Samsung says bad battery design and a rush to release an updated version of the Galaxy Note 7 caused some of the devices to overheat and explode in a new report the company released Sunday night.
Samsung said in the report that two separate battery malfunctions caused some Note 7 phones to overheat and even catch fire in some cases.
The first problem affected the first batch of Note 7 phones that launched last fall. In those phones, the battery was too large for the casing of the phone, which caused some to overheat, according to Samsung's report.
After Samsung recalled the initial batch of Note 7 phones, it manufactured the phone with a battery from a different supplier. But Samsung was in a rush to get the new phones out, and the new battery produced by the supplier had a defect that also caused it to overheat, the report said.