6.5.13 Lead-Acid Batteries
In electric beds with at least two actuators, rechargeable lead-acid batteries are used in an emer-
gency to operate the electrical actuator system independently of the mains electricity supply. This
guarantees that all motorised adjustments can be carried out even during a power failure.
Emergency Operation
When the bed is occupied by a patient of normal weight (approx. 80 kg), adjustments can be made
for approx. 6-10 minutes if the lead-acid battery is new and fully charged.
Under emergency conditions, if the battery capacity is depleted, an alarm will sound during ad-
justments.
If the battery capacity is depleted, all adjustment functions are locked out in order to prevent the
battery from becoming completely discharged, as this could shorten the battery's life.
In this case, take the following action to optimise the battery life:
Plug the bed into the mains power supply as soon as possible to recharge the battery
Avoid attempting repeated motorised adjustments that would discharge the battery even
more.
Recharging/ Battery Charge Indicator
The lead-acid batteries are fully charged when the bed has been connected to the mains supply
for at least 8-10 hours.
It is impossible to overcharge the lead-acid batteries.
During the charging process, the bed can be adjusted using the handset or the locking box.
The lead-acid batteries have a limited service life. In normal use, this service life is approximately
five years. Batteries need to be replaced when operation cycles become very short. For safety
reasons, at least one more height adjustment (up + down) should always be possible under normal
load. Otherwise, the lead-acid batteries must be replaced.
In this case, contact Stiegelmeyer’s Service Centre. We will replace the rechargeable lead-acid
batteries and dispose of the old batteries properly.
When the bed is connected to the mains electricity supply, a yellow LED on the control box or lock-
ing box indicates that the battery is charging.
Yellow LED off: Battery charging completed / bed is disconnected from power supply
Yellow LED on: Battery is charging / bed is connected to power supply
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