Charging problem - Page 3 - RC-Monster Forums

MetalMan · 06.19.2007, 12:50 PM

You can use them three days later and they will still be almost fully charged, and there won't be a power difference after three days. However, it's best to keep Lipos at about 3.8v/cell when not in use (storage), so keep that in mind.

rchippie · 02:12 PM

Quote:

Originally Posted by MetalMan

You can use them three days later and they will still be almost fully charged, and there won't be a power difference after three days. However, it's best to keep Lipos at about 3.8v/cell when not in use (storage), so keep that in mind.

Im new to this lipo stuff how can tell if each cell is 3.8 & will it hurt if i store them higher than 3.8 ?. I'm assuming i can just measure the pack voltage as a hole ?.

I just figured out i can use the balanceing tab to measure each indaviduel cell.

BrianG · 06.19.2007, 01:12 PM

I usually just run my vehicle for about 1/3 of the normal runtime. That typically sets the voltage right around 3.7-3.9v per cell. Yes, you can measure the pack as a whole and divide by the number of cells, but this assumes the pack is balanced.

rchippie · 06.19.2007, 01:14 PM

Quote:

Originally Posted by BrianG

I usually just run my vehicle for about 1/3 of the normal runtime. That typically sets the voltage right around 3.7-3.9v per cell. Yes, you can measure the pack as a whole and divide by the number of cells, but this assumes the pack is balanced.

Does it hurt if you store them with more than 3.8 per cell ?.

BrianG · 06.19.2007, 01:17 PM

I can't remember exactly what happens when you store over 3.8v, but I do know it is better for the cell. I don't think it will explode or anything.

rchippie · 02:07 PM

Quote:

Originally Posted by BrianG

I can't remember exactly what happens when you store over 3.8v, but I do know it is better for the cell. I don't think it will explode or anything.

So after your last run of the day what is your rutine for storing them ?.

jnev · 06.19.2007, 01:45 PM

Is it bad if they are stored for a couple days with no charge? I ask because I am waiting for my charger in the mail, and surprisingly, the battery came fully charged, so I ran it.

jhautz · 06.19.2007, 10:52 PM

Quote:

Originally Posted by ***RC***

Is it bad if they are stored for a couple days with no charge? I ask because I am waiting for my charger in the mail, and surprisingly, the battery came fully charged, so I ran it.

I wouldnt leave it for longer than you need to. I forgot to throw a little charge in one of mine once and it was fine a few weeks later. But it wasnt 3.0v/cell to start with either. Its best to store them with a little voltage in them. but you will probably be ok as long as you didnt run it down to far.

jnev · 06.19.2007, 10:21 PM

Anyone know? Sorry for the thread hijack...

BrianG · 06.19.2007, 10:43 PM

A couple of days is ok. A week, maybe. Longer; run it down to 3.8v/cell.

jnev · 06.19.2007, 11:28 PM

I ran it down until about 12.5 volts. I hope the charger come within the next two days or so, so I don't have to start freaking out about the battery.

jhautz · 06.22.2007, 04:52 PM

Lipo chargers dont use the peak meathod for charging. They use a Constant Current / Constant Voltage method.

They basically put out the current that you set based on 1C of the mah of the pack and when the correct votage is reached (16.8v in this case) they switch to a constant voltage output. Where the current is lowered slowly to keep the cell at the 16.8v untill it wont take any more charge.

If yours shut down early there may be some sort of safety set on the charger that limits the mah that it will put into a pack or will only charge for a certain amount of time as a safety.

WHat charger are you using?

rchippie · 05:04 PM

Quote:

Originally Posted by jhautz

Lipo chargers dont use the peak meathod for charging. They use a Constant Current / Constant Voltage method.

They basically put out the current that you set based on 1C of the mah of the pack and when the correct votage is reached (16.8v in this case) they switch to a constant voltage output. Where the current is lowered slowly to keep the cell at the 16.8v untill it wont take any more charge.

If yours shut down early there may be some sort of safety set on the charger that limits the mah that it will put into a pack or will only charge for a certain amount of time as a safety.

WHat charger are you using?

Im using a HYPERION EOS5Idp charger. Also i'm balance charging, & was wondering when the charge cycle ends. If the balance lights are still on do you stand alone balance them ?.

jhautz · 06.22.2007, 05:12 PM

I cant really help you with that charger. I dont know anything about it. Maybee someone who does will chime in here.

As for balancing, Its my understanding that its best to balance at a somewhat dicharged voltage level rather than a full charge. Something about it being more accurate, but I wouldnt think it would matter that much. I certainly dont this you will hurt anything to let it continue to balance after the full charge.

rchippie · 06.22.2007, 05:18 PM

Quote:

Originally Posted by jhautz

I cant really help you with that charger. I dont know anything about it. Maybee someone who does will chime in here.

As for balancing, Its my understanding that its best to balance at a somewhat dicharged voltage level rather than a full charge. Something about it being more accurate, but I wouldnt think it would matter that much. I certainly dont this you will hurt anything to let it continue to balance after the full charge.

I balanced them before i put them on the charger. I also balance charge them, & they change a little. So i've read somewere you should balance them again after there done & before use . True or false ?.