Liftmaster 8550 Replacement Battery. Please use a different way to share. AmazonUIPageJS : P).load.js('https://images-na.ssl-images-amazon.com/images/I/01AQtIElnCL.js?AUIClients/InstallmentPaymentDetailPageMetaAsset&5SdabXWB#mobile.215308-T1'); Get in and out when the power's out with Battery Backup. 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Battery Backup. Please try again later. #product-image-gallery .image-gallery-tint{position:absolute;top:0;bottom:0;left:0;right:0;background-color:rgba(0,0,0,.02)}#product-image-gallery{margin-right:-1.4rem;margin-left:-1.4rem}#product-image-gallery .image-gallery-common-desktop-slot,#product-image-gallery .image-gallery-slot{position:relative;text-align:center}#product-image-gallery .product-image{max-height:400px}#product-image-gallery .image-gallery-common-desktop-slot{float:left;margin-left:14px;overflow:hidden;display:inline-block}#product-image-gallery .image-gallery-slot-row-of-two{width:48%}#product-image-gallery .image-gallery-slot-row-of-three{width:30.33333%}#product-image-gallery .product-image-row-of-two{height:400px;object-fit:contain}#product-image-gallery .product-image-row-of-three{height:330px;object-fit:contain} We would like to show you a description here but the site won’t allow us. #prodDetails .prodDetTable{table-layout:fixed;border-spacing:0;padding:0}#prodDetails .prodDetLabel{background-color:#F5F5F5;width:35%;color:#666;vertical-align:top}#prodDetails .prodDetSectionEntry{width:50%!important;white-space:normal;word-wrap:break-word}#prodDetails .prodDet-expander-header{float:right}#prodDetails .prodDet-summaryText-visible{display:none}#prodDetails .prodDet-heading-alignment{float:left}#prodDetails .prodDetAttrValue{word-break:break-word}.uilm-section img{display:block;margin:0 auto;min-width:650px}#medslogo_header_web{padding-bottom:0;color:#C60;font-size:medium;font-family:verdana,arial,helvetica,sans-serif}.burj-body #medslogo_header_web{color:#333;font-weight:400;padding-bottom:0;font-size:21px;font-family:arial,verdana,helvetica,sans-serif}#mllStaticLearnMore{padding-left:14px}#mll-tab-divider{padding-top:30px}#medsLegalLogo_feature_div{margin-bottom:14px!important}#energyEfficiencyLabel{display:inline-block;width:50px;height:23px}.energyEfficiencyArrow{position:relative;width:36px;height:22px;margin-right:22px;color:#FFF;text-align:center;line-height:22px;font-size:15px}.energyEfficiencyArrow:after{content:"";position:absolute;left:100%;top:0;width:0;height:0;border-top:11px solid transparent;border-left-width:10px;border-left-style:solid;border-bottom:11px solid transparent}.energyEfficiencySymbol{position:relative;top:-2px}.energyEfficiencyTextPlacement{position:relative;left:2px}.technicalData .h3color,.technicalData font,.technicalData ul{color:#333!important}.technicalData b,.technicalData strong{font-weight:400!important}#dealprice_shippingmessage i.a-icon.a-icon-popover,#ourprice_shippingmessage i.a-icon.a-icon-popover,#saleprice_shippingmessage i.a-icon.a-icon-popover,.buyboxShippingLabel i.a-icon.a-icon-popover{display:none!important} Home > Garage Door Battery > Liftmaster 8550 Replacement Battery. Chamberlain / LiftMaster / Craftsman 4228 Replacement Battery for Battery Backup Equipped Garag… .glow-widget-top{min-height:40px;background-color:#f8f8f8;margin:-12px -14px 12px;overflow:hidden;z-index:100}.glow-icon{background:url(data:image/png;base64,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) no-repeat;background-size:14px 19px;-webkit-background-size:14px 19px;width:14px;height:19px;margin:10px 10px 10px 14px}.glow-row-1{margin-top:1px}.glow-row-2{margin-top:-4px}.glow-ingress-link-color{color:#333}.glow-city-label{overflow-x:hidden;text-overflow:ellipsis;max-width:68%}.glow-icon-bottom{margin:3px 10px 0 0}#contextualIngressPt{cursor:pointer;display:flex}#contextualIngressPt #contextualIngressPtLabel.cip-a-size-small{font-size:12px!important;line-height:1.5!important}#contextualIngressPt #contextualIngressPtLabel.cip-a-size-mini{font-size:12px!important;line-height:1.5!important}#contextualIngressPtPin{min-width:16px;height:14px;float:left;background-image:url(https://m.media-amazon.com/images/S/sash/kIT-Lj9i1Bch8yi.png);background-repeat:no-repeat;background-size:auto;background-position:center;margin-right:5px;margin-top:2px}@media only screen and (-webkit-min-device-pixel-ratio:2),only screen and (min-resolution:192dpi),only screen and (min-resolution:2dppx){#contextualIngressPtPin{background-image:url(https://m.media-amazon.com/images/S/sash/nJCzu3ZNAgUz-2w.png);background-size:contain}#contextualIngressPtPinMobile{background-image:url(https://m.media-amazon.com/images/S/sash/crHb1a4bs3b6SUF.png);background-size:contain}}#contextualIngressPtMobileApp{display:table}#contextualIngressPtPinMobile{min-width:16px;height:20px;float:left;background-image:url(https://m.media-amazon.com/images/S/sash/rmbns9hA-ND5Ju7.png);background-repeat:no-repeat;background-size:auto;background-position:center;margin-bottom:1px;margin-right:6px}#contextualIngressPtMobileApp #contextualIngressPtPinMobile{width:16px;height:20px;float:left;background-image:url(https://m.media-amazon.com/images/S/sash/rmbns9hA-ND5Ju7.png);background-repeat:no-repeat;background-size:auto;background-position:center;margin-bottom:1px;margin-right:6px;display:table-cell}#contextualIngressPtMobileApp #contextualIngressPtLabel{display:table-cell;vertical-align:middle}