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iPhone 5/5s Battery Case,ZeroLemo iPhone 5/5s Ultra Slim Juicer External Protective Battery Case -...
More product info From ZeroLemon

Amazon Reviews for  iPhone 5/5s Battery Case,ZeroLemo iPhone 5/5s Ultra Slim Juicer External Protective Battery Case - [MFI Apple Certified] 2400mAh Capacity (Fits All Versions of iPhone 5/5s)-[180 days Warranty Guarantee]-Black
Rating:
122 Ratings
122 Reviews
("Ratings" vs. "Reviews")
49% of potentially unnatural reviews removed (why?)
Adjusted:
View/Edit Adjustment
Jump to Report Card
Report Info:

Report Card

Warn Overall Grade
FAIL Unverified Purchases
FAIL Suspicious Reviewers
FAIL Overlapping Review History
WARN Deleted Reviews
WARN Phrase Repetition
PASS Rating Trend
PASS Word Count Comparison
PASS Reviewer Participation
PASS Reviewer Ease
PASS Brand Repeats
PASS Incentivized Reviews

Most Trusted Reviews

Great case, I5S gets a full charge out of it [Go to full review]
Mar 23, 2015      
100% TRUST
  • Verified Purchaser
  • Critical Reviewer (avg. rating: 4.3)


Least Trusted Reviews

Finally a battery that really works on iPhone! The case ... [Go to full review]
Oct 27, 2014      
0% TRUST
  • Unverified Purchaser
  • Take-Back Reviewer (8 deleted Reviews; avg. rating: 5.0)
  • Brand Repeater (3 of 345 reviews for this brand; avg rating: 5.0)
  • Overlapping Review History: reviewed 1 of 9 top products
  • Easy Grader (avg. rating: 4.8)


Analysis Details

Fail Unverified Purchases

47 of the 122 total reviews for this product are unverified purchases. The unverified purchasers have rated this product an average of 4.5 while the verified purchasers have rated this product an average of 3.9. Based on our statistical modeling, the discrepancy in average rating between these two groups is significant enough to believe that the difference is not due to random chance, and may indicate that there are unnatural reviews.

from unverified purchasers

from verified purchases


4.5
3.9


Unverified purchases may be the result of Kindle Unlimited readers, buyers who didn't pay full price, or reviewers who did not purchase the product at Amazon. Read more about our Unverified Purchases test.

Fail Suspicious Reviewers

Take-Back Reviewers


26 of the 122 reviewers have had at least one of their past reviews for another product deleted. This is an excessively large percentage of Take-Back Reviewers which may indicate unnatural reviews.

from take-back reviewers

from reviewers without previously deleted reviews


4.5
4.0


Single-Day Reviewers


11 of the 122 reviewers have written multiple reviews but posted all of them on a single day. The Single-Day reviewers have rated this product an average of 3.3 while all other reviewers rated this product an average of 4.2. Based on our statistical modeling, the discrepancy in average rating between these two groups is significant enough to believe that the difference is not due to random chance, and may indicate that there are unnatural reviews.

from single-day reviewers

from non-single-day reviewers


3.3
4.2


Read more about our Suspicious Reviewers test.

Fail Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:

5% also reviewed:
Product Unavailable by

4% also reviewed:
Product Unavailable by

Does not include products
from the same brand


34 of the 122 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.5 while the reviewers who have a more unique product review history rated this product an average of 4.0. Based on our statistical modeling, the discrepancy in average rating between these two groups is significant enough to believe that the difference is not due to random chance, and may indicate that there are unnatural reviews.

from reviewers with substantial overlapping history

from reviewers without a substantial overlapping history


4.5
4.0


Read more about our Overlapping Review History test.

Warn Deleted Reviews

We discovered a total of 1 deleted Review for this product, with an average rating of 4. Even though deleted reviews don't affect the average rating, the fact that action was taken to delete reviews raises some red flags about the integrity of the reviews for the product as whole.

There are a few limitations to keep in mind regarding the Deleted Reviews test:
  1. We don't have a magic ability to collect every single deleted review; we can only identify reviews as deleted if we collect them on one date and then notice they are no longer visible on a subsequent date.
  2. We have no information on reviews that were never published in the first place.
  3. We also don't know why these reviews were removed. It could be action from the platform, personal decision by the review author, part of an entire account closure, even some data error on our part, etc.
Read more about our Deleted Reviews test.

4.0 average rating of deleted reviews

4.0


Show distribution of deleted reviews

Warn Phrase Repetition
Reviews that contain one of these phrases are NOT necessarily devalued; read more about how this test works here.

Common Phrases in Titles:
2 reviews
2 reviews
2 reviews
2 reviews
Show MoreShow Less


41 of the 122 total reviews for this product use substantial repetitive phrases between them. This is an excessively large percentage which may indicate unnatural reviews.

from reviews with substantial repetitive phrases

from reviews without substantial repetitive phrases


4.2
4.1


Read more about our Phrase Repetition test.

Pass Rating Trend

  • 5%
  • Created over 2 days

We counted 122 reviews for this product over the span of 988 days, an average of 0.1 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 2 or fewer reviews on any given day.

However, we see the following 2 days exceeding this threshold:In total, we found that 6 reviews were created on just 2 days. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from reviews created on high volume days

from reviews created on normal volume days


4.5
4.1


Read more about our Rating Trend test.

Pass Word Count Comparison

  • 18%
  • Have an overrepresented word count

In the graph above, we can see the distribution of review word counts for this product and the expected distribution for this category. We see the following 1 group with a statistically significant greater concentration than what we'd expect to see:In total, we found that 22 reviews (or 18%) are within an overrepresented word count group. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from reviews with an overrepresented word count

from reviews with a properly represented word count


4.1
4.1


Read more about our Word Count Comparison test.

Pass Reviewer Participation

  • 0%
  • From reviewers with an overrepresented participation
We didn't find any participation groups that had a statistically significant greater concentration than what we'd expect to see in this category.
Read more about our Reviewer Participation test.

Pass Reviewer Ease
The ease score is the average rating for all reviews that a given reviewer submits. The average ease score for reviewers of this product is 4.2, while the average ease score for reviewers in this category is 4.3.

4.2 Product's Average Ease Score

4.3 Category's Average Ease Score


4.2
4.3


Read more about our Reviewer Ease test.


Pass Brand Repeats

Brand Repeaters


19 of the 122 reviewers have reviewed other products for this brand. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from Brand Repeaters

from Non-Repeaters


4.7
4.0


Read more about our Brand Repeats test.

Pass Incentivized Reviews
On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.


4 of the 122 total reviews for this product admitted to receiving a free or discounted product in exchange for a review. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

from incentivized reviews

from non-incentivized reviews


4.5
4.1


Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.