{"id":47305,"date":"2022-11-14T21:23:04","date_gmt":"2022-11-14T21:23:04","guid":{"rendered":"https:\/\/freeflysystems.com\/?post_type=kb_article&#038;p=47305"},"modified":"2022-11-14T21:23:04","modified_gmt":"2022-11-14T21:23:04","slug":"sb002-super-light-battery-sl8-battery-incident-14-nov-2022-follow-up","status":"publish","type":"kb_article","link":"https:\/\/freeflysystems.com\/knowledge-base\/sb002-super-light-battery-sl8-battery-incident-14-nov-2022-follow-up","title":{"rendered":"SB002 Super Light Battery &#8211; SL8 Battery Incident &#8211; 14 Nov 2022 Follow-Up"},"content":{"rendered":"<p><strong>Date Released:<\/strong><span style=\"font-weight: 400;\"> November 14th, 2022<\/span><\/p>\n<p><strong>Subject:<\/strong><span style=\"font-weight: 400;\"> SL8 Battery Incident<\/span><\/p>\n<p><strong>Effectivity:<\/strong><span style=\"font-weight: 400;\"> Immediate<\/span><\/p>\n<p><strong>Required Action:<\/strong><span style=\"font-weight: 400;\">\u00a0 None at this time &#8211; Alert<\/span><\/p>\n<p><strong>INTRODUCTION<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">This is a follow-up to our 8 Nov Service Bulletin regarding an SL8 battery fire at our East Coast office. We have not yet determined the root cause, but our focus is narrowing. Below we describe some of our testing to date.\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">As of now, there are no required actions and customers are advised to continue normal SL4 \/ SL8 \/ Astro operations with extra attention paid to any battery faults.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><strong>DISCUSSION<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">In the previous service bulletin, we mentioned four areas of investigation: overvoltage leading to critical component failure, cell balance circuit failure, manufacturing defect in the PBCA, and random component failure.\u00a0 Here\u2019s where are at on each possible failure mechanism:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Overvoltage incident<\/span>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">In bench testing, it\u2019s possible to create similar damage to what we experienced by forcing significant overvoltage conditions.\u00a0 However, we have not yet been able to produce these overvoltage conditions in a practical setting.\u00a0 We continue to investigate here.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">We have modified a few SL8 batteries to give them high speed voltage logging capability and we are using these along with bench testing to find any conditions resulting in an overvoltage.\u00a0\u00a0<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cell balance circuit failure or balance wire short circuit<\/span>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">In our testing it has been extremely difficult to intentionally create a short in the balancing circuit which would cause a fire.\u00a0\u00a0<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Manufacturing error or defect in a PCBA<\/span>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">We are reviewing specific processes with\u00a0 the PCBA manufacturer.<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Random and catastrophic failure of key component (TVS Diode, Regulator, etc)<\/span>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">We have found no evidence of counterfeit parts or defective batches of parts.\u00a0\u00a0<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">In addition to our testing, we have completed an internal and external engineering review of the BMS circuit design and the teams found no errors or design flaws to explain the incident.\u00a0 We also reviewed manufacturing records and related flight logs, but found nothing out of the ordinary.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><strong>RECOMMENDATION<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">At this time, there is no immediate action required from our customers.\u00a0 If you have any abnormal battery behavior during use, charging, or storage, please contact Freefly Support.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Next Steps: Freefly will provide an update to this Service Bulletin by 11\/21. We will follow up with all SL8 \/ SL4 \/ Astro customers on our investigation findings and all required customer actions that come from our investigation.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For Service Information Contact Freefly Support: <\/span><span style=\"font-weight: 400;\">Support@freeflysystems.com<\/span> <a href=\"https:\/\/freeflysystems.com\/support\"><span style=\"font-weight: 400;\">https:\/\/freeflysystems.com\/support<\/span><\/a><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n","protected":false},"template":"","class_list":["post-47305","kb_article","type-kb_article","status-publish","hentry","support_category-power-systems","support_category-power-systems-service-bulletins"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.7 (Yoast SEO v26.0) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>SB002 Super Light Battery - SL8 Battery Incident - 14 Nov 2022 Follow-Up - Freefly Systems<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/freeflysystems.com\/knowledge-base\/sb002-super-light-battery-sl8-battery-incident-14-nov-2022-follow-up\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SB002 Super Light Battery - SL8 Battery Incident - 14 Nov 2022 Follow-Up\" \/>\n<meta property=\"og:description\" content=\"Date Released: November 14th, 2022 Subject: SL8 Battery Incident Effectivity: Immediate Required Action:\u00a0 None at this time &#8211; Alert INTRODUCTION This is a follow-up to our 8 Nov Service Bulletin regarding an SL8 battery fire at our East Coast office. 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