How Do You Know When Your Iphone Battery Is Bad. The average iPhone battery retains only 80 percent of its original. They immediately believe a short-lasting battery life equals a phone replacement.
The only way to tell if the iPhone battery is completely dead at this point is to connect the phones charger and look for a battery icon. To avoid future shut-downs you may need a new iPhone battery. According to Apple the iPhone 6s battery maintains 80 percent of its capacity for up to 500 charging cycles.
All rechargeable batteries become less efficient over time and sadly the battery for your iPhone is no exception.
This isnt a safety issue. According to Apple the iPhone 6s battery maintains 80 percent of its capacity for up to 500 charging cycles. The lithium-ion batteries in iPhones and all electronic devices are consumable products. Battery in the Red When your iPhones battery is dead the phones screen is black and you cannot access any of the phones functions.
