Avision IS25 manual - Manual (Page 18)

3.1 Installing the battery
To install the battery into the scanner,
1. Open the battery cover underneath the scanner.
2. Load the battery into the battery container. Make sure
the battery is loaded with the correct polarity. Note the
copper strips on the battery should be touching the
copper strips on the device inside the battery container.
Note:
The recommended battery model is NP120 for 3.7V
1700mAh/6.29Wh.
3-2