07-03-2020, 08:11 PM | #1 |
Pebble Pounder Join Date: Jan 2020 Location: Northern Utah
Posts: 118
| Battery Voltage
I usually run my 2 or 3s batteries in my crawler till they no longer run the truck is this bad for the battery? Sounds stupid I know but an airplane guy said to get a battery alarm when the battery falls below (?) voltage the alarm goes off- I told him the crawler don't fall from the sky...usually-my 3s went down to 8.78 before it quit- any ideas or suggestions? Thanks in advance- Vic in SoCal
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07-03-2020, 08:23 PM | #2 |
RCC Addict Join Date: Aug 2017 Location: Fredericksburg, VA
Posts: 1,912
| Re: Battery Voltage
You did not specify what truck, ESC or batteries you're running but it sounds like your ESC is hitting low voltage cut off. Every modern ESC that can use LiPo batteries includes a low voltage cutoff feature to protect the battery from over discharging. It sounds like you are just running your batteries until you hit the cutoff and at 8.78v the cutoff is set a bit too low.
Last edited by Inspector86; 07-04-2020 at 05:32 PM. |
07-03-2020, 08:43 PM | #3 |
Pebble Pounder Join Date: Jan 2018 Location: Northeast Iowa
Posts: 131
| Re: Battery Voltage
3.2v per cell is what i run down to. so for 3s 9.6v is the minimum id recommended Sent from my SM-G965U using Tapatalk |
07-03-2020, 08:46 PM | #4 |
Quarry Creeper Join Date: Dec 2016 Location: Cawston, British Columbia, Canada
Posts: 478
| Re: Battery Voltage
If you're down at 8.78V on a 3s you're letting the battery get too low. Minimum voltage for each cell needs to be 3V+ which would be 9V+ total. You have at least 1 cell, or more, below minimum voltage. Most people like to set their Lipo cutoff at about 3.3V per cell, so 9.9V for your 3s. It would seem your ESC battery cutoff is too low or nonexistent. A battery alarm, as Inspector86 suggests, would be a good investment before you totally destroy your battery(s). Relatively inexpensive, around $5, and most are adjustable to set your individual cell voltage to a safe level. The one you're looking for plugs in to the balance plug on the battery.
Last edited by nightcrawler48; 07-03-2020 at 09:12 PM. |
07-04-2020, 09:04 AM | #5 |
Quarry Creeper Join Date: May 2017 Location: Devon
Posts: 442
| Re: Battery Voltage
What ESC? Sent from my Pixel 3 using Tapatalk |
07-04-2020, 02:14 PM | #6 |
Newbie Join Date: Jul 2020 Location: Antarctica
Posts: 19
| Re: Battery Voltage
LiPo batteries are very delicate. You really, really don't want to run them down below their minimum voltage, and preferably not very close to their minimum. At 3.2V per cell minimum, you would want to stop at 9.6V. Better ESC's will shut down the truck when reaching some pre-set or programmable minimum value (again, typically 3.2V as a default per cell). Likewise, you really, really don't want to over-charge your batteries (max is usually 4.2V per cell for normal LiPo), but your charger hopefully knows about that. Also: Don't leave your batteries fully charged for very long. Ideally, you would charge up and run down the battery the same day. If you do store your batteries for a long time, then you should condition them to about half their full voltage. Don't leave them fully charged or empty. Last edited by Zondar; 07-05-2020 at 08:23 AM. Reason: Corrected a voltage. |
07-04-2020, 02:48 PM | #7 | ||
Quarry Creeper Join Date: Dec 2016 Location: Cawston, British Columbia, Canada
Posts: 478
| Re: Battery Voltage Quote:
Quote:
Proper battery maintenance = battery longevity | ||
07-04-2020, 08:31 PM | #8 |
Pebble Pounder Join Date: Jan 2020 Location: Northern Utah
Posts: 118
| Re: Battery Voltage
this esc is an old hobbywing (writing wore off a while ago) brushless on an Ax10 I believe now on my TRx4 I have a hobbywing 1080 esc- the same batteries are 3s lipo I will take everyone's recommendation to set the esc shut off at 9.9 / 9.6v- thanks for the info- now to check the manual on how to do this |
07-04-2020, 09:56 PM | #9 | |
Quarry Creeper Join Date: Dec 2016 Location: Cawston, British Columbia, Canada
Posts: 478
| Re: Battery Voltage Quote:
Not too sure where to find it now but a few years ago there was a post asking members to list the settings they were using for all the program items. For Cutoff Voltage - Auto (Medium) and Auto (High) were about a 50/50 split. | |
07-05-2020, 08:22 AM | #10 |
Newbie Join Date: Jul 2020 Location: Antarctica
Posts: 19
| Re: Battery Voltage |
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