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# Charging Methods and Applications of SLA Batteries

Normal charging in 6 or more hours; Constant voltage control

Two-step constant voltage control

Control voltage : 7.25V to 7.45V /6V battery 14.5V to 14.9V /12V battery Initial current : 0.4 CA or smaller Control voltage : 6.8V to 6.9V /6V battery 13.6V to 13.8V /12V

Initial charging with current of approx. 0.15 CA, followed by switching

battery

voltage to trickle charge

Control voltage : 6.8V to 6.9V /6V battery 13.6V to 13.8V /12V battery Float charging compensates for load luctuations. When charging two or more

batteries at a time, select only those which have been left under the same condition. General uses, Cellular phones (bag phones), UPS, Lanterns, Electric tools

Application \ Charging Method

## Float use

R e f r e s h c h a r g e

(Auxiliary charge)*

Application example

Constant current control

Charging with current of approx. 0.1 CA

## (Precautions on charging)

• 1.

(a) in constant voltage charging (cycle use): Initial current should be 0.4 CA or smaller (C: rated capacity)

• (b)

in V-taper charge control system: Initial current should be 0.8 CA or smaller (C: rated capacity)

• (c)

in constant voltage charging (trickle use): Initial current should be 0.15 CA or smaller (C: rated capacity)

• 2.

Relation between standard voltage value in constant

voltage charging and temperature is given in the Table.

Trickle use

0C

25C

40C

4V

5.1

4.9

4.7

6V

7.7

7.4

7.1

8V

10.2

9.8

9.5

12V

15.4

14.7

14.2

4V

4.7

4.6

4.5

6V

7.1

6.8

6.7

8V

9.4

9.1

8.9

12V

14.1

13.7

13.4

voltage charging

and temperature

# Sealed Lead-Acid Handbook, Page 23

January 2000

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