Self-discharge (No Load) is typically around 1–2%, depending on temperature and pack chemistry. Higher temperatures will accelerate this, but it generally caps out at around 3-4% under worst-case conditions, usually because the BMS shuts down the battery if temperatures get too high.
The bigger concern is prolonged exposure to temperatures above 45 °C. At those temperatures, you will begin to lose overall cycle life, which can cause pack swelling, even if the batteries are just sitting in storage. Based on current observations, that loss can be up to roughly 2% of overall cycle life per year when exposed to those elevated temperatures. Unfortunately, there isn’t much comprehensive testing available yet. Right now, we are conducting cold-weather testing to better understand how these batteries are affected by low temperatures and what kind of long-term damage cold exposure may cause. We’re seeing some preliminary results, but complete data will likely take another 5–10 years to fully develop. We are currently observing that LFP batteries start to degrade at temperatures below about –5 °C. The impact seems to average around 1% additional degradation per year in both cycle life and capacity at those temperatures. Prolonged exposure to -20 °C and below, you can also see swelling from electrolyte freezing. One thing that is becoming increasingly clear through this testing is that cell manufacturers’ published data often does not fully reflect real-world performance, particularly in long-term environmental testing. *Steve Higgins* *⋅* *Technical Services Manager* *t* +1.902.597.4020 *m* +1.206.790.5840 *f* +1.902.597.8447 *e* [email protected] ------------------------------ CONFIDENTIALITY: The information transmitted herein is intended only for the addressee and may contain confidential, proprietary and/or privileged material. Any unauthorized review, distribution or other use of or the taking of any action in reliance upon this information is prohibited. If you receive this email in error, please contact the sender and delete or destroy this message and all copies. ------------------------------ On Wed, Mar 11, 2026 at 10:20 AM Chris Schaefer <[email protected]> wrote: > Steve, what is the self discharge on Lithium Iron Phosphate (LFP)? > > Christopher > > On Wed, Mar 11, 2026 at 11:26 AM Steve Higgins via RE-wrenches < > [email protected]> wrote: > >> Typically, AGMs self-discharge around 2-3% per month at 25 °C. Higher >> temps accelerate this, lower temps slow it down. >> >> Flooded Lead Acid is 8-12%, depending on plate sizes and the health of >> cells. >> >> >> *Steve Higgins* *⋅* *Technical Services Manager* >> *t* +1.902.597.4020 *m* +1.206.790.5840 >> *f* +1.902.597.8447 *e* [email protected] >> ------------------------------ >> CONFIDENTIALITY: The information transmitted herein is intended only for >> the addressee and may contain confidential, proprietary and/or privileged >> material. Any unauthorized review, distribution or other use of or the >> taking of any action in reliance upon this information is prohibited. If >> you receive this email in error, please contact the sender and delete or >> destroy this message and all copies. >> ------------------------------ >> >> >> >> >> On Wed, Mar 11, 2026 at 8:13 AM Mark Frye via RE-wrenches < >> [email protected]> wrote: >> >>> Do AGM discharge 10% a month? >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> Pay optional member dues here: http://re-wrenches.org >>> >>> List Address: [email protected] >>> >>> Change listserver email address & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> >>> There are two list archives for searching. When one doesn't work, try >>> the other: >>> https://www.mail-archive.com/[email protected]/ >>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>> >>> List rules & etiquette: >>> http://www.re-wrenches.org/etiquette.htm >>> >>> Check out or update participant bios: >>> http://www.members.re-wrenches.org >>> >>> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/[email protected]/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> >> > > -- > > Chris Schaefer’s > > > *Tel 585-229-2083 or Cell 585-748-1870 * > *5115 S Hill Road ~ Canandaigua New York 14424**www.solarandwindfx.com > <http://www.solarandwindfx.com> ~ E-mail: [email protected] > <[email protected]>* > > > Thomas Jefferson, the author of our great Constitution, once said, > "democracy" will cease to exist when you take away from those who are > willing to work and give to those who would not." >
_______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/[email protected]/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
