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Why Do Motorcycle Batteries Go Flat? A Winter Guide

30 September 2026 · 1 min read

Why do batteries die on bikes that stand unused, and how do you protect them? A pre-winter checklist.

The most common problem on motorcycles left standing over winter is a flat battery. Alarms, clocks and the ECU draw a small current even with the engine off.

To protect your battery

  • If the bike will stand for more than two weeks, disconnect the battery or use a smart battery maintainer.
  • Riding for 15–20 minutes once a week does more good than just idling the engine.
  • Clean any corrosion off the terminals.

Pre-winter checklist

  • Change the engine oil (acids in old oil corrode the engine from inside)
  • Fill the tank – an empty tank rusts inside
  • Check tyre pressures
  • Lubricate the chain and store the bike dry and covered

A battery test takes just a few minutes at our workshop, and we check your charging system free of charge.

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