Guides
The purchase becomes urgent after the builder obtains a batch of cells, notices inconsistent voltage sag in a prototype pack, or reaches the cell-matching stage of a planned build and discovers that their charger reports unstable or unexplained resistance values.
Buying guide
A mixed batch of rechargeable cells is waiting on a UK workshop bench, and their open-circuit voltages look frustratingly similar. A repeatable resistance-and-voltage check can help separate obvious outliers before capacity or load testing begins.
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Use cases
A mixed batch of new, reclaimed or previously used 18650 cells is waiting on a UK workshop bench. Similar voltage readings are not enough, so the builder needs a consistent way to compare internal resistance and separate outliers before further testing.
Read guide →Before you buy
A mixed batch of rechargeable cylindrical cells is waiting on a UK workshop bench, and similar open-circuit voltages are making weak cells difficult to spot. The aim is to compare resistance and voltage consistently, record outliers and decide which cells need further testing before a pack is assembled.
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