RCU Forums - View Single Post - Gas RC was a mistake !!!!

01-07-2012 | 12:26 PM

#140

dgholmes59

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From: Stephenville, TX

RE: Gas RC was a mistake !!!!

Quote:

ORIGINAL: levram1

Is it really bad to store fully charged li-po's? If so, what is the best way to discharge them? I have 3 that way.

You should discharge your LIPO battery to 40 to 50% even if stored for a week. I use the Thunder T6 multicharger, but there are many microprocessor based chargers that have a LIPO "storage mode." If the LIPO is discharged, it will charge it to the 50% and discharge them if above 50%. The cell voltage should be between 3.8 to 3.85 unloaded for storage. As you can see, you can also store them in a refrigerator to extend life further. I don't do this. Proper storage is to discharge/charge the battery to 50% and store in a cool environment. Heat and storing at full charge depletes the capacity pretty quickly.

You could also discharge the packs by flying and then charge to 50%.

You can use the Hyperion EOS sentry for measuring the cells. I use the Hyperion for all of my planes because it shows the % of charge left in the pack. One of my buddies crashed last week because his receiver battery was dead. $25 meter would have saved it.

http://www.hobbycom.com/ProductDetai...RY&click=2

From Batteryuniversity.com,
<table border="1" cellpadding="0" cellspacing="0" style="color: rgb(51, 51, 51); font-family: Arial, Helvetica, sans-serif; font-size: 12px; line-height: 18px; "> <tbody> <tr> <td style="width: 95px; background-color: rgb(224, 224, 224); "> Battery Temperature </td> <td style="width: 95px; background-color: rgb(224, 224, 224); "> Permanent capacity loss when
stored at 40% state-of-charge
(recommended storage charge level) </td> <td style="width: 95px; background-color: rgb(224, 224, 224); "> Permanent capacity loss when
stored at 100% state-of-charge
(typical user charge level) </td> </tr> <tr> <td style="width: 95px; background-color: rgb(238, 238, 238); "> 0°C 25°C 40°C 60°C </td> <td style="width: 240px; background-color: rgb(238, 238, 238); "> 2% loss in 1 year; 98% remaining 4% loss in 1 year; 96% remaining 15% loss in 1 year; 85% remaining 25% loss in 1 year 75%; remaining </td> <td style="width: 224px; background-color: rgb(238, 238, 238); "> 6% loss in 1 year; 94% remaining 20% loss in 1 year; 80% remaining 35% loss in 1 year; 65% remaining 40% loss in 3 months </td> </tr> </tbody></table>

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