Charging Samsung 25r batteries

[ajdudet]

I have had them on the charger for about an hour now and it said that one is still at 0 bars and the other is still at 1 bar. How long will it take to charge? I have heard it takes about 4 hours. Can I leave them to charge while I run to the store? or is that dangerous?

 

[Fantazmagoricl]

What charger are you using?
Are they new batteries? If new your looking at about 5-6 hours then around 4 hours to recharge. Personally I would never leave batteries on charge unattended, if you need to nip out for whatever reason i'd take the batteries off charge.

 

[Sgt.Rock]

Some chargers share the load between multiple sockets..If you'd like to complete the charge faster you may be able to speed things up by charging one at a time.

For example, The I4 Intellicharger shares available amperage. If you put batteries in slot 1 and 2 or 3 and 4 they share the available amperage...in 1 and 4 or 2 and 3 they do not.

 

[Mestapholes]

Charging depends in the available current of the charger and the state oft the battery.
An empty or almost empty battery can be charged much quicker than an almost full one.
That is because the batteries are charged at a constant current until the max voltage of the cell is reached. From that point in the current is reduced. That is why charging the first 80% is very fast, but the last 20% take forever...
And this is also the point were you charger is very important. Within the first 80% of charging the max possible current of your charger dominantes the time needed to charge your batteries...

 

[LuNar]

Mine usually take about 4 hours to charge. I use a nitecore charger and I charge my batteries over night. Even though I am well aware of the dangers I feel comfortable knowing that my charger will cut off giving the batteries power when they fully charged. I guess all it takes though is for the chip to slip up once and I'll have a bad day.

I still charge my batteries over night most of the time lol. I just work all day so they are going to have to be charged over night.

 

[Mooch]

Charging depends in the available current of the charger and the state oft the battery.
An empty or almost empty battery can be charged much quicker than an almost full one.
That is because the batteries are charged at a constant current until the max voltage off the cell is reached. From that point in the current is reduced. That is why charging the first 80% is very fast, but the last 20% take forever...
And this is also the point were you charger is very important. Weithin the first 80% oft charging the max possible current oft your charger dominantes the time needed to charge your batteries...

Even though the empty battery is being charged at the full charge rate, both empty batteries and almost full ones still have to go through the same slower constant-voltage stage before being fully charged. Charging an almost empty battery will always take longer than charging an almost full one. Much, much longer.

 

[Mestapholes]

Well yes. The overall time for charging a battery to full is if course longer for an empty battery than it is for a battery charged at 60%. That is not what I ment. To charge e.g. 40% capacity into an empty battery will be much quicker than to charge 40% into a battery with currently 60% charge.

 

[Mooch]

Well yes. The overall time for charging a battery to full is if course longer for an empty battery than it is for a battery charged at 60%. That is not what I ment. To charge e.g. 40% capacity into an empty battery will be much quicker than to charge 40% into a battery with currently 60% charge.

Agreed.