In-Cell Charge Control

In-Cell Charge Control or I-C3 is a method for very rapid charging of NiMH batteries, patented by Rayovac. Batteries using this technology are commonly sold as "15 minute rechargeables".

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The charge control consists of a pressure switch built into the cell, which disconnects the charging current when the internal cell pressure rises above a certain limit (usually 200 to 300 psi or 1.4 to 2.1 MPa). This prevents overcharging and damage to the cell.

Source: US patent 6,878,481