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Chamberlain and LiftMaster share a parent company. They do not share a parts bin. Chamberlain Group’s press release of January 21, 2026 calls LiftMaster its leading brand of professionally installed access products, and lists LiftMaster and Chamberlain as the two flagship brands. Model numbers, learn buttons, and which generation of remote they accept are the differences that show up in a Long Island garage. The LiftMaster page stays on that brand. Drive types without a model number stay on the opener page.
The model the old Chamberlain links now land on
On November 3, 2026, Chamberlain’s product URLs for B4643ST and B6753ST both redirected to one current page, model B6850. If a quote or a blog still names B4643 or B6753, ask whether the unit in the box is a B6850. Specs below are from that B6850 page.
| B6850, as Chamberlain lists it | |
|---|---|
| Drive | Belt, DC motor, soft start and stop |
| Lift figure | Listed as 1 1/4 HPs. The footnote says this is for comparison with an AC motor, and that DC lift is usually not measured in horsepower |
| Battery backup | Yes |
| Light | Dual LED, 2,000 lumens |
| Camera | 360 degree, wide angle, night vision, viewed in the myQ app |
| Learn button | White |
| Remotes | Security Plus 3.0. The page says it is not compatible with Security Plus 2.0 accessories. HomeLink 4 and newer is listed as compatible |
| In the box | 3 button remote, motion detecting wall control, wireless keypad, backup battery |
| Warranty on this model card | Motor 10 years, belt 10 years, parts 5 years, accessories 1 year |
Chamberlain does not print an installed price on that page. No Long Island company page checked for this article prints a Chamberlain model price either. Expo Garage Doors in Roslyn says it services Chamberlain, LiftMaster, and Genie, and that it installs quiet belt drive and Wi-Fi openers. That is not a dollar quote. Treat a phone number for “a Chamberlain” as incomplete until it names B6850 or another model.
Why last year’s remote goes in the drawer
The B6850 page says the opener wants Security Plus 3.0 accessories and will not take Security Plus 2.0. LiftMaster’s 84501 page lists Security Plus 2.0 and a yellow learn button. The B6850 learn button is white. If you are replacing one of those LiftMaster units, or any opener bought with Security Plus 2.0 remotes, budget new remotes and a new keypad. The included 3 button remote and wireless keypad on the B6850 are the ones that match.
Flash codes, when the new or old motor will not close, are shared support articles. Chamberlain writes them for both brands. They are on the opener repair page, which is the right page if the motor you have is acting up and you are not shopping yet.
Battery life, and which state wrote the rule
The B6850 includes battery backup. Chamberlain’s battery backup page says a battery lasts about 1 to 2 years with normal use, that you should unplug the battery if the opener will sit unplugged for a long stretch, and that a generic 12 volt battery is not what it recommends. It wants the OEM Chamberlain battery. The opener beeps and a battery LED turns red when it is time.
The same page says battery backup openers comply with California SB-969, and it describes that as a California requirement when a homeowner there installs a new door or replaces an opener. It does not mention Nassau County or Suffolk County. Do not pay a “code upgrade” on Long Island on the strength of that California line. Ask the installer what New York item they are citing, or skip the fee.
Chamberlain also says battery backup is only on DC operators, because a battery supplies DC power. The B6850 is DC. That is why this feature shows up here and not on an older AC chain unit.
Warranty clock, different from the LiftMaster card
Chamberlain’s limited warranty is issued by The Chamberlain Group LLC, the same seller named on LiftMaster’s warranty. Two details are worth separating from the LiftMaster model card:
- Timing. Chamberlain starts the warranty on the purchase date or the delivery date, whichever is later. Keep whichever paper is later.
- Length on the B6850 card. Ten years on the motor and the belt, five on parts. The LiftMaster 84501 card lists a lifetime motor and belt and one year on parts. Those are different promises on different models. Do not let a salesperson blend them into “lifetime, same company.”
Both warranties leave removal and reinstall labor, and the door’s springs, rollers, and hinges, to you. The local company’s labor warranty is a third document. Island Door Pros publishes a 90 day labor warranty on its own work, and it advertises LiftMaster rather than this retail model. If a company installs a B6850, ask whether that 90 day line, or some other labor term, applies to a Chamberlain they did not sell as a dealer model.
What to write on the estimate
- model B6850, or the other model number if it is not that unit
- confirmation the remotes in the price are Security Plus 3.0
- whether your car’s HomeLink is version 4 or newer
- battery included, and who replaces it when the LED goes red in a year or two
- labor warranty from the installer, separate from the 10 year motor line
- the installer’s Nassau or Suffolk license number, checked with the license guide