Zebra Technologies RW 220, RW 420 manual Charging process per the following table

the charging process per the following table:

UCLI72-4Battery Status Indicators

Amber LED	Green LED	Battery Status
On	Off	Charging
On	Flashing	80% charged (O.K. to use)
Off	On	Completely Charged
Flashing	Off	Fault

Important • A fault condition is caused by a problem with the battery. The charger may indicate a fault because the battery is too hot or too cold to charge reliably. Try to charge the battery again when it returns to the room’s ambient temperature. If the Amber indicator starts flashing on the second charging attempt, the battery should be discarded. Always dispose of batteries in a proper manner. Refer to Appendix E

LI72-4 Charger Cycle Times :

RW 420

RW 220

Battery 80% Charged	2.5 Hrs.	1.25 Hrs..
Battery Fully Charged	5 Hrs..	2.5 Hrs..

Note • Charge times are for completely discharged batteries.

Partially discharged Battery Packs will take less time than listed in the chart to reach a fully charged state. Once Battery Packs have reached 80% of their charge capacity they may be used, but it is recommended that you allow the batteries to reach a full charge to maintain maximum battery life.

Note • The UCLI72-4 Quad Charger’s safety features will stop the battery charging process after six hours regardless of the battery’s charge state.

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RW Series User Guide