Brother PT-H300 - Manual (Page 69)

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Specifications
Rechargeable Li-ion Battery
Labeling System
• Charging current: 500 mA
• Charging voltage: up to 8.2 V (Maximum)
Surroundings temperature range
Charge 104°F
Standard discharge current 1.9 A 140°F
Maximum discharge current 2.5 A 140°F
Shipped battery
Less than 1 month -4°F - 122°F
Less than 3 month -4°F - 104°F
Less than 1 year -4°F - 68°F
Charging Parameters
Maximum charging voltage 8.2 Vdc
Maximum charging current 1330 mA