Customer Ratings & Reviews
 or email [service@energizerpowerpacks.com](mailto:service@energizerpowerpacks.com).](https://pisces.bbystatic.com/image2/BestBuy_US/images/products/e561f45b-712a-4a33-bd65-672e90b17c9f.jpg)
- Model:
- UE10035C
- |
- SKU:
- 6589876
Customer reviews
Rating 4.5 out of 5 stars with 544 reviews
(544 customer reviews)Rating by feature
- Value4.7
Rating 4.7 out of 5 stars
- Quality4.6
Rating 4.6 out of 5 stars
- Ease of Use4.7
Rating 4.7 out of 5 stars
Customers are saying
Customers express satisfaction with the MAX 10,000mAh power bank's portability, charging speed comparable to wall chargers, and outstanding battery life for its cost. Its overall performance and convenient size are also well-received. The lightweight design, reasonable price, and helpful LCD display contribute to a positive user experience.
This summary was generated by AI based on customer reviews.
Rated 3 out of 5 stars
Charge very slow
||Posted . Owned for 1 month when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.I put my s25 on charge and its say 7 hours to full charge
No, I would not recommend this to a friendBrand response from Jamal Chen
Posted .Hi Umesh,
We’re sorry the charging speed feels so slow. The MAX 10,000mAh power bank supports up to 15W output, but actual charging time depends on the phone’s power draw and cable quality. For faster results, please use the USB-C port with a high-quality cable and a 15W adapter. If the speed remains unusually low, it could indicate a defect—please contact our support team for assistance or a possible replacement:
--Energizer PowerPacks Service Team
Rated 4 out of 5 stars
Charger
||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 friendRated 3 out of 5 stars
Energizer battery
||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 friendBrand 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 3 out of 5 stars
Doesn’t last very long between charges
||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 friendBrand 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 2 out of 5 stars
A Short Life
||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 friendBrand 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 2 out of 5 stars
Missing Item
||Posted . Owned for 3 weeks when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.This was an open box purchase of which all of its contents would be included. However, the USB cord was missing upon opening the box when I got home.
I would recommend this to a friendBrand response from Energizer PowerPacks Service Team
Posted .Hi Regular,
Sorry to hear the USB cord was missing from your open‑box purchase. Since open‑box items should still include all required accessories, the best next step is to contact the original retailer’s customer service so they can assist you with the missing item.
Rated 2 out of 5 stars
Better than nothing
||Posted .This reviewer received promo considerations or sweepstakes entry for writing a review.I guess it's better than having nothing in a pinch. Charges extremely slow. Charging one smart phone takes most of the battery. Not sure this size would be good for a tablet or laptop.
No, I would not recommend this to a friendBrand response from Energizer PowerPacks Service Team
Posted .Hi SensibleSam,
Sorry to hear about the slow charging experience. This model is designed for smartphones and smaller devices, so charging a tablet or laptop will be less efficient. For faster charging and better performance with larger devices, you might consider a higher-wattage power bank (20W or above) or one with Power Delivery (PD) support.
Rated 2 out of 5 stars
Portable bank power
||Posted . Owned for 1 month when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.Dont like it at all issues with changer super slowly different cords changers
No, I would not recommend this to a friendBrand response from Energizer PowerPacks Service Team
Posted .Hi JhaerodE,
Sorry you're having issues with very slow charging and needing different cords. That’s definitely frustrating. The power bank should provide consistent charging, so if it isn’t performing properly, our support team can help troubleshoot or arrange assistance:
https://support.energizerpowerpacks.com/
Rated 2 out of 5 stars
Charge limit is too low for new phones
||Posted . Owned for 3 months when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.Charge limit is too low for common applications so turned out to not be very useful
No, I would not recommend this to a friendBrand response from Energizer PowerPacks Service Team
Posted .Hi Electron,
Thanks for sharing your thoughts. The 15W output on this model is intended for basic smartphone charging, so it may feel limited for newer phones with higher power requirements. If you need faster charging and broader compatibility, we recommend looking for a power bank with 20W or higher output and Power Delivery (PD) support for modern devices.
Rated 3 out of 5 stars
good value for a slow charger
||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 friendRated 3 out of 5 stars
It's okay
||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 friendBrand 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
Battery Charger
||Posted . Owned for 1 month when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.Unable to see the benefits in this battery. Just keep your plug on you. It’s smaller and plugs are everywhere.
No, I would not recommend this to a friendBrand response from Energizer PowerPacks Service Team
Posted .Hi RussellT,
Sorry to hear this power bank didn’t feel useful for your needs.
This model is designed for moments when plugs aren’t convenient or available—such as travel, commuting, outdoor use, or unexpected power outages. The 10,000mAh capacity can provide multiple phone recharges, the three ports allow you to charge more than one device, and the LCD screen gives a clear view of remaining power so there are no surprises.
We appreciate you sharing your perspective, as it helps other customers decide whether this type of backup power fits their lifestyle.
Rated 2 out of 5 stars
Not worth buying
||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 friendBrand 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
Display no longer works
||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 friendBrand 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
Energizer Power Pack Malfunction
||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 friendBrand 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 1 out of 5 stars
Great until it stops working too soon
||Posted .This reviewer received promo considerations or sweepstakes entry for writing a review.The powerpack was great for about 6 months and then stopped working. I went to Best Buy and they said to request warranty replacement from Energizer. I have submitted 3 online requests with no response.
No, I would not recommend this to a friendBrand response from Energizer PowerPacks Service Team
Posted .Hi KarenS,
We’re sorry to hear your power bank stopped working and that you haven’t received a response yet. Please try contacting Energizer support again through this link:
You can also check your spam folder or use an alternate email to ensure their reply isn’t missed.
Rated 1 out of 5 stars
Never Delivered.
||Posted .This reviewer received promo considerations or sweepstakes entry for writing a review.Never delivered, and then product returned to Best buy. Not really a product issue but a shipping issue. However since best buy keeps sending me emails to review, here ya go.
No, I would not recommend this to a friendBrand response from Energizer PowerPacks Service Team
Posted .Hi ShannonN,
I’m sorry your order never made it to you and was returned in transit. Since this was a shipping issue rather than a product issue, your frustration is completely understandable.
Rated 1 out of 5 stars
Returned
||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 friendBrand 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.
- Pros mentioned:Portability
Rated 1 out of 5 stars
Disappointed
||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 friendBrand 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
||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 friendBrand 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