Portable outdoor power banks, which are using LiFeP04 batteries, are now very popular. Light weight and large capacity are its advantage.
The battery has good stability and is very safe, and the charging current can be increased so that the recharging time can be shortened to 3 hours from 10 hours before.
Outdoor power banks were expected to be very popular in the past 5-10 years.
However, because Li-polymer batteries are very easy to absorb water and expand, the battery life is shortened to less than 3 years, so everyone is not willing to use and promote.
Using high-quality batteries, with a battery protection board of sufficient capacity output, and a dedicated LiFeP04 charger, can make LiFeP04 battery last 10 years, 2000 times.