--- product_id: 10943536 title: "BT558 Self-powered Battery Tester" brand: "sinometer" price: "£0.17" currency: GBP in_stock: false reviews_count: 8 url: https://www.desertcart.co.uk/products/10943536-bt558-self-powered-battery-tester store_origin: GB region: United Kingdom --- # Self-powered, no internal battery needed Compact 2x2x1 inch lightweight design Tests AA, AAA, C, D, 9V batteries BT558 Self-powered Battery Tester **Brand:** sinometer **Price:** £0.17 **Availability:** ❌ Out of Stock ## Summary > 🔋 Never get caught powerless—test smarter, live charged! ## Quick Answers - **What is this?** BT558 Self-powered Battery Tester by sinometer - **How much does it cost?** £0.17 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/10943536-bt558-self-powered-battery-tester) ## Best For - sinometer enthusiasts ## Why This Product - Trusted sinometer brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Risk-Free Confidence:** Backed by a 90-day money-back guarantee and 1-year limited warranty for peace of mind. - • **Zero Maintenance Power:** Self-powered design means no internal battery to replace—always ready when you are. - • **Precision You Can Trust:** Accurate battery health readings to keep your devices powered and productive. - • **Pocket-Sized Portability:** Ultra-compact and lightweight for on-the-go battery testing anytime, anywhere. - • **Universal Battery Compatibility:** Effortlessly checks all common battery types—AA, AAA, C, D, and 9V. ## Overview The BT558 Self-powered Battery Tester by Sinometer is a compact, lightweight device designed to test AA, AAA, C, D, and 9V batteries without needing an internal power source. Its durable, self-powered design ensures reliable battery health checks anytime, backed by a 90-day money-back guarantee and a 1-year limited warranty. ## Description ## Features - Checks AA, AAA, C, D, 9V types of regular or rechargeable batteries - Internal battery not required, lasts forever. - Compact size and light weight - 90 days money back guarantee and 1 year limited warranty ## Technical Specifications | Specification | Value | |---------------|-------| | Manufacturer | Sinometer | | Part Number | BT558 | | Item Weight | 1.44 ounces | | Product Dimensions | 2 x 2 x 1 inches | | Item model number | BT558 | | Is Discontinued By Manufacturer | No | | Power Source | Battery Powered | | Voltage | 9 Volts | | Item Package Quantity | 1 | | Batteries Included? | No | | Batteries Required? | No | ## Product Details - **Brand:** Sinometer - **Power Source:** Battery Powered - **Item dimensions L x W x H:** 2 x 2 x 1 inches - **Measurement Type:** Voltmeter - **Manufacturer:** Sinometer ## Images ![BT558 Self-powered Battery Tester - Image 1](https://m.media-amazon.com/images/I/61PTvt568IL.jpg) ![BT558 Self-powered Battery Tester - Image 2](https://m.media-amazon.com/images/I/81A9TFdBdtL.jpg) ![BT558 Self-powered Battery Tester - Image 3](https://m.media-amazon.com/images/I/61KpR-xPtWL.jpg) ![BT558 Self-powered Battery Tester - Image 4](https://m.media-amazon.com/images/I/71b265wGlBL.jpg) ![BT558 Self-powered Battery Tester - Image 5](https://m.media-amazon.com/images/I/61lZbClt0dL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars Sinometer BT558 Self-powered Battery Tester *by E***R on Reviewed in the United States on August 1, 2013* Firstly you should this is the third purchase of the same exact item. The item is just that good of a product, The first purchase of one item was nearly a year ago. It works so well that I bought two more. The battery tester will test 9 volt, AAA, AA, C , D batteries, if the needle goes into the green it is good, yellow it is weak, and red it is totally out of power. Bought two more as a gift for a friend and another for a gift to my brother. It will save you money, when you place two or more batteries into an electronic device it often will drain power from one ore two batteries more than than the others. So when the device does not function correctly anymore than pull the batteries out and test each one, one at a time, Then get rid of any that have no power left in them, If there is four C batteries needed three or two will still power in them enough to run the device correctly so all you have to do is just replace the dead ones. It will save you money from having to replace all batteries to get the device back working. This is saving me money every month, due to not throwing out good batteries at all, now that I have and use this battery tester. Easy to use and the reading is very easy to read. Really you can not go wrong with owning this money saving battery tester. ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars hard to find *by J***N on Reviewed in the United States on February 13, 2024* had misplaced my little, inexpensive battery tester. seems that it is hard to find a battery tester that doesnt run on batteries. this one is self powered like my old one- which i later found- and inexpensive. i have had my other self powered tester for over 20yrs and it still workd perfectly and am sure this will do the same ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars Great Gadget *by C***A on Reviewed in the United States on May 19, 2009* This is a simple, almost foolproof device. You open the arm to touch the contacts to the battery and look at the meter. Green is good, red is bad. There are two contacts on the side for 9V batteries. The arm is configured so coin batteries can be tested too. It takes just a few seconds to test almost any kind of battery.This device worked great. Although it's not a true "load test" it will certainly sort the live from the dead. I was able to go through dozens of batteries in just a few minutes.I recycle dead batteries which means they accumulate until I get around to dropping them off. Nobody grabs the loose batteries out of the drawer because they don't know which ones are alive or dead. I accumulated a few dozen batteries and really needed a way to sort them out. All done!It's hard to complain about a $6 device, but since you've read this far I figure you might be interested. I had to wiggle the 9V batteries to make contact. It still works, but you have to be careful lest you discard some good 9Vs.Given the cost of batteries, this is a great investment. --- ## 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.co.uk/products/10943536-bt558-self-powered-battery-tester](https://www.desertcart.co.uk/products/10943536-bt558-self-powered-battery-tester) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-27*