Testers, cables & accessories

Battery testers, quality cables and adapters: the small accessories that make a daily difference with your cells and batteries.

Around cells and batteries revolves a whole set of small accessories that, well chosen, change the everyday experience. A battery tester saves you from throwing away good cells or being caught out at the wrong moment. A quality charging cable, in the right format and correctly sized, guarantees a fast and reliable charge, where a poor cable holds everything back. An adapter or a voltage converter, finally, gets you out of trouble when you need to switch from one connector or voltage to another.
We have gathered here our selection of these essential accessories. For chargers (mains, USB, battery or vehicle), head to our dedicated Chargers section.

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I - Battery testers

You can have the best batteries in the world, they are useless if they are flat. It is not always easy to know a battery's level: that is where the battery tester comes in. This simple device shows you at a glance the charge level of your batteries, so you never throw away a good one again. Here is our selection.

Varta LCD battery tester

13.35€ (2529)

The Varta-branded tester with LCD screen: it checks all common battery formats and clearly shows their state. Handy, readable and from a recognised brand.

  • Formats: AA/AAA/C/D, 9V, buttons
  • Display: LCD screen
  • Power: No battery required
  • Brand: Varta, energy specialist
  • Clear LCD screen, all common formats
The Varta battery tester is an LCD-screen checker from one of the big energy brands. It tests the most common formats (AA, AAA, C, D, 9V, 1.5V cells) as well as button cells, and shows the state of charge on its screen, more readable than a simple needle. It needs no battery to work. Compact and easy to store, it is a handy accessory to check your batteries before binning or replacing them, and avoid nasty surprises with a controller or a remote.
The LCD screen is the real plus over a needle tester: you read the state at a glance, without interpreting a needle's position. It handles common formats and button cells well, and the Varta name is reassuring on longevity. We use it regularly to check controller batteries before a games night, no more interrupted matches. Its rating reflects a very broad user base with varied expectations: a few reports point to a reading that is sometimes a little optimistic on borderline cells. It is not a lab instrument, but for readable, practical home use at a contained price, it does the job very well.
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Ansmann button battery tester

11.57€ (2314)

The specialised tester for button cells: alkaline and lithium (CR2032, LR44...). LEDs show the state of charge at a glance, with no battery required.

  • Formats: Button cells (alkaline/lithium)
  • Display: LEDs
  • Power: No battery required
  • Use: CR2032, CR2025, LR44...
  • Button-cell focus, instant reading
The Ansmann button-cell tester is dedicated to the small cells that a universal tester often handles poorly: alkaline and lithium button cells (CR2032, CR2025, CR2016, LR44 and others). You place the cell on the contact, and LEDs immediately show whether it is full, low or empty. No battery is needed to operate it. Compact and from an energy specialist brand, it is perfect for checking the cells of your remotes, car keys, scales, thermometers, toys and other button-cell devices.
It is the accessory you never think of buying until the day a car key or a scale dies. Universal testers handle button cells poorly, here it is their speciality: you place the CR2032, an LED lights up, and you know instantly. We rediscovered a stock of button cells of unknown state, and sorting took two minutes. The Ansmann brand is a mark of seriousness. Of course, it is a niche product: if you never handle button cells, a universal tester will do. But as soon as you have several CR2032/LR44 devices at home, it renders proud service and avoids buying new cells needlessly.
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BT-168 universal battery tester

7.85€ (1387)

The classic, unbeatable battery tester: a needle, a colour scale, and in a second you know if a battery is good, low or to be binned. No battery required.

  • Formats: AA/AAA/C/D, 9V, buttons
  • Display: Needle, colour scale
  • Power: No battery required
  • Measure: Under load
  • Simple, universal, no battery, very affordable
The BT-168 is the reference universal battery tester: a compact unit with a needle and a colour scale (green = good, yellow = low, red = replace). It tests under load all common formats (AA, AAA, C, D, 9V, 1.5V cells) as well as button cells, thanks to its sliding contacts. It needs no battery to work: the tested cell powers it. Simple, reliable and very affordable, it avoids throwing away good batteries and quickly sorts a full drawer.
Hard to do simpler or more effective for the price. You slide the cell between the contacts, the needle jumps, and the colour tells you everything: green you keep, red to the bin. We used it to clear a drawer full of batteries of unknown age, and in five minutes everything was sorted, several cells thought dead were actually still good. That it needs no battery to work is a real plus, it is always ready. It is obviously not a precision instrument: no numeric value, just a trend, and you have to hold contact well for button cells. But as a home tester, at this price, it is the smart buy par excellence.
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Ansmann Energy Check LCD

55.95€ (88)

Ansmann's premium versatile tester: from button cell to car battery, with a backlit LCD screen and under-load measurement. For those who want the serious option.

  • Formats: AA to D, 9V, buttons + car batteries
  • Display: Backlit LCD
  • Measure: State of charge under load
  • Use: Versatile, semi-pro
  • Versatile LCD tester, from button cell to car battery
The Ansmann Energy Check LCD is a versatile, premium battery tester. It covers a very wide range: round cells AA, AAA, C, D, 9V blocks, button cells, but also vehicle batteries (car, motorcycle) whose state it checks. Its backlit LCD screen clearly shows the charge level, measured under load for a more reliable result than a simple voltage check. Rugged and from a specialist brand, it is aimed at demanding users, photographers, DIYers or enthusiasts who want a single device able to test everything at home and in the garage.
It is the tester you keep for life. Where a few-euro model gives just a trend, the Energy Check LCD gives a clear, reliable reading, under load, for everything: from the AAA cells of remotes to the 12V motorcycle battery at the back of the garage. The backlit screen reads even in dim light, and the Ansmann build inspires lasting confidence. We adopted it to diagnose both a pack of rechargeables and a slightly weak car battery before winter. The only real brake is the price: it is noticeably dearer than a basic tester, and for simple home battery sorting, a BT-168 at 8€ will do. But for those who want a single serious, versatile tool, the investment is justified.
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II - Cables & adapters

It is great to have the best power bank or the fastest charger in the world, but without a good cable between them and your device, everything is held back. The quality and type of cable are essential for fast, reliable charging. We offer here our selection of cables, as well as adapters and converters to switch from one connector or voltage to another.

ESR OTG Connector Adapter

$11.99 $9.95 (75)

This small adapter lets you power a USB-C smartphone using any cable that ends in a micro-USB plug.

  • Type: Micro-USB to USB-C
  • Speed: Up to 480Mbps
  • Function: OTG
  • Extremely handy, reliable
What's more annoying than having a power bank, a cable, and an empty smartphone, but no way to recharge it because it needs a USB-C plug while you only have a cable ending in a micro USB? The simplest solution is to get a micro USB to USB-C adapter like this one from ESR, with its handy elastic band to attach it to your cable so you never lose it. This adapter is also OTG (On the Go) compatible, for data transfer speeds of up to 480Mbps.
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Ugreen USB-C Cable 60W

13.85€ (46379)

A rugged braided-nylon USB-C to USB-C cable: 60W Power Delivery fast charging and data transfer, for smartphones, tablets and laptops.

  • Type: USB-C to USB-C
  • Power: 60W max (Power Delivery, 20V/3A)
  • Jacket: Reinforced braided nylon (1.5 m)
  • 60W fast charging and durability, at a low price
The Ugreen 60W USB-C to USB-C cable is a versatile, durable cord for the USB-C ecosystem. Thanks to Power Delivery fast charging, it delivers up to 60W (20V/3A), enough to quickly charge a smartphone, a tablet, a game controller or even a compatible laptop. Its braided nylon jacket and reinforced connectors resist pulling and repeated coiling. It also handles data transfer. A reliable cable from Ugreen at an accessible price.
You do not expect miracles from a USB-C cable, but you want it to be reliable and to last, and on both counts this one ticks the boxes. The braided nylon jacket changes everything compared with PVC-sheathed cables that crack after a few months: here it resists coiling, being stuffed in a bag and knots without complaint. The 60W fast charging does the job on a smartphone as well as on a low-power USB-C laptop, and data transfer comes in handy. At this price and with Ugreen's reliability, it is hard to go wrong: it is the kind of cable you buy several of so you never run short.
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Anker USB-C Cable 240W

54.21€ (3639)

The cable that no longer throttles charging: the Anker USB-C 240W delivers full power to your laptop and bends without breaking.

  • Power: Up to 240W
  • Type: USB-C to USB-C
  • Length: 1.8 m
  • Sheath: Ultra-durable braided nylon
  • 240W with no throttling, braided and durable
The Anker USB-C to USB-C 240W cable is designed for power-hungry devices: it supports up to 240W of charging, enough to power a powerful laptop, a power station, a smartphone or a tablet at full speed without ever throttling. Its ultra-durable braided nylon sheath withstands thousands of bends and daily wear, where a low-end cable fails quickly. At a practical 1.8 m length, it combines fast charging and data transfer. A reliable, durable USB-C cable from Anker, so you never suffer slow charging again.
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III - Related questions

The simplest way is to use a battery tester: you place the cell in it and the device instantly shows its charge level. Some models also test the most common formats (AA, AAA, C, D, 9V, button cells). This way you avoid throwing away good cells or being caught out by a flat one.

Yes, a lot. An undersized or poor-quality cable limits the current and holds back fast charging, even with an excellent charger. Check the connector type (USB-C, Lightning…), the supported power (in W) and, for fast charging and high throughput, the presence of an e-marker chip on high-power USB-C cables.