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Customer Ratings & Reviews

Your price for this item is $14.99
The comparable value price is $19.99

Customer reviews

Rating 4.6 out of 5 stars with 418 reviews

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  • Value

    Rating 4.7 out of 5 stars

  • Quality

    Rating 4.6 out of 5 stars

  • Ease of Use

    Rating 4.8 out of 5 stars

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91%would recommend to a friend

Customers are saying

Customers are positive about the MAX 10,000mAh power bank, frequently praising its long battery life, convenient size, and reasonable price. Many appreciate the LCD display for easily monitoring the remaining charge, and find it portable and lightweight. The sleek design also receives positive feedback. There were no negative customer comments reported.

This summary was generated by AI based on customer reviews.

The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.
Page 20 Showing 381-400 of 418 reviews
  • Rated 3 out of 5 stars

    Disappointed

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    Posted . Owned for 2 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    It does not fit my iPhone 13 and thus can not use the charger

    No, I would not recommend this to a friend
    • Brand response from Jamal Chen
      Posted .

      We're sorry to hear that the charger doesn't fit your iPhone 13. Please provide the following information to our dedicated email service@tennrich.com

  • Rated 3 out of 5 stars

    Energizer battery

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    Posted . Owned for 2 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    I wished maybe i would have purchased a faster charger because this slow at charging. This takes way to long. Otherwise ita basic it perfoms adequately.

    No, I would not recommend this to a friend
    • Brand response from Jamal Chen
      Posted .

      Thank you for your feedback! We're glad to hear our power bank is performing adequately for your basic needs. We apologize, however, that the charging speed did not meet your expectations. The speed depends heavily on the wall adapter you use to recharge the power bank itself. For the fastest results, we recommend an adapter that supports Power Delivery or Quick Charge 3.0 to reduce the time it takes to get a full charge.

      -- Energizer PowerPacks Service Team

  • Rated 5 out of 5 stars

    Well made and works fine.

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    Posted . Owned for 3 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Well made and works fine. Would recommend to a friend.

    I would recommend this to a friend
  • Rated 5 out of 5 stars

    Good value, light weight, convenient

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    Posted . Owned for 1 week when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Light weight, convenient - good for recharging your phone when traveling.

    I would recommend this to a friend
  • Rated 2 out of 5 stars

    A Short Life

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    Posted . Owned for 3 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    This battery pack was purchased in late 12/2024 and hasn't gotten a whole lot of use since then; probably less than 20 charge/discharge cycles. The issue with this is the ability for the discharge to remain active while hooked to a bluetooth speaker via USB-C. The battery constantly turns off and has to be reactivated by changing the port or pressing the ON button. I don't know what is causing this because I'm using it outdoors (open cab delivery truck) and it doesn't feel hot either. In any case, it was a bargain with free shipping and I'll be recycling this one as soon as a possible.

    No, I would not recommend this to a friend
    • Brand response from Jamal Chen
      Posted .

      Thank you for sharing your experience. The behavior you’re describing with the UE10035C power bank is likely due to its auto shut-off function, which activates when the output current is too low — a common situation when powering Bluetooth speakers.

      To resolve this, please activate the trickle-charging mode (usually done by double-pressing the power button). This mode is designed to keep the output active for low-power devices like Bluetooth speakers or earbuds.

      If you have any questions or need assistance, feel free to contact us at service@tennrich.com.

  • Rated 4 out of 5 stars

    Charger

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    Posted . Owned for 3 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Doesn’t hold a charge for long if not in use. Good to have around

    I would recommend this to a friend
  • Rated 3 out of 5 stars

    Doesn’t last very long between charges

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    Posted . Owned for 1 week when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    If you’re looking for one that will charge a phone several times before it needs to be charged then you may want to look at a larger one. But that being said it does do what it is supposed to do.

    I would recommend this to a friend
    • Brand response from Jamal Chen
      Posted .

      Thank you for your feedback! We appreciate your insight. The charging capacity of a power bank depends on its battery size and output efficiency. If you're looking for a model that can charge your phone multiple times before needing a recharge, we recommend considering a higher-capacity power bank, such as our 30,000mAh models.

      We’re glad to hear that the power bank is performing as expected. If you need recommendations for a larger model, feel free to reach out!

      Energizer Power Bank
      Service Team

  • Rated 1 out of 5 stars

    Returned

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    Posted . Owned for 2 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Bought 2 of these for my grandsquad. They charged for a couple of days and stopped. One of the end pieces broke off of the charging cord. I was very disappointed. My 8yr old was enjoying having her own battery pack for her iPad

    No, I would not recommend this to a friend
    • Brand response from Jamal Chen
      Posted .

      Hi SWil40,
      We’re sorry to hear about the charging issues and the broken cord piece. That’s definitely not the experience we want for you or your grandsquad. Please visit our support page at so we can assist with troubleshooting or arrange a replacement.

  • Rated 2 out of 5 stars

    Not worth buying

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    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    I charged this product for days and my phone did not charge when I plugged it in

    No, I would not recommend this to a friend
    • Brand response from Jamal Chen
      Posted .

      Hi Diane,
      Thanks for sharing your experience. If the power bank was fully charged but didn’t charge your phone when plugged in, it could be due to a faulty output port or internal circuit issue. That’s definitely not how this product is supposed to perform.
      We’d like to help resolve this. Please visit our support page at https://support.energizerpowerpacks.com/ so we can assist you further or arrange a replacement if needed.
      --Energizer PowerPacks Service Team

  • Rated 3 out of 5 stars

    good value for a slow charger

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    Posted . Owned for 4 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    it works, slow charging, and takes a long time to refill, but its cheap and gets the job done

    I would recommend this to a friend
  • Rated 3 out of 5 stars

    It's okay

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    Posted . Owned for 3 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Not bad. Mine was a bit defective I kept plugging and unplugging

    I would recommend this to a friend
    • Brand response from Jamal Chen
      Posted .

      Dear valued customer,
      Thank you for the comment.
      We apologize for the unsatisfactory user experience we have caused you.
      If you have any other questions about the product,
      please feel free to contact us.(service@energizerpowerbanks.com)
      We will be glad to assist you.
      Thank you.

  • Rated 2 out of 5 stars

    PORTABLE CHARGER

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    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    It dosent last very long, maybe one charge. Depending on the phone you have.

    No, I would not recommend this to a friend
    • Brand response from Jamal Chen
      Posted .

      Hi KayC,
      Thanks for sharing! The battery life of the MAX 10,000mAh power bank can vary depending on your phone model and usage. If your phone has a larger battery (e.g., 4,000mAh or more), a single full charge may use up most of the power bank’s capacity.
      Also, using your phone while charging can drain the power bank faster. This model is designed for one full charge or multiple quick top-ups, rather than extended use.
      We hope this helps clarify the product’s intended performance.
      --Energizer PowerPacks Service Team

  • Rated 1 out of 5 stars

    If I can give negative stars

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    Posted . Owned for 2 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    -10/10 trash product only charge 1% then shut off plus the staff won’t refunded never buying charge or from Best Buy again

    No, I would not recommend this to a friend
    • Brand response from Jamal Chen
      Posted .

      Hi Neveragain,
      We’re truly sorry to hear about your experience. A power bank that shuts off after charging just 1% is clearly not performing as it should, and we understand how frustrating it must be—especially when you weren’t able to get a refund.
      If you haven’t returned the product yet, we’d like to help. Please visit https://support.energizerpowerpacks.com/ so we can assist with troubleshooting or a replacement.
      --Energizer PowerPacks Service Team

  • Rated 1 out of 5 stars

    Missing cable

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    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    It was missing the charging cable. It was an open box item but it did not state on the open box item label that it was missing the cable, it only said it had scratches or marks. I called the store and they said they couldn’t do anything about it. I got it as an emergency way to charge my phone while out fishing and couldn’t even use it.

    I would recommend this to a friend
    • Brand response from Jamal Chen
      Posted .

      We want to help you with this issue. Please visit our support page at https://support.energizerpowerpacks.com/ and fill out the form so our team can assist you.-- Energizer PowerPacks Service Team

  • Rated 3 out of 5 stars

    Display no longer works

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    Posted . Owned for 2 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Decent charger however percentage no longer displayed if not charging

    I would recommend this to a friend
    • Brand response from Jamal Chen
      Posted .

      Dear valued customer,
      Thank you for the comment.
      We apologize for the unsatisfactory user experience we have caused you.
      If you have any other questions about the product,
      please feel free to contact us.(service@energizerpowerbanks.com)
      We will be glad to assist you.
      Thank you.

  • Rated 2 out of 5 stars

    Not goid charging

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    Posted . Owned for 2 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Dont last long for charing if you get full charge then you have to recharge battery

    No, I would not recommend this to a friend
    • Brand response from Jamal Chen
      Posted .

      We apologize for the confusion regarding the power bank's charging time. The battery life you get from a power bank is directly related to the battery size of the device you are charging. For instance, a 10,000mAh power bank can fully charge a smartphone multiple times, but it would provide fewer charges for a tablet and may not be suitable for a laptop. If you are experiencing any other issues, we'd be happy to help. Please visit our support page at https://support.energizerpowerpacks.com/ and fill out the form so our team can assist you.

      -- Energizer PowerPacks Service Team

  • Pros mentioned:
    Portability

    Rated 1 out of 5 stars

    Disappointed

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    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Completely charged once and used only on one device once. Very disappointing. I bought it because of the brand and how convenient it to carry it.

    No, I would not recommend this to a friend
    • Brand response from Jamal Chen
      Posted .

      Dear valued customer,
      Thank you for the comment.
      We apologize for the unsatisfactory user experience we have caused you.
      If you have any other questions about the product,
      please feel free to contact us.(service@energizerpowerbanks.com)
      We will be glad to assist you.
      Thank you.

  • Rated 1 out of 5 stars

    Instant battery charger

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    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Literally lasted one day..do not buy! I took it immediately back to the store two days later Best Buy was great they retuned it with no issues.

    No, I would not recommend this to a friend
    • Brand response from Jamal Chen
      Posted .

      Hi RACHELLER,
      We're truly sorry to hear that the Energizer MAX 10,000mAh Portable Battery Charger didn’t meet your expectations and lasted only one day. That’s definitely not the experience we aim to deliver. We're glad to hear Best Buy handled your return smoothly — we appreciate you giving the product a try.
      If you ever consider trying another model or have questions about our lineup, we’re here to help.
      --Energizer PowerPacks Service Team

  • Rated 1 out of 5 stars

    Energizer Power Pack Malfunction

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    Posted . Owned for 1 week when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    This is the second one I’ve purchased and it is doing the same thing as the first one. When I go to charge it the power pack starts flashing 188 which means there is an internal malfunction. I will have to return and replace this one just like the first one. This is getting irritating.

    No, I would not recommend this to a friend
    • Brand response from Jamal Chen
      Posted .

      We’re very sorry to hear you’re experiencing the same issue again. The "188" flashing typically indicates an internal malfunction, as you mentioned. We completely understand how frustrating this must be and sincerely apologize for the inconvenience.

      Please contact us at service@tennrich.com with your purchase details and a photo or video of the issue, and we will assist you with a replacement under warranty. We truly appreciate your patience and will do our best to resolve this quickly.

  • Rated 2 out of 5 stars

    Energizer Portable Battery Charger

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    Posted . Owned for 3 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    This charger bank will only charge to 70%. I am returning it due to the length of time it takes to charge my phone.

    No, I would not recommend this to a friend
    • Brand response from Jamal Chen
      Posted .

      Dear valued customer,
      Thank you for the comment.
      We apologize for the unsatisfactory user experience we have caused you.
      If you have any other questions about the product,
      please feel free to contact us.(service@energizerpowerbanks.com)
      We will be glad to assist you.
      Thank you.