I am not familiar with your particular charger. But you can certainly charge a 1400 mAh pack at one amp. It should take about 1.4 hours (perhaps a little longer) to charge it fully, assuming it was totally discharged to begin with. Typical charging current for 1400 mAh pack would be 140 mA for ten hours (slow charge) or 1.4 amps for one hour (fast charge).