I just recently purchased a 6500mah 7.4v 150c lipo.I have a duratrax onyx 230 charger with a deans banana plug lead.After i programmed my charger for the lipo.I went to start the charge and my charger started beeping and when i read the screen on the charger it said Battery Volt Error.So i decided to go to the troubleshooting section of my charger manual.it told me that the battery had been discharged to too low of a voltage and is no longer suitable for use.???? Discharged? I just got this battery and was just trying to charge it? So i got out a voltmeter and the reading was 4.1v.Now if maxamps makes there packs fresh and goes through a multipoint inspection.Why would this be? Hmmmmmm! Well,i decided to send the pack back and there going to check it out.Im sure they will do good by it.But now this pack has cost me up around 173.00.Because of the 20.00 to ship it back to them.Hopefully ill get reimbursed for the shipping back to them.When all is said and done i hope this lipo is really worth it!