★★★★★
Lost power six times last winter during ice storms. Every time, the 3850 still opened the door and we got the cars out. Worth every penny over the standard belt drive.
Liftmaster
3850 Belt-Drive Opener with Battery Backup
Belt-drive opener with the integrated 485LM EverCharge battery backup — your door keeps working through power outages. Heavy-duty 12 V DC motor matches AC opener speed with DC quietness. Dual incandescent light bays, automatic spring-break detection, MVIS isolation.
$269.95
List $349.95
● In stock — ships in 2–3 business days
🛟 Free technical support
📄 Programming & FAQ
- ModelLiftmaster 3850
- DriveBelt drive · 12 V DC motor
- Battery backup485LM EverCharge integrated
- LightingDual incandescent (2 × 100 W max)
- SecuritySecurity+ 315 MHz rolling code
- Included373LM remote · 78LM control panel
In the box
- Liftmaster 3850 motor unit
- 485LM EverCharge battery (integrated)
- Reinforced belt-drive rail
- 78LM multi-function control panel
- 373LM 3-button remote
- Safety reversing sensors
- Mounting hardware & manual
Compatibility
Compatible doors, remotes, accessories, and code requirements. If your situation isn't listed, send us your details and we'll verify before you buy.
Door type
Sectional doors
Torsion or extension spring
Up to 7 ft tall standard · 8 ft optional
Required for code in
California (SB-969)
Texas wildfire-prone areas
Hurricane-zone Florida codes
California buyers — the 3850's integrated battery backup satisfies SB-969, which has required automatic battery backup on all residential garage door openers sold or installed in California since July 2019. Skip the standalone 475LM retrofit.
Programming the 3850
New 3850 units ship with the purple Security+ learn button. Pair remotes and keypads with the procedure below.
- Press the purple learn button on the back of the motor unit. The indicator light stays on for 30 seconds.
- Within 30 seconds, press and hold the desired button on your remote until the motor light blinks twice.
- Repeat for each additional remote — capacity is 8 remotes plus 1 wireless keypad.
The integrated EverCharge battery requires no separate setup — it begins charging the moment the opener is plugged in. Battery indicator on the control panel reports state of charge and replacement status.
What customers say
★★★★★
California requires battery backup now. Bought the 3850 instead of paying separately for a 3280 + 475LM. Cleaner install and one less thing to mount.