12VVolts
120AhCapacity, 20-hour rate (C20)
29.9 kgWeight
In short: Drivers and owners of boats and motorhomes know this one as the Q-Battery 12SEM-120. Measure twice, order once: dimensions decide most swaps.
Specifications table
MakeQ-Battery
Part number12SEM-120
RangeSEMITRACTION BATTERY
Suitsboats and motorhomes
Volts12V
Capacity, 20-hour rate (C20)120Ah
Battery technologyLead-acid
Dimensions (L × W × H)347 × 175 × 234 mm
Weight29.9 kg
Terminal polaritypositive on the right-hand side
Terminal typeA-Pole
Getting the best from the Q-Battery 12SEM-120
A caravan with a motor mover asks for big bursts of current. Strap the battery down as firmly as you would the engine. Leaving the charger on the wrong chemistry setting can quietly overcharge or undercharge a whole season.
Q-Battery 12SEM-120 for boats and motorhomes
Boat, caravan or campervan with a Q-Battery 12SEM-120 on board? This page covers it. Leisure batteries are judged on capacity and recovery more than on cranking. Every leisure battery at baterias.online lists its chemistry and size.
120Ah is right in the usual range for boats and motorhomes.
Answers before you buy
Which way round are the posts on this battery?
On this model it is positive on the right-hand side. Face the battery with the terminals towards you to compare with your current one.
Is lead-acid the same as the battery I have now?
It is built with lead-acid technology. Pick charging equipment with a matching mode and avoid storing it discharged.
What connector type is fitted to this battery?
Terminal type: A-Pole. Compare with the posts or tabs on your current battery.
Is the Q-Battery 12SEM-120 part of a wider range?
It belongs to SEMITRACTION BATTERY. If you need a different size with the same construction, look within that range.
Quick compatibility checklist
- ✓ Capacity 120Ah: equal to or a little above your old label is ideal.
- ✓ Photograph your old terminals and compare with A-Pole.
- ✓ Built with lead-acid technology: if your vehicle or system was set up for another chemistry, check the charging settings first.
See also
Everything on baterias.online is filed by brand and reference, so ordering the Q-Battery 12SEM-120 is straightforward. Not quite the right size? Have a look at other batteries for boats and motorhomes.
Care tips for lead-acid batteries
During discharge, the plates and acid form lead sulphate and water. Flooded batteries offer strong starting current at a fair price. Keep a flooded battery upright and the vent path clear.
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