From old datasheet system 5.0 mm ′ 2.0 mm series 5.0 MM ? 2.0 MM series Opto-Electronic Device - Visible Light Emitting Diodes - Point-Lighting LEDs 5.0 mm 2.0 mm series
<font color=red>[Old version datasheet]</font> Voltage Protection for 2-series, 3-series, or 4-series Cell Li-Ion Batteries (Second-Level Protection)