- GaryLv 72 個月前
It is not practical to do so.
The most accurate method is to check its discharge time. But that means you will have to buy equipment for that, which can cost as much as a new power bank.
Battery capacity varies over time, due to battery quality, usage, etc.
So if you want high-quality power banks, choose major brands.
- 「本週之星」Lv 72 個月前