Brother QL-810W Ultra-Fast Label Printer with Wireless Networking - Manual (Page 212)

Using the Optional Battery Unit (Rechargeable Li-ion Battery included)
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Product Specifications
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Rechargeable Li-ion Battery Unit
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Size: approx. 4.92" (W) x 7.76" (D) x 2.72" (H) (125 mm (W) x 197 mm (D) x 69 mm (H))
Weight: approx. 1.31 lb (0.59 kg)
Voltage: 14.4 V
Capacity: 1750 mAh
Charging/discharging cycle: approx. 300 times
Charging time: approx. 2.5 hours