M

L

13

Charging at a higher voltage could cause the generation of gas,

internal short-circuiting, or other malfunctions, leading to distortion,

leakage, overheating, explosion, or fire. For details, see the

recommended circuits below.

Large surges of current could degrade the battery’s characteristics,

leading to distortion, leakage, overheating, explosion, or fire. To

avoid excessive current at the initiation of charging, make sure to

attach a protective resistor for current control. See the

recommended circuits below.

(How to select a protective resistor for the current control)

The maximum charge current flows in the battery when charged at

an end voltage of 2V. Therefore, the value of the resistor is

calculated using this equation:

(R) >

= ((Output Voltage of Voltage Regulator) – 2) / (Nominal Charge

Current)

For example, the S-812C series, which has a maximum input voltage

of 18V, or the S-817 series with a maximum input voltage of 10V

(Seiko Instruments Inc.) can be used as a voltage regulator.

Note 1: If the main power source voltage is stable, the charge

voltage can be allotted from main power source divided by the

combination of resistors.

Note 2: Because the battery height must be changed by charge and

discharge cycle, place a minimum of 1mm space between the

battery and device or chassis.

If the battery is over-discharged to below the specified voltage

(2.0 V), it may not be rechargeable.

Please refer to the representative basic circuits shown below.

If you have any questions about circuit design, please feel free

to contact Maxell.

Model

Table 1 Nominal Charge Current by Model

Fig. 1 Charge Property

Charge Current

ML2032

2mA or lower

ML2016

2mA or lower

ML1220

1mA or lower

D: Diode, R: Resistor

Load

(3.0-3.3V)

ML

R

D

–

+

GND

Voltage

Regulator

To 16V

3.2V

>600 ohm

>600 ohm

>1.2K ohm

3.1V

>550 ohm

>550 ohm

>1.1K ohm

Model

ML2032

ML2016

ML1220

Output Voltage of Voltage Regulator

Table 2 Example of resistors

The battery may be

regulated by national or

local regulation. Please

follow the instructions of

proper regulation. As

electric capacity is left in

a discarded battery and it

comes into contact with

other metals, it could lead

to distortion, leakage,

overheating, or explosion,

so make sure to cover the (+) and (–) terminals with friction tape or

some other insulator before disposal.

Exposing the battery to ultrasonic sound may cause short-circuiting

because the inside material is broken into pieces, leading to

distortion, leakage, overheating, explosion, or fire.

Dropping, throwing or stomping on the battery may cause distortion,

leakage, overheating, explosion, or fire.

The battery may not be suitable for the specific equipment due to

the using conditions or type of equipment. Please select the suitable

battery according to the handling instructions of the equipment.

direct rays of the sun or in a car in hot weather.

If you do, this may cause distortion, leakage, overheating, explosion,

or fire.

If it does, this may cause the battery to rust or lead to distortion,

leakage, overheating, explosion, or fire.

Doing so may cause the performance of the battery to deteriorate. In

certain environments, this may lead to distortion, leakage,

overheating, explosion, or fire.

(Example of

battery insulation)

Battery

+

–

Tape

Do not pile up or mix

batteries.

Enlarged view

Electric current flows.

These batteries generate heat.

Warnings — Circuit Design

Caution — Handling/Storage

Warnings — Disposal

Charge voltage (V)

0

2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5

20

40

60

80

100

Recommended

area

Prohibited

area

Temp: 20deg.C

FV = 2.0V

SR