The document discusses issues with the battery in the Samsung Galaxy Note 7 phone. Two defects caused batteries to overheat and explode - a design flaw in the negative electrode and welding issues in replacement batteries. This was due to incorrect placement of the negative electrode tip and burrs in the positive electrode welding. The manufacturing issues led to Samsung recalling Note 7 phones and losing $17 billion in revenue, damaging their business and customer perception.

1. Galaxy note and their battery
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2. Introduction
 The Samsung Galaxy Note 7 was unveiled by Samsung
Electronics in 2006
 It was the first phone by Samsung Electronics that had a
symmetrical connector.
 It was also the last phone that had a home button in the
Galaxy Note Series
 Note 7’s pre-order record was the highest in South Korea
 It received a lot of positive reviews from technology
enthusiasts because of its flawless interface

3. The Problem
 Battery defects caused the devices to overheat and
explode or combust
 Defect 1: The batteries had a design flaw especially with
the upper right corner which led to short circuit
 Defect 2: Replacement batteries had a manufacturing
issue as a result of welding defect from the
manufacturing process

4. The Root Problem
Defect 1
 Main cause: The negative electrode of the phones device was
deflected in the upper-right corner
 More cause: The battery’s negative electrode had its tip
incorrectly located in the curve as compared to it being on the
planar area
Defect 2
 Main cause: The positive electrode had high welding burrs which
led to the penetration of separator and insulation tap thus
causing direct contact between the negative electrode and the
positive tab
 More cause: Most batteries were missing the insulation tape

5. Manufacturing Process
Samsung Electronics’ batteries are produced by its
subsidiary Samsung SDI
A short circuit in a battery may result when the
separator has been damaged since it results to
negative and positive electrodes meeting with the
jellyroll

6. The Aftermath
 Samsung Electronics' operating profits went down by 33%
as compared to the previous quarter in 2016.
 It lost at least $17 billion in revenues from the recall of
the phones
 Galaxy Note 7 is considered as the device having the
shortest life span of all Samsung smartphones.
 Samsung released Galaxy Note Fan Edition in 2017 which
is the refurbished version of Galaxy Note 7.

7. Conclusion
 The results from the Samsung's study showed that
manufacturing issues were to blame for the Note 7
battery explosion incidents
 After realizing the problem with the battery, the company
informally recalled the devices.
 The recall impacted the Samsung’s business including the
perception of the customers