Road Regular VUpdated 1 Jul 2026
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Road Regular VUpdated 1 Jul 2026
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Most 'dead' motorcycle batteries aren't dead - they're flat from sitting, and a smart charger brings them back. This covers identifying your battery type (it decides which charger is safe), charging it properly, keeping it healthy over a lay-up, and safely jump-starting when you're caught out. Get the type and the connection order right and this is a five-minute job; get them wrong and you can ruin a battery or worse.
Find the battery (under the seat or a side panel) and read the label: lead-acid / AGM or lithium (LiFePO4). This matters more than anything else here, because the two need different chargers. Note the voltage (almost always 12 V) and where the terminals are.
You can usually charge in place, but if you remove the battery, always disconnect the negative (-) terminal first, then the positive (+) - it avoids a spanner shorting live to the frame. Reverse the order to refit (positive first, negative last).
Clip red to positive (+), black to negative (-), select the correct mode (lead-acid or lithium) and switch on. A smart charger reads the battery and steps the charge automatically, so it's safe to leave. A fully flat battery can take several hours; let it finish rather than pulling it early.
A battery self-discharges just sitting, and a flat lead-acid battery sulphates and dies. Over any lay-up, leave it on a maintainer / tender (a smart charger that tops up and then idles), or charge it fully every few weeks. This is the single biggest thing that decides whether it lasts three years or eight.
From another 12 V vehicle (engine off): connect red to the flat +, red to the donor +, black to the donor -, and the final black to a bare metal ground on your bike away from the battery. Start your bike, then remove the leads in reverse order. Ride or charge afterwards to recover the battery.
All motorcycles
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