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Appendix B
Internal Battery
When the optional internal Nickel Metal Hydride (NiMH) battery is powering your Gecko
recording system, to protect the battery from over-discharge the a Low Voltage Disconnect
(LVD) circuit is enabled to cut power to the Gecko if the battery voltage drops too low.
The battery pack is expected to run Gecko sensor models for several hours, with backup
time depending on Gecko model and the state of battery charge when AC power is
disconnected. When power is reconnected after the battery is discharged, the battery should
be fully charged in around 6 hours while the Gecko is operating, after which time the
regulator will keep a small float current flowing to the battery that will offset the power the
system draws while running.
Float
Charging
New 1650mAH
NiMH Battery
Discharge and
Recharge Test
(using Gecko SMA-HR)
The battery pack is supplied with a 12V power supply plug pack that is compatible with 110-
250V AC power sources, along with a NiMH charge regulator which is programmed to
charge to battery pack in such a way as to maximise the life of the battery. The internal
battery pack can still be charged even if the Gecko itself is switched off.
The AC plug pack outputs a DC voltage, but the charge regulator accepts power from any
type of DC power source, from 10V to 70V DC. We recommend that the power rating of
your DC supply should be at least 24W (2A @ 12V DC).
AC power
disconnected
Constant
Current
Charging
Fully charged battery gives SMA-HR
more than 12 hours backup run time
37
Constant
Voltage
Charging
Gecko
switches
off to
protect
battery.
AC power
connected
SMA-HR running.
Fully recharged in
around 6 hours
Float
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