Panasonic HHR160A manual Storage characteristics, Cycle Life Characteristics, Safety

NICKEL METAL HYDRIDE BATTERIES - CONTINUED

•Discharge temperature characteristics at 1C discharge

	2.0
	1.8						Charge		: 1CmA x 1.2h
							Temperature: 20˚C
							Model		: HHR160A
(V)	1.6			20˚C
	1.4
Voltage
	1.2
	1.0		-10˚C
				0˚C
	0.8
	0.6
		20	40	60	80	100		120	140	160
	0

Charge Capacity (%) (Nominal Capacity Ratio)

•Discharge temperature characteristics

	120
	100
(%)	80			1C
Ratio
	60			3C
Capacity	40			Temperature: 20˚C
				Charge	: 1CmA x 1.2h
	20			Discharge	: Cut-off Voltage 1.0V
				Model	: HHR160A
	0
	-20	-10	0	10	20	30	40	50

Discharge Temperature (˚C)

Storage characteristics

These characteristics include self-discharge characteristics and restoration characteristics after long-term storage. When batteries are left standing, their capacity generally drops due to self-discharge, but this is restored by charge.

•Self discharge characteristics

	100
	90				Temp.: 20˚C
(%)	80
					Ni-MH (HHR160A)
Ratio
	70				Temp.: 45˚C
Capacity	60
	50			Ni-Cd (P-120AS)
	40	Charge	: 1CmA x 1.2h
		Discharge: 1CmA to 1.0V/cell
	30	1	2	3	4
	0

Storage Period (weeks)

Self-discharge is affected by the temperature at which the batteries are left standing and the length of time during which they are left standing. It increases in proportion as the temperature or the shelf-standing time increases. Panasonic’s nickel-metal hydride batteries have excellent self-discharge characteristics that are comparable to those of Ni-Cd batteries.

Cycle Life Characteristics

The cycle life of these batteries is governed by the conditions under which they are charged and dis- charged, temperature and other conditions of use.

Under proper conditions of use (example: IEC charge and discharge conditions), these batteries can be charged and discharged for more than 500 cycles.

•Cycle life characteristics

	120				Temperature : 20˚C
	100				Model		: HHR160A
(%)	80
Ration
	60
Capacity
	40
	20
	0	100	200	300		400		500

Number of Cycles (cycle)

Safety

When the internal pressure of these batteries rises due to overcharge, short-circuiting, reverse charge or other abuse or misuse, the self-resealing safety vent is activated to prevent battery damage. Panasonic’s nickel-metal hydride batteries have similar safety characteristics as Panasonic Ni-Cd batteries.

NICKEL METAL HYDRIDE HANDBOOK, PAGE 11 August 2000