Upon connection to a cell, the cell board LED blinks a code, repeated three times:


<table border=1>
	<tr>
		<th>Blinks
		<th>Meaning</td>
	<tr>
		<td>None
		<td>Dead
	<tr>
		<td>2
		<td>OK
	<tr>
		<td>3
		<td>C+ shorted to B+
	<tr>
		<td>Stay on
		<td>Bad cell board
</table>

During use, the cell board LED blinks a code:


<table border=1>
	<tr>
		<th>Blinks
		<th>Meaning</td>
	<tr>
		<td>1 / second
		<td>OK
	<tr>
		<td>1 / second twice, then long pause, repeat
		<td>Bad bank somewhere in the battery
	<tr>
		<td>Stay on
		<td>Balancing
</table>