R/C Tech Forums

R/C Tech Forums (https://www.rctech.net/forum/)
-   Radio and Electronics (https://www.rctech.net/forum/radio-electronics-137/)
-   -   3s Lipo Question (https://www.rctech.net/forum/radio-electronics/1039922-3s-lipo-question.html)

MaX-D 03-29-2019 06:11 AM
3s Lipo Question
 
I have a 5000mah Onyx 3s lipo that I haven't used in 4 years. I use this in my crawler. I've kept it in storage mode at 3.8 volts per cell. I checked it last night and it was at 3.7 volts per cell. Is it still good? Or should I just get a new one? Thanks.

Billy Kelly 03-29-2019 06:29 AM
Should be fine.

MaX-D 03-29-2019 08:04 AM
Originally Posted by Billy Kelly (Post 15422165)
Should be fine.
Great! Thank you

billdelong 03-30-2019 07:00 AM
Really depends on the temperature you stored your battery, more than likely you will have lost a significant amount of capacity and the IR (internal resistance) will no longer be matched between the cells and cause significant imbalance toward the end of the discharge cycle. At the very least I would increase your LVC to the highest possible setting just to play it safe as LVC doesn't work on individual cells... take note of how far the cells are out of balance when you first place the pack on the charger after a discharge cycle.. if any individual cell is below 3.0V then I would replace the pack. More info here:
https://batteryuniversity.com/learn/...ased_batteries

MaX-D 03-30-2019 09:22 AM
Originally Posted by billdelong (Post 15422684)
Really depends on the temperature you stored your battery, more than likely you will have lost a significant amount of capacity and the IR (internal resistance) will no longer be matched between the cells and cause significant imbalance toward the end of the discharge cycle. At the very least I would increase your LVC to the highest possible setting just to play it safe as LVC doesn't work on individual cells... take note of how far the cells are out of balance when you first place the pack on the charger after a discharge cycle.. if any individual cell is below 3.0V then I would replace the pack. More info here:
https://batteryuniversity.com/learn/...ased_batteries
when I plugged in the battery to a battery tester, all three cells were at 3.70. It was stored in a lipo bag in a bedroom closet at 77 degrees. I will turn up the lvc as high as it will go on the castle Mamba Pro ESC that is in my crawler. Thanks for your help Bill, I appreciate it.

billdelong 03-31-2019 09:32 AM
3.7V/cell is good for storage, but be sure to check the voltage of each cell after LVC is triggered, that's the critical point to determine if it's time to replace the pack if any cells have dropped below 3.0V

MaX-D 03-31-2019 02:25 PM
Originally Posted by billdelong (Post 15423213)
3.7V/cell is good for storage, but be sure to check the voltage of each cell after LVC is triggered, that's the critical point to determine if it's time to replace the pack if any cells have dropped below 3.0V
This is good to know. Thank you!


All times are GMT -7. It is currently 02:41 PM.

Powered By: vBulletin v3.9.3.9 Patch Level 3
Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.