<div dir="ltr"><div class="gmail_quote gmail_quote_container"><div>Do you store your batteries at room temperature? What degradation do you see when it's not at room temperature? On large BESS containers, I get a long term storage document from the OEM and the only major item in there is ambient temperature. You get increasing degradation with colder temperatures. It becomes a major discussion point on projects as we have to get temp generators to power the HVAC, or schedule BESS deliveries towards the end of the project, or store the BESS containers in a climate controlled environment. </div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
Date: Sat, 3 Jan 2026 09:15:19 -0700<br>
From: Starlight <<a href="mailto:larry@starlightsolar.com" target="_blank">larry@starlightsolar.com</a>><br>
To: RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>><br>
Subject: Re: [RE-wrenches] LFP storage<br>
Message-ID: <<a href="mailto:E86894B3-BA28-4BBA-9D87-01B57BE9AACD@starlightsolar.com" target="_blank">E86894B3-BA28-4BBA-9D87-01B57BE9AACD@starlightsolar.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Hello Jay,<br>
<br>
We have been in the Li-ion battery business for 13 years. I can share our experience with our LiFeBlue brand and also with GBS cells. <br>
<br>
In our shop we have LFP test cells that have been sitting disconnected for over 7 years. Each time we test these, the capacity loss is negligible. Some are stored at 50%, some at 100% SoC. There are other factors I wont get into but the longevity is remarkable.<br>
<br>
Our recommend storage method for periods over 30 days is to establish about a 50% SoC (about 13.2V) and disconnect the battery. Make sure it?s full disconnected as a small load can drain over 4kWh per month. When ready for use, recharge fully for cell balancing and to calibrate the internal SoC meter.<br>
<br>
Some customers use batteries in a UPS configuration for radio systems backup. The voltage is fixed at 14.2V. The cells are only discharged during a power outage. Some of these systems are over a decade old.<br>
<br>
Our RV and Marine batteries are often left on float charge of 13.8V while being stored for many months. The downside of this is if the charger malfunctions you might over-discharge the battery. This could be difficult to recover if left in a full discharge state. <br>
<br>
If you?re going to disconnect the battery, be sure to check it occasionally as some batteries have a high self discharge rate. Our brand has a hibernate mode after 15 days of non use. Current drops to 5uA.<br>
<br>
Let me know if I covered it all. <br>
<br>
Thank you,<br>
<br>
Larry Crutcher<br>
Starlight Power Systems<br>
<br><br>
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