NX-3000 Series - K11
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Power Products BPKNB57LIXT Battery - 7.4V, 2300mAh, 17.0Wh, Li-IonBPKNB57LIXT$84.95 As low as $81.95Power Products - Usually ships in 5-7 Days
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Power Products PMKNB78LIP Battery - 7.4V, 3000 mAh, LiPoPMKNB78LIP$98.95 As low as $94.95Power Products - Usually ships in 5-7 Days