Liftmaster 3850C, 3850 garage door opener battery, 12V 5Ah
⚡ Longer Runtime Upgrade
Our 5Ah battery is a direct replacement for the original 4.5Ah version. It fits and charges perfectly, with the added benefit of longer runtime between charges.
CB125-3850C Battery Replacement for LiftMaster 3850C, 3850 Garage Door Openers – 12V 5Ah AGM
Reliable Garage Access Starts with Reliable Backup Power
Don’t let a power outage leave you stranded. The CB125-3850C is a premium 12V 5Ah AGM battery engineered as a direct replacement for the backup system in LiftMaster 3850C and 3850 garage door openers. Whether you’re replacing an exhausted battery or preparing for unexpected blackouts, this maintenance-free battery ensures your opener works every time you need it.
- ✅ Stable Performance – Provides dependable backup power during outages or low-voltage conditions.
- ✅ Higher Capacity – 5Ah rating delivers longer runtime compared to common 4Ah replacements.
- ✅ Safe AGM Design – Sealed, spill-proof construction allows mounting in any orientation.
- ✅ Easy Drop-In Replacement – F1 terminals (3/16") make installation simple and secure.
⚙️ Technical Specifications
- Model Number: CB125-3850C
- Battery Type: Sealed Lead Acid (AGM)
- Voltage: 12V
- Capacity: 5Ah
- Connector Type: F1 Terminals (3/16" wide)
- Dimensions: 90mm (L) x 70mm (W) x 101mm (H), 107mm with terminals
- Weight: 1.6kg / 3.53 lbs
- Color: Black
- Maintenance-Free: Yes – install in any orientation
🔄 Simple Installation for LiftMaster 3850C & 3850
- Disconnect opener from AC power.
- Remove the battery cover panel.
- Take out the old unit and slide in the new CB125-3850C.
- Reconnect the red (+) and black (−) leads securely.
- Replace the cover and restore power.
⚠️ Battery ships without wires or adapters – reuse your original connectors.
🔁 Replaces Battery Models
1240, ABS12-4, BD4-12, CA1240, CT1240, E1240, Exaltor, Exaltor E1250, Exaltor GX-E1240, NP5-12, NX-6, PC1616, PC1832, PC1864, PC580, PC585, PE12v4.5, PS-1240, PX12050, SB1240, SEC1055, SLA4-12, SLA5-12, UB1245, UB1250, UT1240
✅ Compatible With
- Garage Door Openers: LiftMaster 3850C, LiftMaster 3850,
- Other Applications: Security systems, UPS backups, emergency lighting
🛡️ Peace of Mind Guarantee
- ✅ 30-Day Easy Return Policy
- ✅ 1-Year Replacement Warranty against manufacturing defects
🛒 Order Today
Restore the reliability of your LiftMaster 3850C / 3850 opener with the CB125-3850C replacement battery – dependable power when you need it most.
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💡 Shipping heavy or bulk items?
If your order includes multiple heavy products, we recommend requesting a custom quote — we may be able to arrange a better rate with a transport truck!
Please note: We reserve the right to send heavier items by transport truck if the carrier's maximum weight per package is exceeded or if we consider it too risky to place with a courier due to the possibility of damage occurring.
🔋 What’s mAh All About?
🔋 What’s mAh All About?
mAh stands for milliamp hours—basically, how much "fuel" your battery can hold. A higher or lower mAh than your original battery? No worries! 🙌 It won’t affect charging or operation—just means your device might run a bit longer or shorter between charges. Still 100% compatible. Still 100% awesome. 💪✨
Before ordering please read
Before ordering please read
Ensure the original battery model number is mentioned in our product description and verify that your device model number is also listed in the description.
How to Look after your new lithium battery!!
How to Look after your new lithium battery!!
See how to look after your battery if its lithium Lithium Care
Delivery and Shipping
Delivery and Shipping
See our shipping policy and details at this link Shipping Details
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📸 Send Us Your Battery Image
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We’ve helped thousands of customers find the right battery — let us do the same for you. Whether it’s for an alarm system, emergency light, or industrial equipment, we’ve got you covered.
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Specifications
| Product Information | |
|---|---|
| Category | Garage Door Opener Backup Battery |
| Model Number | CB125-3850C |
| Battery Type | Sealed Lead Acid (AGM) |
| Voltage | 12V |
| Capacity | 5Ah |
| Power Rating | 60Wh (approx.) |
| Connector Type | F1 Terminals (3/16") |
| Dimensions | 90mm (L) x 70mm (W) x 101mm (H), 107mm with terminals |
| Net Weight | 1.6kg / 3.53 lbs |
| Color | Black |
| Maintenance-Free | Yes – usable in any orientation |
| Compatible Models | |
| LiftMaster 3850C, LiftMaster 3850, plus use in UPS systems, emergency lights, and security systems | |
| Compatible Battery Part Numbers | |
| 1240, ABS12-4, BD4-12, CA1240, CT1240, E1240, Exaltor, Exaltor E1250, Exaltor GX-E1240, NP5-12, NX-6, PC1616, PC1832, PC1864, PC580, PC585, PE12v4.5, PS-1240, PX12050, SB1240, SEC1055, SLA4-12, SLA5-12, UB1245, UB1250, UT1240 | |
| Warranty & Returns | |
| ✅ 30-Day Easy Return Policy ✅ 1-Year Replacement Warranty against manufacturing defects |
|
| Latest Update: 30th August 2025 | |
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