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B&Q£8.99Visit shop B&Q - Universal Battery Tester Analogue Display Aa Aaa C D 9V Pp3 Coin Cell Tester
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The Mercury Universal Battery Tester is an essential tool for homeowners, hobbyists, and office managers who want to eliminate waste and ensure their devices always have fresh power. By providing a clear, instant reading of your battery's charge level, it saves you from discarding functional cells prematurely, though it relies on an analogue needle display which requires careful observation compared to digital alternatives.
| Brand | Mercury |
|---|
No, it is powered entirely by the battery you are testing.
Yes, it can test the voltage levels of rechargeable batteries, though it will only show their current charge, not their total capacity.
It is recommended to wipe away any residue first; if the battery is severely corroded, it should be disposed of properly rather than tested.
Use the dedicated slot or the spring-loaded arm designed to hold flat circular batteries against the contact point.
This is rare, but usually indicates the battery is at its peak voltage or the tester is being pressed too hard against the contacts.
Ensure the battery is making solid contact with the metal points and that the polarity is correct (positive to positive, negative to negative).
Press the battery more firmly against the contacts to ensure a stable electrical connection.
While normal due to the energy drawn, stop testing for a moment to allow the device to settle.
There is no setup required for this device; it is ready to use the moment it arrives. Because it powers itself directly from the battery under test, there are no internal components or batteries to replace, which significantly increases the lifespan of the tool.
To maintain the tester:
