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The Back UPS model BN450MNW is designed as not user replaceable battery. Once the battery needs to be replaced, it will need to replace the internal battery. You may check our website for purchased another new unit or if the unit is still under warranty, Please reach out to us directly so we can address this issue and provide you with the support you need. You may reach us at 800-800-4272 or via chat service through our support site - https://www.apc.com/us/en/support/. Support is available Monday – Friday, 8am – 8pm EST
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