Comparison Videx 1x18650 3400 mAh vs Videx 1x18650-P 3400 mAh

The presence of a protection board in the design of the battery (see "Type").

As the name implies, this feature is designed to protect the battery from failure and damage when operating in non-standard modes. In particular, the protection board usually "monitors" the level of charge, preventing both excessively deep discharge and overcharging, and also limits the charge and discharge currents. Thus, the operation is as simple and convenient as possible: the battery, in fact, monitors its own condition.

Note that a protection board is not always needed: some devices have their own battery controllers.