Charger and Battery Question
 

I have a venom pro charger and today I charged my 7.4 6000mah battery for the first time as a balance charge. The issue I was having is it wouldn't complete the charge for some reason? Ex: it took 110 min charging at 40V but didn't complete, any ideas? Hope I made my question clear.

By the way I setup my charge at 5Amps 7.4 volt 2C before I started charge.

how much does your charger say it put into it? it will never put exactly 6000mah into the battery ever, because if it did that means the battery is ruined, because it means its drained below the voltage it needs to be at minimum to work :nod: if you drain that battery as much as possible (running to voltage cutoff or discharging on the charger) the charger should still only put a maximum of ill say about 4500-5250mah (is my guess i run 5000mah lipos) hope this helps :D

Some charges have an adjustable safety timer on them. Since you said you balanced charged the pack you might have "timed out" since balance charging take alot longer to complete. Check to see if your charger has a timer. Balance charging a 6000mah pack will take well over an hour.

With a venom pro charger, yes you are correct, it will probably take far more than an hour. However this is not true for all chargers. I can balance charge 6000mAh batteries in less than 15 minutes with my iCharger 208b. :)

Direct your response to the member who asked the question in the first place. I could care less what charger you have nor do I need a lesson from you on lipo charging.:flaming:

oh is that how forums work? everyone just responds to the OP with no response to other responses. I see now. Thank you for the enlightenment. :rolleyes:

You made a general statement, which although true for some chargers is most definitely not true for all. I was simply clarifying that fact and used my own charger as an example.

Thanks for responding and sorry for late response. The voltage was stuck 41, and wouldn't go past that point. I was watching it at the 118 min point. So not quite sure how long I should have waited before I stopped it myself. Was little afraid that something would go wrong if I didn't stop it.

A general rule for timing out is 120 minutes. I have/had 5 different charges w/timeout settings and all were 2 hrs.

Hope this helps.

It shouldn't be timing out with a 5amp charge going into a 6000mah lipo.

Couple things aren't clear. What is the 40V? Do you mean 4.0 volts?
And not clear on the "5amp 7.4 volt 2C". 2C charge would be 12 amps on a 6000mah lipo. Did you mean 2S?

clearing things UP
 

LanceBuku, my thoughts exactly Don't think even the Venom pro can get to 2c on a 6000 mAh battery. I had no clue what the 40v meant and 2c sounded to high. There are still a lot of Lipo's that charge at 1c.
Some one mentioned earlier about low voltage. Very important that you DO NOT go below 3.0 volts per cell if it is a 2 cell that is 6.0v and if a 3 cell 9.0v. I would highly suggest you become familiar with characteristics of Lipo batteries as they are an excellent tool although, if your Garage or House were to catch on fire, bottom line understanding a few simple perimeters should keep you safe and trouble free.
I can claim one trashed 3 cell to my collection, swelling no fire or explosion. took bout 4 seconds till I realized I was connect to a Nimh instead of the ESC (beware of those bullet connectors U see on some Turnigy's) due to a miss connection.

clearing things UP
 

LanceBuku, my thoughts exactly, Don't think even the Venom pro can get to 2c on a 6000 mAh battery. I had no clue what the 40v meant and 2c sounded to high. There are still a lot of Lipo's that charge at 1c.
Some one mentioned earlier about low voltage. Very important that you DO NOT go below 3.0 volts per cell if it is a 2 cell that is 6.0v and if a 3 cell 9.0v. I would highly suggest you become familiar with characteristics of Lipo batteries as they are an excellent tool although, if your Garage or House were to catch on fire, bottom line understanding a few simple perimeters should keep you safe and trouble free.
I can claim one trashed 3 cell to my collection, swelling no fire or explosion. took bout 4 seconds till I realized I was connected positive to a negative on a Nimh instead of the ESC (beware of those bullet connectors U see on some Turnigy's).

Sorry for confusing, let me see if I can explain better. The 40V was what the voltage was at while it was at 118 min charge mark. Local hobby shop told me to just leave it, it should climb a little more then complete. I was waiting a little more but the voltage kept going from 40 V to 39 V it didn't climb at all. So I got a little worried and stopped it myself.

As for the "5 amp 7.4 volt 2 S". is what I set my charger at before I started the charge.

My new Zippy and Turnigy hardcase lipos came with those 4mm connectors. After I cut them off to install Deans I noticed that they can plug into each other which is what happened to you. I can't believe they think that's a safe connector.

Still not clear on the 40 V. Should be more like 4.0 V. Also found out the Venom Pro won't charge a lipo beyond 4.1 volts per cell. So when you said the voltage wouldn't go above 41 that makes more sense that it was 4.1 volts.

I charge my 6000mah 2s lipos at the same rate as you and it takes about an hour. With the Venom Pro it should be about the same.
How long have you had the lipos? It could be a bad cell even if their new.

Its Brand New