NGM BL-OS4 Smartphone Replacement Battery 3.7V 1000mAh 4FA50 and a 1 year warranty—your

and a 1 year warranty—your best choice for a high-performance

place the handset in the base and wait — most Cobra chargers will trickle-charge a low-voltage pack for 30 to 60 seconds before switching to normal charge mode

20mm — check these against your existing cell before ordering

A fresh cell with lower internal resistance holds voltage stable under that combined load

Both instruments use this pack to power optical measurement and ink density analysis during portable field and press-side use

NGM BL-OS4 Smartphone Replacement Battery 3.7V 1000mAh 4FA50 and a 1 year warranty—yourNGM W13 NM8819 Clio Dandy Joy 3. 7V Li ion Replacement Battery (BL OS4) This is a 3. 7V Li ion cell rated at 1000mAh (3. 7Wh), built to the BL OS4 specification. It fits the NGM W13 NM8819 and a range of related NGM handsets including the Clio, Dandy, and Joy. If your original cell no longer holds a charge or the phone shuts down unexpectedly, this is the direct swap. W13 NM8819 Clio Dandy Joy platform fit: These NGM handsets share the same battery