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Thank you for taking the time to provide feedback about our BK350 UPS. This uses a lead acid battery. See Complementary section of UPS Product page https://www.se.com/us/en/product/BK350/apc-backups-cs-350va-120v-6-nema-outlets-4-surge/ If you have questions at your earliest convenience please reach out to APCbySchneider to troubleshoot the issue further. We offer email and chat services through our support site and you may also contact us directly at 800-800-4272 option 4 or visit https://www.se.com/us/en/work/support/ and look for the chat icon available from 8AM-8PM EST.
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