<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Wow, spot on Alex. It's breath of fresh air to hear correct info about Li batteries. Far too much misinformation has flooded the web.<div class=""><br class=""></div><div class="">Just adding a note about temperature. LFP type batteries can be discharged with cell temperatures down to -5°F and will not be harmed if exposed in storage to as low as -40°F for short duration. We recommend all long term storage be at about 50% SoC.<div class=""><div class="">
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<div><br class=""><div class="">On Jan 19, 2022, at 9:58 AM, Alex MeVay <<a href="mailto:alex@sunforgellc.com" class="">alex@sunforgellc.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">Generally, storage or use at cold temperatures shouldn't be an issue,<br class="">as long as the battery can still deliver enough power to operate the<br class="">tool effectively.<br class=""><br class="">Charging though...at cold temperatures, ion mobility goes down. If<br class="">the battery is charged too fast, the lithium ions can't make it into<br class="">the graphite anode fast enough and they start to plate out as metallic<br class="">lithium. At best, this results in a permanent reduction in capacity.<br class="">Next worst from there, the lithium metal can create an internal soft<br class="">short, immediately or at a later point in time, resulting in high<br class="">self-discharge or a dead cell. Worst case, it turns into a hard short<br class="">and a fire.<br class=""><br class="">In theory, the BMS or charger should prevent charging too fast or too<br class="">cold, but who knows if an edge-case like this is actually implemented<br class="">correctly on any particular battery system. Be careful charging!<br class=""><br class="">Alex MeVay<br class=""><br class="">Genasun * Blue Sky Energy * <a href="http://sunforgellc.com" class="">http://sunforgellc.com</a><br class="">_______________________________________________<br class=""></div></div></div></div></div></body></html>