A simplified explanation for why the TP:247 charges a lithium battery faster from zero than at 20% capacity is that the battery can accept a higher charging current when it is nearly empty. As the battery fills up and reaches higher capacity levels, it becomes more resistant to accepting a high charging current, causing the charging process to slow down

An empty phone battery charges by 1% per minute. By using the TP:247 you can give an empty phone battery enough charge to make an emergency call in approximately 2.5 minutes. 10 minutes of use gives approximately 1hr of talk time. With only a weight of 1.21 pounds.

TP:247 Power Curve

Results from performance testing the TP:247 across a range of turning speeds.

Introduction & Guide