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3-1 Vanadium Pentoxide Lithium Coin Type Batteries (VL series)
Vanadium Pentoxide Lithium Rechargeable Batteries (VL series)
Features
These completely new coin-type lithium batteries feature vanadium oxide for the positive pole, lithium alloy for the negative pole and a non-aqueous solvent for the electrolyte.
Chapter 3
Construction
Vanadium Pentoxide Lithium Coin Type Batteries (VL series)
Applications
● Memory backup power supplies for offi ce automation equipment (personal computers, fax audio-video equipment (VTRs, etc.), communications equipment (mobile phones, etc.), etc.
● Hybrid systems with solar batteries (solar remote con- General Specifi cations
Electrical characteristics (20°C) Dimensions (mm)
Model No.
Weight (g) JIS IEC
Nominal voltage (V) *Nominal capacity (mAh) Continuous drain (mA) Diameter Height
VL621 3 1.5 0.01 6.8 2.1 0.3 - -
VL1216 3 5.0 0.03 12.5 1.6 0.7 - -
VL1220 3 7.0 0.03 12.5 2.0 0.8 - -
VL2020 3 20.0 0.07 20.0 2.0 2.2 - -
VL2320 3 30.0 0.10 23.0 2.0 2.8 - -
VL2330 3 50.0 0.10 23.0 3.0 3.7 - -
VL3032 3 100.0 0.20 30.0 3.2 6.3 - -
* Nominal capacity shown above is based on standard drain and cut off voltage down to 2.5V at 20°C.
Chapter 3- 56
Charging
■ Charging circuits
Approx. 1,000 times at 10% discharge depth to nominal capacity Constant-voltage charging.(Please strictly adhere to the specifi ed charge voltage) * Consult with Panasonic concerning constant-current charging systems. The charging circuit is crucial in terms of ensuring that full justice will be done to the battery characteristics. Consider it carefully as the wrong charging circuit can cause trouble.
■ Precautions regarding the charge voltage setting
Under no circumstances should trickle charging, which is used for nickel-cadmium batteries, be used. Ignoring this precaution will cause the battery voltage to rise to about 5V, resulting in a deterioration of performance.
Chapter 3
■ Charge voltage range
If a fi xed-charging method is applied, please adhere to the specifi ed charging voltage.
The guaranteed value over an operating temperature range from -20 to +60°C is 3.4V ± 0.15V. Vanadium Pentoxide Lithium Coin Type Batteries (VL series)
* If the charging voltage exceeds the specifi cations, the internal resistance of the battery will rise and may cause battery deterioration. Also,with a charge voltage around 4V, corrosion of the (+) terminal (case) may occur, causing leakage. ("Infl uence of the charge voltage on VL batteries" in Chapter 3-59.) * It is not possible for the battery capacity to recover completely when the charging voltage is below the ■ Recommended charging circuits
Charge current: For a battery voltage of 3V (It is permissible for the current to increase beyond the above level when the battery voltage drops below 3V.) ■ Mixed usage of batteries
Do not use these batteries and lithium primary batteries or other rechargeable batteries together, and do not use new batteries and old batteries together even if they are of the same type.
Chapter 3- 57
Charging
● Reference: Examples of 5-V charging circuits
For D2 , select a diode of small inverse current(IR=1 A below / 5V) Chapter 3
For D , select a diode of small inverse current (IR=1 A below / 5V) Vanadium Pentoxide Lithium Coin Type Batteries (VL series)
For minimizing current leakage due to resistance, etc., as when charging by another battery.
For details, refer to the constant voltage element specifications Select a diode having an inverse current as small as possible. (IR=1 A below / 5V) Chapter 3- 58
Charging
● Charging characteristics
4 Common to VL621 and VL1216 / Common to VL1220 VL2020 and VL2330 Temp. 20°C ● Infl uence of the charge voltage on VL batteries
If the charge voltage goes beyond its adequate range, battery performance may deteriorate early. Be sure to observe the guaranteed Chapter 3
Vanadium Pentoxide Lithium Coin Type Batteries (VL series)
The lower the charging voltage becomes,the less the capacity becomes.
Chapter 3- 59

Source: http://www.all-batteries.es/media/pdf/ABL6403_UK_2.pdf