Battery; Battery Status Indicator; Battery Capacity - Laerdal Serres Guia Del Usuario

Battery

The LSU can be operated from the internal battery, and can be operated or charged
from one of the following external power sources:
AC mains when used with the AC Power Cord: 100-240 VAC (50/60 Hz).
DC mains when used with the DC Power Cord: 12-28 VDC.
The LSU battery can also be charged in an optional External Battery Charger. A Wall
Bracket to hold the LSU during operation and (optional) charging is available separately.
See Accessories and Parts for more information.

Battery Status Indicator

This Battery Status Indicator has 3 functions:
• During operation from internal battery: indicates approximate remaining battery
capacity.
• During charging: indicates approximate achieved battery capacity.
• During device testing: indicates which device test is in progress.
If no battery is installed, the battery status indicator will be fully lit for approx. 5 sec. until
it is turned off.
Note
During operation from internal battery and during charging, the displayed values must only
be used as indications.

Battery Capacity

Capacity
< 75%
75 - 80%
> 80%
Immediately after turning the LSU on or switching from external power to internal
battery operation, all 4 LEDs will flash for 5 seconds before the remaining battery
capacity is displayed. Due to the nature of voltage based battery capacity measurement,
the battery status indication may differ from unit to unit. Each battery may vary in voltage
versus remaining capacity, thus allowing for variability in the reading. Other outside
variables such as temperature may also affect accuracy. The indicator is targeted to show
battery capacity as indicated below. The graph shows how the accuracy of the indication
can vary.
4 LEDs
3 LEDs
2 LEDs
1 LED
Caution
If the LSU or the NiMH battery has been stored at low temperatures (< 12 °C / < 54 °F),
the LSU may indicate lower remaining battery capacity than actual when first switched on.
This is due to the nature of NiMH batteries. The battery indicator may flash on one
LED, which normally indicates Battery Low. The LED may continue to flash until the LSU
temperature is above 12 °C / 54 °F and the LSU is switched off and on again. The low
battery indication in this instance is not a correct indication of the residual battery capacity.
Output
The LEDs will be lit sequentially
3rd LEDs lit and 4th flashing
4 LEDs lit
time
18