"The battery has <b><span style="color:red;">(a)</span></b> full charge."<br/> "The battery has <b><span style="color:red;">(a)</span></b> 40% charge."<br/><br/> "The battery is at <span style="color:red;">(a)</span> full charge."<br/> "The battery is at <span style="color:red;"><b>(a)</b></span> 40% charge."<br/><br/> "The radio needs a battery with <span style="color:red;">(a)</span> full charge."<br/> "The radio needs a battery with <span style="color:red;"><b>(a)</b></span> 40% charge."<br/><br/> Do I need the article "a" in these sentences?