Panasonic VL2020 3V Rechargeable Lithium Coin Cell Battery | BMW Remote Key Fob | 1 Pack

• Battery Type: Rechargeable lithium coin cell battery employing vanadium pentoxide cathode, lithium alloy anode, and non-aqueous solvents in the electrolyte solution
• Nominal Voltage: 3.0 V
• Charging Voltage: 3.25 V to 3.55 V
• Capacity: 20.0 mAh (nominal); continuous drain 0.07 mA
• Chemistry: Lithium Vanadium Pentoxide (Li/V₂O₅)
• Rechargeable: Yes — charges automatically via the vehicle's ignition circuit while driving
• Cycle Life: Up to 1,000 charge/discharge cycles at 10% discharge to nominal capacity
• Dimensions: 20.0 mm diameter × 2.0 mm height
• Weight: Approximately 2.10 g
• Self-Discharge Rate: Approximately 2% per year — low enough for use without recharging after long storage periods
• Shelf Life: Up to 5 years
• Operating Temperature: –20°C to +60°C
• Terminal Configuration: Solder tabs (90° or 180° depending on variant) — requires professional soldering for installation; battery must be desoldered from PCB and new unit soldered in place
• Pack Size: 1 battery
• BMW Compatibility: BMW 1, 3, 5 Series, X3, X5, Z4, X6 (chassis codes E46, E60, E61, E63, E64, E70, E71, E72, E81, E82, E84, E87, E88, E89, E90, E91, E92)
• Typical Uses: Remote key fobs, memory backup for PCs, AV equipment, and hybrid systems with solar batteries; office automation equipment