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Best Buy customers often prefer the following products when searching for 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. Best Buy essentials™ - AA Batteries (8-Pack) - Alt_View_Zoom_11

    Product Description

    They’re just batteries – until your remote control is dead. The Best Buy essentials BE-BAA8PK AA Batteries (8-Pack) deliver consistent power to a wide variety of compatible toys and electronics. This pack contains 8 alkaline AA batteries, ensuring you have enough to power your device. Safe and environmentally friendly, they are also mercury- and cadmium-free. They deliver a long-lasting and reliable charge with a 2,900 mAh capacity and 1.5 V of power, ensuring your toys, remote controls, cameras and other electronics are ready to go. Keep your favorite electronics powered with alkaline batteries backed by Best Buy.
    See all Alkaline Batteries

    Product Description

    They’re just batteries – until your remote control is dead. The Best Buy essentials BE-BAA8PK AA Batteries (8-Pack) deliver consistent power to a wide variety of compatible toys and electronics. This pack contains 8 alkaline AA batteries, ensuring you have enough to power your device. Safe and environmentally friendly, they are also mercury- and cadmium-free. They deliver a long-lasting and reliable charge with a 2,900 mAh capacity and 1.5 V of power, ensuring your toys, remote controls, cameras and other electronics are ready to go. Keep your favorite electronics powered with alkaline batteries backed by Best Buy.
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    Your price for this item is $5.99
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  2. Best Buy essentials™ - AAAA Batteries (4-Pack) - Alt_View_Zoom_11
    Top comment

    "Didn't know they exist, battery replacement for smart pencils AAAA. Compatible with Logitech pencil....Bought these for my Laptop pen as a backup. They last very long"

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    Product Description

    They’re just batteries – until your remote control is dead. The Best Buy essentials BE-BAAAA4PK AAAA Batteries (4-Pack) deliver consistent power to a wide variety of compatible toys and electronics. This pack contains 4 alkaline AAAA batteries, ensuring you have enough to power your device. Safe and environmentally friendly, they are also mercury- and cadmium-free. They deliver a long-lasting and reliable charge with a 500 mAh capacity and 1.5 V of power, ensuring your toys, remote controls, cameras and other electronics are ready to go. Keep your favorite electronics powered with alkaline batteries backed by Best Buy.
    See all Alkaline Batteries
    Top comment

    "Didn't know they exist, battery replacement for smart pencils AAAA. Compatible with Logitech pencil....Bought these for my Laptop pen as a backup. They last very long"

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    Product Description

    They’re just batteries – until your remote control is dead. The Best Buy essentials BE-BAAAA4PK AAAA Batteries (4-Pack) deliver consistent power to a wide variety of compatible toys and electronics. This pack contains 4 alkaline AAAA batteries, ensuring you have enough to power your device. Safe and environmentally friendly, they are also mercury- and cadmium-free. They deliver a long-lasting and reliable charge with a 500 mAh capacity and 1.5 V of power, ensuring your toys, remote controls, cameras and other electronics are ready to go. Keep your favorite electronics powered with alkaline batteries backed by Best Buy.
    See all Alkaline Batteries
    Your price for this item is $4.99
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  3. Energizer MAX D Batteries (4 Pack), D Cell Alkaline Batteries - Front_Zoom
    Top comment

    "great battery for backup...great battery for any uses good for backups energizer batteries...Very good power backup, satisfied with the purchase.."

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    Product Description

    Keep your high-drain devices running with Energizer MAX D Alkaline Batteries. Energizer provides long lasting power for your everyday devices, whether you need replacement D cell batteries for high-tech flashlights or backup batteries for your child's toys. Made to last, not to leak, these Energizer D batteries have a shelf life of up to 10 years, so they're ready to keep your devices operating when you need them most. Depend on Energizer MAX D batteries to fuel your everyday electronics, whether you're at home, work or play.
    See all Alkaline Batteries
    Top comment

    "great battery for backup...great battery for any uses good for backups energizer batteries...Very good power backup, satisfied with the purchase.."

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    Product Description

    Keep your high-drain devices running with Energizer MAX D Alkaline Batteries. Energizer provides long lasting power for your everyday devices, whether you need replacement D cell batteries for high-tech flashlights or backup batteries for your child's toys. Made to last, not to leak, these Energizer D batteries have a shelf life of up to 10 years, so they're ready to keep your devices operating when you need them most. Depend on Energizer MAX D batteries to fuel your everyday electronics, whether you're at home, work or play.
    See all Alkaline Batteries
    Your price for this item is $13.99
    See all Alkaline Batteries
  4. Best Buy essentials™ - CR123 Batteries (6-Pack) - Alt_View_Zoom_11
    Top comment

    "Spare Batteries for Backup Power...At high illumination output, the headlamp goes through battery power quickly. Spare batteries for backup power are essential. In addition, the price is reasonable compared to same type Energizer CR123A battery....Reasonable price for security system battery replacements."

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    Product Description

    They’re just batteries – until your keyless entry is dead. The Best Buy essentials BE-B1236PK CR123 Batteries (6-Pack) deliver consistent power to a wide variety of compatible toys and electronics. This pack contains 6 lithium CR123 batteries, providing you with enough backups for when you need them. They deliver a reliable charge with a 1,400 mAh capacity and 3 V of power, ensuring your keyless entries, glucometers, games and other compatible electronics are ready to go. Be prepared for the next time you need power with batteries Backed by Best Buy.
    See all Alkaline Batteries
    Top comment

    "Spare Batteries for Backup Power...At high illumination output, the headlamp goes through battery power quickly. Spare batteries for backup power are essential. In addition, the price is reasonable compared to same type Energizer CR123A battery....Reasonable price for security system battery replacements."

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    Product Description

    They’re just batteries – until your keyless entry is dead. The Best Buy essentials BE-B1236PK CR123 Batteries (6-Pack) deliver consistent power to a wide variety of compatible toys and electronics. This pack contains 6 lithium CR123 batteries, providing you with enough backups for when you need them. They deliver a reliable charge with a 1,400 mAh capacity and 3 V of power, ensuring your keyless entries, glucometers, games and other compatible electronics are ready to go. Be prepared for the next time you need power with batteries Backed by Best Buy.
    See all Alkaline Batteries
    Your price for this item is $9.99
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  5. Best Buy essentials™ - 9 V Batteries (4-Pack) - Front_Zoom
    Top comment

    "Good utility battery for smoke detectors or battery backup for line powered devices...These are a good replacement for a 9 volt battery."

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    Product Description

    They’re just batteries – until your electronics are powerless. The Best Buy essentials BE-B9V4PK 9 V Batteries (4-Pack) deliver consistent power to a wide variety of compatible toys and electronics. This pack contains 4 alkaline 9 V batteries, ensuring you always have backups when you need them. Safe and environmentally friendly, they are also mercury- and cadmium-free. They deliver a long-lasting and reliable charge with a 500 mAh capacity and 9 V of power, ensuring your remote controls, alarms and other electronics are ready to go. Be prepared for the next time you need power with alkaline batteries Backed by Best Buy.
    See all Alkaline Batteries
    Top comment

    "Good utility battery for smoke detectors or battery backup for line powered devices...These are a good replacement for a 9 volt battery."

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    Product Description

    They’re just batteries – until your electronics are powerless. The Best Buy essentials BE-B9V4PK 9 V Batteries (4-Pack) deliver consistent power to a wide variety of compatible toys and electronics. This pack contains 4 alkaline 9 V batteries, ensuring you always have backups when you need them. Safe and environmentally friendly, they are also mercury- and cadmium-free. They deliver a long-lasting and reliable charge with a 500 mAh capacity and 9 V of power, ensuring your remote controls, alarms and other electronics are ready to go. Be prepared for the next time you need power with alkaline batteries Backed by Best Buy.
    See all Alkaline Batteries
    Your price for this item is $7.99
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  6. Energizer MAX C Batteries (4 Pack), C Cell Alkaline Batteries - Front_Zoom
    Top comment

    "I do wish the pack came as a set of 4 versus a set of 2. Backups are always handy, not to mention, several toys use 4 C batteries versus 2....Smoke alarm battery is dying. This is good replacement."

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    Product Description

    You can rely on your devices when you rely on the power of Energizer MAX Alkaline C Batteries. Made to last, not to leak, these Energizer batteries deliver long lasting power for your everyday devices. Energizer C batteries fuel the technology that helps you work and play, whether you need batteries for flashlights and children's toys or backup batteries for radios and other electronics. With a shelf life up to 10 years in storage, these C cell batteries are there when you need them. Trust the power of Energizer MAX C Batteries to keep the devices you love powered when you need them most.
    See all Alkaline Batteries
    Top comment

    "I do wish the pack came as a set of 4 versus a set of 2. Backups are always handy, not to mention, several toys use 4 C batteries versus 2....Smoke alarm battery is dying. This is good replacement."

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    Product Description

    You can rely on your devices when you rely on the power of Energizer MAX Alkaline C Batteries. Made to last, not to leak, these Energizer batteries deliver long lasting power for your everyday devices. Energizer C batteries fuel the technology that helps you work and play, whether you need batteries for flashlights and children's toys or backup batteries for radios and other electronics. With a shelf life up to 10 years in storage, these C cell batteries are there when you need them. Trust the power of Energizer MAX C Batteries to keep the devices you love powered when you need them most.
    See all Alkaline Batteries
    Your price for this item is $13.99
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  7. Energizer MAX C Batteries (8 Pack), C Cell Alkaline Batteries - Front_Zoom
    Top comment

    "great batteries for backup power long lasting in case of emergency...Just what we needed for replacement C batteries..."

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    Product Description

    You can rely on your devices when you rely on the power of Energizer MAX Alkaline C Batteries. Made to last, not to leak, these Energizer batteries deliver long lasting power for your everyday devices. Energizer C batteries fuel the technology that helps you work and play, whether you need batteries for flashlights and children's toys or backup batteries for radios and other electronics. With a shelf life up to 10 years in storage, these C cell batteries are there when you need them. Trust the power of Energizer MAX C Batteries to keep the devices you love powered when you need them most.
    See all Alkaline Batteries
    Top comment

    "great batteries for backup power long lasting in case of emergency...Just what we needed for replacement C batteries..."

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    Product Description

    You can rely on your devices when you rely on the power of Energizer MAX Alkaline C Batteries. Made to last, not to leak, these Energizer batteries deliver long lasting power for your everyday devices. Energizer C batteries fuel the technology that helps you work and play, whether you need batteries for flashlights and children's toys or backup batteries for radios and other electronics. With a shelf life up to 10 years in storage, these C cell batteries are there when you need them. Trust the power of Energizer MAX C Batteries to keep the devices you love powered when you need them most.
    See all Alkaline Batteries
    Your price for this item is $12.99
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  8. Energizer MAX AA Batteries (20 Pack), Double A Alkaline Batteries - Front_Zoom
    Top comment

    "Long lasting batteries are great to have as a backup if any of our other remote controls fail....They continue to be the best batteries out there and I always have them on hand to make replacements"

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    Product Description

    Power the devices you love with Energizer MAX Alkaline AA Batteries. These Energizer batteries fuel the technology that helps you live, work and play, whether you need remote batteries, clock batteries, or backup batteries for your child's favorite toys and games. Energizer's #1 longest-lasting MAX, these double A batteries keep your favorite devices running longer. Powerseal Technology helps protect your devices against damaging leaks for up to two years after these AA Energizer MAX Batteries are fully used. With a shelf life of up to 10 years in storage, these long lasting batteries are ready to keep your devices operating when you need them most. Depend on the power of Energizer MAX AA Batteries to power your everyday electronics.
    See all Alkaline Batteries
    Top comment

    "Long lasting batteries are great to have as a backup if any of our other remote controls fail....They continue to be the best batteries out there and I always have them on hand to make replacements"

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    Product Description

    Power the devices you love with Energizer MAX Alkaline AA Batteries. These Energizer batteries fuel the technology that helps you live, work and play, whether you need remote batteries, clock batteries, or backup batteries for your child's favorite toys and games. Energizer's #1 longest-lasting MAX, these double A batteries keep your favorite devices running longer. Powerseal Technology helps protect your devices against damaging leaks for up to two years after these AA Energizer MAX Batteries are fully used. With a shelf life of up to 10 years in storage, these long lasting batteries are ready to keep your devices operating when you need them most. Depend on the power of Energizer MAX AA Batteries to power your everyday electronics.
    See all Alkaline Batteries
    Your price for this item is $23.99
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  9. Energizer MAX AA Batteries (8 Pack), Double A Alkaline Batteries - Front_Zoom
    Top comment

    "Better than most of the others in terms of backup....Good backup battery...Doesn't last as long as a Duracell but it's a decent backup."

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    Product Description

    Power the devices you love with Energizer MAX Alkaline AA Batteries. These Energizer batteries fuel the technology that helps you live, work and play, whether you need remote batteries, clock batteries, or backup batteries for your child's favorite toys and games. Energizer's #1 longest-lasting MAX, these double A batteries keep your favorite devices running longer. Powerseal Technology helps protect your devices against damaging leaks for up to two years after these AA Energizer MAX Batteries are fully used. With a shelf life of up to 10 years in storage, these long lasting batteries are ready to keep your devices operating when you need them most. Depend on the power of Energizer MAX AA Batteries to power your everyday electronics.
    See all Alkaline Batteries
    Top comment

    "Better than most of the others in terms of backup....Good backup battery...Doesn't last as long as a Duracell but it's a decent backup."

    See all customer reviews

    Product Description

    Power the devices you love with Energizer MAX Alkaline AA Batteries. These Energizer batteries fuel the technology that helps you live, work and play, whether you need remote batteries, clock batteries, or backup batteries for your child's favorite toys and games. Energizer's #1 longest-lasting MAX, these double A batteries keep your favorite devices running longer. Powerseal Technology helps protect your devices against damaging leaks for up to two years after these AA Energizer MAX Batteries are fully used. With a shelf life of up to 10 years in storage, these long lasting batteries are ready to keep your devices operating when you need them most. Depend on the power of Energizer MAX AA Batteries to power your everyday electronics.
    See all Alkaline Batteries
    Your price for this item is $8.99
    The previous price was $10.99
    See all Alkaline Batteries
  10. Energizer MAX AA Batteries (16 Pack), Double A Alkaline Batteries - Front_Zoom

    Product Description

    Power the devices you love with Energizer MAX Alkaline AA Batteries. These Energizer batteries fuel the technology that helps you live, work and play, whether you need remote batteries, clock batteries, or backup batteries for your child's favorite toys and games. Energizer's #1 longest-lasting MAX, these double A batteries keep your favorite devices running longer. Powerseal Technology helps protect your devices against damaging leaks for up to two years after these AA Energizer MAX Batteries are fully used. With a shelf life of up to 10 years in storage, these long lasting batteries are ready to keep your devices operating when you need them most. Depend on the power of Energizer MAX AA Batteries to power your everyday electronics.
    See all Alkaline Batteries

    Product Description

    Power the devices you love with Energizer MAX Alkaline AA Batteries. These Energizer batteries fuel the technology that helps you live, work and play, whether you need remote batteries, clock batteries, or backup batteries for your child's favorite toys and games. Energizer's #1 longest-lasting MAX, these double A batteries keep your favorite devices running longer. Powerseal Technology helps protect your devices against damaging leaks for up to two years after these AA Energizer MAX Batteries are fully used. With a shelf life of up to 10 years in storage, these long lasting batteries are ready to keep your devices operating when you need them most. Depend on the power of Energizer MAX AA Batteries to power your everyday electronics.
    See all Alkaline Batteries
    Your price for this item is $19.49
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