Power Module

Battery Information
Can I suggest a code change here:

```php
	    // Bits 0...4 => day (value 1-31; 5 bits)
	    // Bits 5...8 => month (value 1-12; 4 bits)
	    // Bits 9...15 => years since 1980 (value 0-127; 7 bits)

	    $mfgday = $this->manufacture_date & 31;
	    $mfgmonth = ($this->manufacture_date >> 5) & 15;
	    $mfgyear = (($this->manufacture_date >> 9) & 127) + 1980;
	    $this->manufacture_date = sprintf("%d-%02d-%02d\n", $mfgyear, $mfgmonth, $mfgday);
```