Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
ASIMO
Table title:
Specifications
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Model </th><th colspan=1 rowspan=1 > 2000, 2001, 2002 </th><th colspan=1 rowspan=1 > 2004 </th><th colspan=1 rowspan=1 > 2005, 2007 </th><th colspan=1 rowspan=1 > 2011 </th></tr>
<tr> <td colspan=1 rowspan=1 > Mass </td><td colspan=3 rowspan=1 > 54 kilograms (119 lb) </td><td colspan=1 rowspan=1 > 48 kilograms (106 lb) </td></tr>
<tr> <td colspan=1 rowspan=1 > Height </td><td colspan=1 rowspan=1 > 120 centimetres (47 in) </td><td colspan=3 rowspan=1 > 130 centimetres (51 in) </td></tr>
<tr> <td colspan=1 rowspan=1 > Width </td><td colspan=4 rowspan=1 > 45 centimetres (18 in) </td></tr>
<tr> <td colspan=1 rowspan=1 > Depth </td><td colspan=1 rowspan=1 > 44 centimetres (17 in) </td><td colspan=2 rowspan=1 > 37 centimetres (15 in) </td><td colspan=1 rowspan=1 > 34 centimetres (13 in) </td></tr>
<tr> <td colspan=1 rowspan=1 > Walking speed </td><td colspan=1 rowspan=1 > 1.6 kilometres per hour (0.99 mph) </td><td colspan=1 rowspan=1 > 2.5 kilometres per hour (1.6 mph) </td><td colspan=2 rowspan=1 > 2.7 kilometres per hour (1.7 mph) </td></tr>
<tr> <td colspan=1 rowspan=1 > Running speed </td><td colspan=1 rowspan=1 > N/A </td><td colspan=1 rowspan=1 > 3 kilometres per hour (1.9 mph) </td><td colspan=1 rowspan=1 > 6 kilometres per hour (3.7 mph) (straight) 5 kilometres per hour (3.1 mph) (circling) </td><td colspan=1 rowspan=1 > 9 kilometres per hour (5.6 mph) </td></tr>
<tr> <td colspan=1 rowspan=1 > Airborne time (Running motion) </td><td colspan=1 rowspan=1 > N/A </td><td colspan=1 rowspan=1 > 0.05 seconds </td><td colspan=2 rowspan=1 > 0.08 seconds </td></tr>
<tr> <td colspan=1 rowspan=1 > Battery </td><td colspan=1 rowspan=1 > Nickel metal hydride 38.4 V, 10 Ah, 7.7 kilograms (17 lb) 4 hours to fully charge </td><td class="highlighted"  colspan=3 rowspan=1 > Lithium ion 51.8 V, 6 kilograms (13 lb) 3 hours to fully charge </td></tr>
<tr> <td colspan=1 rowspan=1 > Continuous operating time </td><td colspan=1 rowspan=1 > 30 minutes </td><td class="highlighted"  colspan=2 rowspan=1 > 40 mins to 1 hour (walking) </td><td colspan=1 rowspan=1 > 1 hour (running/walking) </td></tr>
<tr> <td colspan=1 rowspan=1 > Degrees of Freedom </td><td colspan=1 rowspan=1 > 26 (head: 2, arm: 5×2, hand: 1×2, leg: 6×2) </td><td colspan=2 rowspan=1 > 34 (head: 3, arm: 7×2, hand: 2×2, torso: 1, leg: 6×2) </td><td colspan=1 rowspan=1 > 57 (head: 3, arm: 7×2, hand: 13×2, torso: 2, leg: 6×2) </td></tr>
<tr> <td colspan=1 rowspan=1 > Languages </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > English & Japanese </td></tr>
<tr> <td colspan=1 rowspan=1 > Images </td><td colspan=1 rowspan=1 > - </td><td colspan=2 rowspan=1 > 2005 Honda ASIMO 01.JPG </td><td colspan=1 rowspan=1 > - </td></tr>
</table>
Question:
What is the battery that powers the ASIMO and how long does it last?
Answer:
ASIMO is powered by a rechargeable 51.8 V lithium-ion battery with an operating time of one hour.