--- product_id: 50637980 title: "Sealey Bt102 Digital Battery And Alternator Tester 12V" brand: "sealey" price: "€ 0.18" currency: EUR in_stock: false reviews_count: 9 url: https://www.desertcart.hr/products/50637980-sealey-bt102-digital-battery-and-alternator-tester-12v store_origin: HR region: Croatia --- # Low current draw tech for safe diagnostics LED display for instant condition readout 12V battery & alternator testing Sealey Bt102 Digital Battery And Alternator Tester 12V **Brand:** sealey **Price:** € 0.18 **Availability:** ❌ Out of Stock ## Summary > 🔧 Don’t guess—know your battery’s health in seconds! ## Quick Answers - **What is this?** Sealey Bt102 Digital Battery And Alternator Tester 12V by sealey - **How much does it cost?** € 0.18 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/50637980-sealey-bt102-digital-battery-and-alternator-tester-12v) ## Best For - sealey enthusiasts ## Why This Product - Trusted sealey brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Instant LED Feedback:** Clear, easy-to-read LED control panel delivers fast, accurate battery and charging system status. - • **Smart Low-Current Technology:** Protects battery health by using minimal current during testing—no risk of draining your power source. - • **Versatile Battery Compatibility:** Effortlessly tests SLI, VRLA, AGM, and Gel batteries with just a simple input of battery rating. - • **Pro-grade Precision in Your Palm:** Compact, professional digital tester designed for quick, reliable battery and alternator diagnostics. - • **Beyond Batteries—Alternator Insight:** Unique ability to evaluate your vehicle’s alternator and charging circuitry, saving you costly surprises. ## Overview The Sealey BT102 is a compact, professional-grade 12V digital tester that quickly and accurately evaluates the condition of various battery types (SLI, VRLA, AGM, Gel) and vehicle charging systems. Featuring low current draw technology, it ensures safe diagnostics without draining the battery. Results are displayed instantly on a clear LED panel, and it uniquely tests alternator and charging circuitry, making it an essential tool for proactive vehicle maintenance. ## Description Product Description Compact design digital tester suitable for professional use. Utilises low current draw technology to evaluate condition of SLI, VRLA, AGM and Gel batteries and charging systems. Just key in the battery rating from the top of the battery. Simple, fast and accurate evaluation of battery condition. Results displayed on LED control panel. No internal battery and will test batteries with a residual charge of just 7V. Can also be used to evaluate the condition of the alternator and charging circuitry of the vehicle. Box Contains 1 x Digital Battery & Alternator Tester 12V Review: A Useful and Versatile Piece of Kit - Very keen price and extremely quick delivery from ONE SAFE SOURCE (despite the slightly odd name of this supplier!) The tester appears to work well - does what it says on the tin. Except that there is no tin - the tester would benefit from coming in some kind of storage case, box or at least a bag, to stop the leads dangling untidily when not in use. And it would benefit from having slightly longer leads. As Keith B says in his very helpful 2014 review, this tester - as distinct from the otherwise very similar BT101 - will also test a car's starting system and charging system. Sealey's newer BT103 battery tester (reviewed in the July 2016 issue of Car Mechanics) seems to be neat and slick to use and has an LCD display (easier to see in bright sunlight than the red LED display of the BT101 and 102) but only tests the battery, not the starting & charging systems. Which is why I bought the older but more versatile BT102. Some other reviewers have severely criticised the poor visibility of the red LED display on the BT102, but once you realise that you need to shade it from bright sunlight in order to be able to read it, that is a trivial issue with what is a neat, small, reasonably priced, useful, versatile and fairly straightforward-to-use piece of equipment. If it saves you buying a new battery when you don't need to (a battery may be perfectly sound but just need charging) or if it saves you wasting time struggling with a battery which may look OK and be fully charged but which is actually clapped out and unable to hold its charge or to deliver a decent starting current, then this little tester will have earned its keep. Especially if you share it with your mates or a neighbours. Recommended. Review: good cca checker - does what it says on the tin, checks voltages, gives a cold start voltage and I bought it to check cca, seems to be correct. In the end I decided alternator charge voltage was on the low limit, so pointed me in the right direction as the battery seemed good ## Features - Features:Compact design digital tester suitable for professional use - Utilises low current draw technology to evaluate condition of SLI, VRLA, AGM and Gel batteries and charging systems (BT102 only) - Just key in the battery rating from the top of the battery - Simple, fast and accurate evaluation of battery condition - Results displayed on LED control panel ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B001K4AUNW | | Brand | Sealey | | Colour | Red | | Customer Reviews | 4.4 4.4 out of 5 stars (17) | | Included Components | 1 x Digital Battery & Alternator Tester 12V | | Item Dimensions | 17 x 82 x 17 millimetres | | Item Type Name | Tool | | Item Weight | 0.28 Kilograms | | Manufacturer | Sealey | | Measurement Type | Battery Tester | | Minimum Operating Voltage | 12 Volts | | Model Number | BT102 | | Power Source | Battery Powered | | Style Name | Professional | ## Product Details - **Brand:** Sealey - **Colour:** Red - **Item weight:** 0.28 Kilograms - **Power source:** Battery Powered - **Style:** Professional ## Images ![Sealey Bt102 Digital Battery And Alternator Tester 12V - Image 1](https://m.media-amazon.com/images/I/61LSmiESomL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ A Useful and Versatile Piece of Kit *by T***S on 31 August 2016* Very keen price and extremely quick delivery from ONE SAFE SOURCE (despite the slightly odd name of this supplier!) The tester appears to work well - does what it says on the tin. Except that there is no tin - the tester would benefit from coming in some kind of storage case, box or at least a bag, to stop the leads dangling untidily when not in use. And it would benefit from having slightly longer leads. As Keith B says in his very helpful 2014 review, this tester - as distinct from the otherwise very similar BT101 - will also test a car's starting system and charging system. Sealey's newer BT103 battery tester (reviewed in the July 2016 issue of Car Mechanics) seems to be neat and slick to use and has an LCD display (easier to see in bright sunlight than the red LED display of the BT101 and 102) but only tests the battery, not the starting & charging systems. Which is why I bought the older but more versatile BT102. Some other reviewers have severely criticised the poor visibility of the red LED display on the BT102, but once you realise that you need to shade it from bright sunlight in order to be able to read it, that is a trivial issue with what is a neat, small, reasonably priced, useful, versatile and fairly straightforward-to-use piece of equipment. If it saves you buying a new battery when you don't need to (a battery may be perfectly sound but just need charging) or if it saves you wasting time struggling with a battery which may look OK and be fully charged but which is actually clapped out and unable to hold its charge or to deliver a decent starting current, then this little tester will have earned its keep. Especially if you share it with your mates or a neighbours. Recommended. ### ⭐⭐⭐⭐ good cca checker *by X***9 on 31 May 2016* does what it says on the tin, checks voltages, gives a cold start voltage and I bought it to check cca, seems to be correct. In the end I decided alternator charge voltage was on the low limit, so pointed me in the right direction as the battery seemed good ### ⭐⭐⭐⭐⭐ Good bit of kit to have in the garrage! *by D***D on 12 June 2016* Well I had VW come out and they said the battery was good, but using this to see that the battery had lost over 100Ah cold cranking it was clear the battery was cream crackered, new battery installed and I've never looked back since! Worth the money. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/50637980-sealey-bt102-digital-battery-and-alternator-tester-12v](https://www.desertcart.hr/products/50637980-sealey-bt102-digital-battery-and-alternator-tester-12v) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-04-23*