Demand for reflow-compatible electronic components is constantly growing, due to the desire for increased production efficiency and more consistent product quality.

In response, Seiko Instruments (SII) has developed rechargeable button cells that can be conveniently integrated in the reflow installation process. The conventional rechargeable ML button cells (manganese-lithium-aluminium alloy) from SII are already successfully used in mass production.

The manufacturer has now succeeded in developing additional reflow variants of MS lithium batteries with higher voltage, greater capacity and superior cycle properties. 

The technology offers the following 4 benefits:

1. Reflowable: Automatic installation and reflow soldering on printed circuit boards (PCBs) improves soldering efficiency, shortens lead times in production and ensures consistent and stable product quality.
2. Higher voltage: Compared to SII’s lithium button cell (3.1 V) type ML, MS621R and MS421R can be charged to a maximum of 3.3 V and offer more flexibility in the circuit design.
3. More capacity: The capacity of MS421R and MS621R is 1.5 to 3 times higher than the lithium button cell type ML from SII.
4. Superior cycle properties: The capacity of the MS621R and MS421R exhibits less deterioration after repeated deep charging cycles than the ML battery from SII. This property offers benefits for the different uses required by the customer.