MANGANESE LITHIUM RECHARGEABLE BATTERIES (ML SERIES)
• Large capacity for hour-after-hour back-up
The ML621 has a nominal capacity of 3 mAh, and
These super-compact lithium secondary batteries feature
when the load is 5µA, it provides back-up for 600
a new configuration in which a manganese compound
oxide is used for the positive electrode, a lith-
• Excellent withstand voltage characteristics
ium/aluminum alloy for the negative electrode and a
These batteries can withstand the application of a
special nonaqueous solvent for the electrolyte. They can
continuous 3.2V voltage at a high temperature of
be charged at voltage levels of 3V or so, they have a
large capacity and excellent overcharge and over-
• Outstanding overcharge and overdischarge with-
discharge withstanding characteristics. Their space-
standing characteristics.
saving design enables them to be incorporated quite
Even when these batteries have been left standing
for a long time with no charge at all, their perfor-
mance can be restored by recharging them.
• Charging at voltage levels even under 3V
In order to support the current trend in ICs toward
Power source for backing up memory data in mobile
lower voltages, these batteries can be charged at a 3±
telephones, personal handyphone systems, memory
0.2 voltage level, and this makes it easier to set the
cards, pagers and other small-sized communications
charging circuits for the circuits which employ 3V
devices as well as in data terminals and office
Electrical characteristics 20°C Continuous Dimensions (Max.) Nominal *1 Model No. capacity voltage (V) Standard Diameter
* 1 Nominal capacity shown above is based on standard drain and cut off voltage down to 2.0 V at 20°C
About 1,000 times at 10% discharge depth to nominal capacity
Constant-voltage charging (refer to recommended charging circuit)
Lithium Batteries Handbook, Page 57 December1998 MANGANESE LITHIUM RECHARGEABLE BATTERIES – CONTINUED Discharge characteristics Discharge load characteristics (ML621S) Discharge temperature characteristics (ML621S)
Discharge: 200k (=12µA), cut-off at 3.1V
Charge/discharge characteristics vs. discharge depth (ML621S)
Discharge depth (%) as a function of nominal capacity
Lithium Batteries Handbook, Page 58 December1998 MANGANESE LITHIUM RECHARGEABLE BATTERIES – CONTINUED Storage characteristics (ML621S) Withstand voltage characteristics (Overcharge characteristics) (ML621S) Overdischarge withstanding characteristics Relationship between charging voltage and charge (ML621S) acceptance Relationship between current consumption and Constant-voltage charging characteristics (ML621S) charge retention time Lithium Batteries Handbook, Page 59 December1998 RECOMMENDED CHARGING CIRCUIT
The choice of the charging circuit is extremely critical if
Basic conditions: Constant-voltage charging
full rein is to be given to the battery characteristics.
Charging voltage: 2.8 to 3.2V (Standard voltage: 3.1V)
Make every effort to ensure that the proper charging
Current: (0.3mA for ML616. ML621 with 2.5V battery
circuit is used; otherwise, trouble may result.
(Use caution in setting the charge voltage.)
When charging using another battery Standard circuit
• Select a diode with a low reverse current for D2. Simple circuit which can be configured at low cost
* VF of D will be different from the value given above if a current in excess of 100µA flows to the loadduring operation. Compensation must be provided by the resistors in such cases.
UL recognition for the ML621 and ML616 was received
When a protective component is shorted or opened,
maximum charge current is regulated to the followingvalues:
In filling application for UL recognition, a maximum
value of 300mA was given as the condition restricting
the current when a short-circuit or open-circuit situation
Call Panasonic for answers to specific questions aboutUL. Lithium Batteries Handbook, Page 60 December1998
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