[NSRCA-discussion] Battery discharge/storage question

[Atwood, Mark]

Okay, I'll bite. Why don't you want to top off the charge? I know a lot of people who insist on doing this even if they just flew the day before.

Sent from my average intelligence  phone


On May 8, 2013, at 1:44 PM, "Scott McHarg" <scmcharg at gmail.com<mailto:scmcharg at gmail.com>> wrote:

I haven't seen any issues with a battery left a full charge for a week but I wouldn't recommend longer at full charge.  Just make sure that you DO NOT top off the charge prior to flying.  I have started doing what Keith does as well which eliminates all concerns.  The worst part is having to wait at the field while you bring that battery back up to 50%.  Last one out has to lock the gates.


On Wed, May 8, 2013 at 11:23 AM, Keith Hoard <klhoard at hotmail.com<mailto:klhoard at hotmail.com>> wrote:
I take my batts to the field at 50% and leave the field at 50% charge. If I can't do that, then I discharge when I get home. My batts seem to last a long time.

The (dis)charger is supposed to get hot, that is where the energy from the battery is going - into the heat sink. That's Ok, my PL 8 gets hot too.

The PL8 can only discharge 100 watts by itself, but can do much higher if it is using "regenerative" discharge - dumping your LiPo's charge back into a lead acid battery. I don't know if the 10X has that capability or not.  Otherwise I'd just keep using the low discharge rate, or plan your flying day to end with a storage charge.

Wow, that was a lot of typing to do on a phone!!

Sent from my iPhone

On May 8, 2013, at 11:15, "Bob Kane" <getterflash at yahoo.com<mailto:getterflash at yahoo.com>> wrote:

I have had to abort a couple of planned flying sessions so far this spring due to weather.  I have read that lipos should not be left at full charge for any significant length of time. So what is a significant length of time?

Hours?  Days? Weeks?

My Turnigy 10XS charger has a discharge/storage mode, but the maximum discharge current is 1 amp. It takes a couple of hours to bring a 10S pack down to storage level, and the charger gets pretty warm(!) during the discharge.  Up to now I have only worried about discharging the pack for long term storage.

If leaving the cells fully charged for more than a day or so is bad, I am considering building a dedicated discharger, there are some pretty simple yet effective designs on RCU.

Bob Kane
getterflash at yahoo.com<mailto:getterflash at yahoo.com>
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--
Scott A. McHarg
Sr. Systems Engineer - Infrastructure
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