Restore reliable remote access without replacing your key. This rechargeable 3V VL2020/HFN replacement battery with a 90degree contact design is made to fit E81, E82 and E90 keyless entry keys and bring your key fob back to full function quickly and safely. Key benefits Restores keyless entry performance — replaces worn or dead batteries so locking, unlocking and other remote functions work reliably. Rechargeable design — reduces waste and the need for disposable batteries, letting you recharge the cell rather than replacing it as often. Precise fit — VL2020/HFN model with a 90degree contact orientation designed to match the contact layout of compatible key housings for straightforward replacement. Key attributes Voltage: 3V nominal Model/Compatibility: VL2020 / HFN replacement battery for E81 E82 E90 keyless entry keys Orientation: 90degree contact design for correct alignment in the key housing Form: Compact replacement battery designed to fit key fob compartments Functionality: Restores remote locking/unlocking and other keyless functions when the original battery is worn How this battery solves common problems Dead or weak key batteries are the most frequent cause of nonresponsive keyless entry. Swapping to this compatible VL2020/HFN rechargeable battery restores normal operation without having to or reprogram the key. The rechargeable design lowers long‑term cost and environmental impact compared with singleuse cells. Typical use cases a worn battery in an E81, E82 or E90 keyless entry key to restore lock/unlock and alarm control. Keep as a spare in your glovebox or toolbox for quick roadside replacement when the key fob battery dies. Stock for automotive service or locksmith use when servicing multiple Eseries key fobs. Installation tips Confirm your key model matches E81, E82 or E90 keyless entry key before . Observe the 90degree contact orientation when installing to ensure proper electrical contact and reliable operation. If you are unsure about opening the key housing, consult the vehicle's manual or a professional service to avoid damage. A straightforward, compatible replacement designed to get your key fob working again — rechargeable 3V VL2020/HFN with a 90degree contact layout for E81, E82 and E90 keyless entry keys.