Spectra Precision SP90m - Using an External Battery

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On the charger, beside each slot are two LED indicators
(red and green) to display the battery status.
Using an External
Battery
When used in the field as a roaming base, the SP90m may
be powered from a standard car battery for example, provided
you take these precautions:
• Connect the receiver to an external battery, using an SAE-
terminated cable with electric wires all certified UL 758
and CSA C22.2 No. 210, or similar.
• The minimum wire section should be AWG 18.
• The cable should include a 5-A fuse placed in series. The
fuse should be certified “UL listed” and CSA certified 3-
30 A (or equivalent).
Status Red Green
No battery detected
(no battery present or battery defect)
On Off
Battery detected (charging not started yet)
- Conditioning not required
- Conditioning required
Off
Blinking
Off
Off
Charging in progress
- Conditioning not required
- Conditioning required
- Over/under temperature (charge is inhibited)
Off
Blinking
1 flash / 25 s
Off
Blinking
Blinking
Conditioning in progress On Blinking
Conditioning done (battery fully charged) On On
Battery fully charged
- Conditioning not required
- Conditioning required
Off
Blinking
On
On
Power supply over/under voltage Off 1 flash / 25 s