batteries are they, NiCad of NiMh? Are you sure that the new ones are are of the same type as the old ones?

 

And you made sure the replacement batteries are rechargeable? They won't overheat and explode or some other nasty thing? Do you know anything about your charger? if the higher rated batteries output more current than the charger can overcome.... that could explain why it isn't charging.

Yes they ar rechargable.
How do I know current rating and why does it matter?

 

What type of batteries are they, NiCad of NiMh? Are you sure that the new ones are are of the same type as the old ones?

They are both NiMH

 

they have good voltage.

Did you measure the voltage open circuit or under load? The voltage on a poor battery will drop significantly under load.

 

Look at the website of GP batteries. They do not make 1100mAh AAA Ni-MH batteries so yours are probably fake ones.
GP Battery company is Chinese anyway. Buy name-brand batteries from a Western company instead.

 

Yes they ar rechargable.
How do I know current rating and why does it matter?

Here is a datasheet example for an AAA 2 1100mAh:



Your charger can't charge everything- it was _designed_ to charge a specific sized battery, based on the output of the battery it expects to charge. If it isn't able to handle a higher capacity battery, it's because it can't output enough current and voltage to overcome the battery (it's arm-wrestling with the battery to charge it).

 

Look at the website of GP batteries. They do not make 1100mAh AAA Ni-MH batteries so yours are probably fake ones.
GP Battery company is Chinese anyway. Buy name-brand batteries from a Western company instead.

@Audioguru While I respect you tremendously when it comes to electronics knowledge, I am irritated by the constant knock against Chinese electronics. China makes a lot of excellent electronic components. In fact, they supply the world with the majority of electronic components (out of Zhenzen). Many of the components out there, you can't even acquire unless you by from China, or you can't acquire them at a decent price. I source components from 70+ countries around the world, hundreds of thousands of parts a year. I find the Chinese parts in most cases to be excellent, reasonably priced, and they are big on service and ensuring you're happy with the purchase and quality of components. Displays, motors, semiconductors, passives, actives- everything you can think of, I purchase in quantity.

In the end, buyer beware, and must do due diligence, but painting Chinese electronics all with the same brush is unfair. IMHO.

 

Here is a datasheet example for an AAA 2 1100mAh:

View attachment 218426

Your charger can't charge everything- it was _designed_ to charge a specific sized battery, based on the output of the battery it expects to charge. If it isn't able to handle a higher capacity battery, it's because it can't output enough current and voltage to overcome the battery (it's arm-wrestling with the battery to charge it).

That explains it. Thank you.