Powerlab8 Lipo charging questions
Hello, I want to charge a single 6s1p battery pack and am unsure of some of the charge options in the software. Charger is a powerlab 8.
The batteries are Turnigy 5000Mah, 6s1p, 2c charge, 20c discharge.
Charge Amps: , Am I better off setting it to 2c? Or should I set it to 10 amps?
C/? Termination: What is this exactly, what should I set this to?
Cold Weather: It is 70-85 degrees in my charging area. Do I need to set this? It defaults to 50F. Should I set this to none or leave it at 50F?
Discharge Voltage: I read where you should not discharge a Lipo below 3.65V. Why does it default to 3.30V? Should I change this?
I just got these batteries new. Is there any reason to discharge them before I charge them?
Here is an optional question if someone has the time to help me out.
This is a parallel charging question. I want to charge 4 batteries in parallel using a board.
Here is my power supply.
Output Power: 600w
Output Voltage: 17v
Output Current: 0-36A
When charging 4 of these 6s1p batteries using the power supply in the link. What are the best charge settings I should use?
Comments below in red...
Thanks for the reply, I have read it some days ago and charged my batteries.
I know exactly what you mean when you say that some of the charging methods are opinion based. It is similar to 2500 mile oil changes. I used to do 2500 mile oil changes in the past then I read where Europe does 15,000 mile oil changes and read the controversey on the internet
Now i do 10,000-15,000 mile oil changes for years and my cars never ran better. People will still argue that you need 2500 miles or 3 months, but from my research, it seems that that you can probably go 30,000 miles or 2-5 years on a synthetic oil change and probably be OK. However, I stay between 10,000-15,000 and try and do it at least every two years. But I seem to get lazy as I keep pushing the oil changes longer and my cars seem to run just as smooth as they ever did. My cars have over 150K miles also.
I have a C/? termination question. I have set my C/? termination to C/3 I blieve so that the charge stops as fast as possible. But this only gets me to around 4.07 volts instead of 4.1 volts.
I was wondering if I can set my voltage to around 4.13 volts and keep the C/3 setting so that it will stop the charge process sooner and this should give me roughly around the 4.10 volts I want.
Is there any harm in doing this? I don't really care if my voltage is 4.09 or 4.11 volts, I just want it to charge as quickly as possible to around 4.1 volts and then stop.
Another question is there anyway to set the C/? termination on the charger itself, or do you need to use the software? I see no option to change it on the charger itself.
Because you are not requiring the cells be at 4.2v that gives you some flexibility. You can set the voltage to overshoot your target anticiplating the fallback. As I recall there were some older chargers that did this, charging the cells past 4.2v and letting the normal voltage sag bring the cells back 4.2v.
I'm not a fan of over charging LiPos and would not recommend that approach. But targeting 4.13, for an end result of 4.1v os perfectly safe. However, do note that the voltage sag varies by pack quality and age. The better and fresher the packs, the less the voltage will sag. So you may find that you are not aways hitting 4.1 over time.
As another datapoint I did some tests a while back to see how fast I could charge a 3300 6s pack without changing the charge current. Below are my results which you might find interesting. Also note that i changed the balance deadband and balance set point. Something you might want to play with. Unfortunately you will need the PC interface to do so.
Starting from storage charge 3.84v
V 4.195,200,201, 201,201,196
Balance deadband 2mv
Balance set point -1mv
V 4.192, 196, 192,196,192,192
Balance deadband 5mv
Balance set point -2mv
V 4.182, 187,184,188,187,182
Balance deadband 2mv
Balance set point -1mv
In the end, the default settings are going to give the most predictable results time after time in more scenarios. But you can definitely achieve a faster charge time if you are willing to give up a small amount of 100% fully charged cells. Some insist on thier cells ending at 4.2v. As I said above, the 4.1v target frees you up a little. Enjoy your freedom.
If your LiPolys are well matched and require very little if any balancing then setting the Blanacing to start later in the charge will trim some time off. I have one Preset where Blancing starts at 4.1 V per cell that I use for my really good 45 to 65C discharge 10-12C charge capable Lipolys and at 5C charge rates it knows a few minutes off even using the C/10 termination.
The Power Labs are extremely versatile and one can do some very serious tweaking.
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