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CHARGING METHODS - CONTINUED

  • Characteristics of constant voltage chargers

Even with the same voltage set-up, charging time varies with output V-I characteristics.

Output V-I characteristics of the constant voltage charger vs. Charging pattern of the battery

V

V

V

V

I

I

I

Time

I

Time

V

V

V

V

I

I

I

Time

I

Time

Constant voltage charger circuitry (Concept diagram)

TR

0.8A

D

15.5V

2A

R

R

33K

1.2K

1/4W

1/4W

Example of constant voltage circuit

A.C. 100V

D 2A

LED

D 1.2V

C

50V 470uF

D

Q

R 5.6K 1/4W

Q

R

5.6K 1/4W

Q

1.2

ZD

R

5V

1K

R1/4W

500W

1/4W

R56 1/4W

Q

C

50V 10,000PF

R56 1/4W

Q

R

R

1K

1/4W

VR

D 1A 200V

2.2K 1/4W

C 25V 47uF

500 0.1W

Precautions

  • 1)

    When adopting charging methods and charging conditions other than those described in the specifications or the brochures, thoroughly check charging/discharging characteristics and life characteristics of the battery in advance. Selection of appropriate methods and conditions of charging is essential for safe use of the battery and for fully utilizing its discharge characteristics.

  • 2)

    In cyclic use of the battery, use a charger equipped with a charging timer or a charger in which charging time or charge amount is controlled by other means; otherwise, it will be difficult to judge the completion of the charge. Use of a charger as described above is recommended to prevent undercharge or overcharge which may cause deterioration of the battery characteristics.

  • 3)

    Continue charging the battery for the specified time or until the charge completion lamp, if equipped, indicates completion of charging. Interruption of charging may cause a shortening of service life.

  • 4)

    Do not recharge the fully charged battery repeatedly, as overcharge may accelerate deterioration of the battery.

  • 5)

    In cyclic use of the battery, do not continue charging for 24 hours or longer, as it may accelerate deterioration of the battery.

  • 6)

    In cyclic service of the battery, avoid charging two or more batteries connected in parallel simultaneously: imbalance of charge/discharge amount among the batteries may shorten the life of batteries.

Sealed Lead-Acid Handbook, Page 25

January 2000

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