CR2477 Panasonic - BSG, CR2477 Datasheet - Page 3

• Manufacturer Part Number: CR2477
• Description: BATTERY LITHIUM COIN STD 3V 24MM
• Manufacturer: Panasonic - BSG
• Series: CR2477r

Specifications of CR2477

• Battery Cell Size: Coin 24.5mm
• Voltage - Rated: 3V
• Capacity: 1000mAh
• Size / Dimension: 0.96" Dia x 0.30" H (24.5mm x 7.7mm)
• Termination Style: Requires Holder
• Rechargeability: No
• Discharge Current: 0.2mA
• Operating Temperature: -30°C ~ 60°C
• Weight: 0.37 oz (10.49g)
• Lead Free Status / RoHS Status: Lead free / RoHS compliant by exemption
• Other names: CR-2477; CR-2477/BN; CR2477/BE; P120

Coin-type lithium batteries are often used as the power
supplies for memory backup in various equipment. However
problems with the erasure of valuable data in the memory
due to improper contact between the batteries and
equipment can occur.
This information is generally descriptive only and is not intended to make or imply any representation, guarantee or warranty with respect to any cells and batteries. Cell and battery designs/specifications
are subject to modification without notice. Contact Panasonic for the latest information.
1. When batteries are to be used continuously for a
2. When batteries need to be replaced in the short
Note: Do not touch batteries with bare hands because
Memory Erasure Problems
prolonged period
term, select batteries with no terminals or lead wire
connectors.
Select tab terminal-mounted batteries, and solder
the tabs to the battery connection terminals of the
equipment. (See Fig. 1)
When batteries need to be replaced, use a battery
holder (see Fig. 2) or battery with lead wire
connectors (see Fig. 3).
Use of Y-shaped terminals (2-point contact) for
both the (+) and (-) poles as the shape of the
connection terminals in the equipment helps to
achieve a more stable contact. (See Fig. 4)
The contact pressure of the contacts should be no
less than 2 to 10N (approx. 200 to 1000 gf). (See
Fig. 5)
To prevent momentary contact failure of several
milliseconds in the circuit, the use of a tantalum
capacitor, etc. with a capacitance of several
microfarads is effective. (See Fig. 6)
For the connection terminals of the equipment,
use iron or stainless steel with nickel plating at the
very least. Gold-plating is more suitable when the
contact resistance must be reduced.
perspiration (salt), body oil etc. will increase the
surface resistance which may lead to defective
contact.
Preventing Quality Problems
LITHIUM HANDBOOK
Fig. 4
Fig. 5: load
Fig. 6
Fig. 1: soldering
Fig. 2
Fig. 3
2~10N
IC
AUGUST 2005