INFICON 2020ComboPRO Portable Photoionization Detector - Manual (Page 88)

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7. It is normal for a fully charged battery pack to indicate it is charging
(red light) when first plugged in. The LED will turn green within a few
minutes to indicate the battery is fully charged.
8. When the battery pack is fully charged, remove the DC power cord, first
from the vehicle auxiliary 12 VDC or cigarette lighter socket, then from
the off-line charger.
9. Remove the battery pack connector from the socket on the off-line
charger.
10. Replace the battery pack in the 2020ComboPRO as outlined in Battery
Charging on page 39.
You can keep the battery pack fully charged indefinitely, without overcharging it, by
leaving it connected to the off line charger while the charger is operating.