What is the expiration date of the fire emergency lamp? How long is mandatory abandonment?
But in fact, the user is difficult to have relevant knowledge and skills, it is recommended not to change their own.
The battery is a core component of the product. If the manufacturer allows the user to replace the battery by himself, and the battery performance exceeds or is equal to the original battery, it can change itself.
Another: you can refer to the use of electronic products 8 years of relevant regulations, generally 10 years or more should be eliminated.
manufacturers marked with shelf life, in the shelf life has been, and the performance can not meet the requirements of use
parts damaged, unable to repair or maintenance costs are too large;
