Battery Codebook, a reference desk for the tiny batteries in your drawer

Field notes

The reference resolves a printed marking into a canonical battery family, then separates physical fit from electrical equivalence. Its example maps LR44 to A76, AG13, L1154, and V13GA and reports 11.6 × 5.4 mm dimensions, 1.5 V nominal voltage, alkaline chemistry, drain context, confidence, and a source route. The site also supports measurement lookup and side-by-side comparison, while explicitly excluding unsupported rechargeable and specialist codes rather than inferring matches.