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Battery Backup Replacement Batteries

The best backup batteries for your devices are the ones that last the longest and work when you need them. Whether you're looking for a replacement battery for your smoke alarm, security system, or other device, we've got you covered. Browse the top-ranked list of battery backup replacement batteries below along with associated reviews and opinions.

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  1. Ring - Quick Release Rechargeable Lithium-ion Battery for Select Devices

    SKU: J36CLVPSYP

    Backup...Works perfectly to have for backups or in addition in the cold weather!...Great backup battery...Recommended to have one or two available as backups.

    Product Description

    A rechargeable black and silver lithium-ion battery pack offering quick-release backup power for select Ring devices.
    See all Home Security Accessories
    Your price for this item is $34.99

  2. Renogy - 12V 50Ah Core Series Deep Cycle Lithium Iron Phosphate Battery

    SKU: J39HF8V2V4

    Product Description

    A rechargeable black lithium iron phosphate battery offering reliable 12V 50Ah deep cycle performance for various applications.
    See all Lithium Batteries
    Your price for this item is $199.99

  3. EcoFlow - DELTA PRO ULTRA 6000Wh Battery

    SKU: J36C7VZRKL

    I have been able to power my 700 sq. foot cabin entirely, with two solar arrays @ 3600 watts each and an EcoFlow dual-fuel backup generator if we encounter insufficient light (which isn't very often)!...

    Product Description

    A rechargeable black LiFePO4 battery backup providing 120 volts for home, emergency, camping, and RV use.
    See all Solar Generators & Power Banks
    Your price for this item is $3,299.00

  4. EcoFlow - DELTA 3 Extra Battery

    SKU: J36C7V49FS

    Product Description

    A modular silver battery accessory that expands storage and runtime for DELTA 3 series portable power stations.
    See all Solar Generators & Power Banks
    Your price for this item is $557.99
    Save $41
    The previous price was $599.00
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In-store pricing may vary. Prices and offers are subject to change. © 2026 Best Buy. All rights reserved. BEST BUY, the BEST BUY logo, the tag design, and MY BEST BUY are trademarks of Best Buy and its affiliated companies.