Based on this product's specifications, here are some alternatives and similar models
Replacement battery Newland BTY-MT65 3.7V 2500mAh for mobile devices and barcode scanners
Summary description:
Replacement battery Newland BTY-MT65 with 3.7V nominal voltage and 2500mAh capacity. Designed as a spare power source for compatible mobile devices and Newland barcode scanners using the BTY-MT65 pack. Provides extended runtime for fieldwork, retail scanning, inventory counting and on-the-go applications. Simple swap-in installation and compatible charging via the device's original charger.