Quick answer: Built for cars and vans, the Optima RTU-3.7 carries the rating 44Ah 12V 730A. Terminal position is the detail people most often forget.
12VNominal voltage
44AhAmp-hours at C20
730AStarting power (EN)
Is the Optima RTU-3.7 right for you?
Drivers who search for Optima RTU-3.7 usually have the old battery right in front of them, code and all. Weighing 15.7 kg, it is a manageable lift for one person. People pick batteries online at baterias.online because the measurements and ratings are on show before the basket.
For cars and vans, 44Ah is on the compact side. 730A beats many larger batteries for cranking.
Optima RTU-3.7: dimensions and ratings
ManufacturerOptima
Part numberRTU-3.7
SeriesOPTIMA RED TOP
Applicationcars and vans
Nominal voltage12V
Amp-hours at C2044Ah
Starting power (EN)730A
TechnologySpiral-cell AGM
Dimensions (L × W × H)237 × 172 × 197 mm
Weight15.7 kg
Polaritypositive on the left-hand side
Terminals1 & 21
EAN4016987113561
Using it day to day: practical tips
Drivers who work nights often start their cars in the coldest hours. Keep the old battery's vent plug or elbow if the new one needs it. Leaving the lights on overnight once is forgivable; doing it often harms the battery.
The spiral-cell AGM technology explained
Spiral-cell batteries wind long, thin plates into tight cylinders. Rally cars use spiral batteries for strong current. Avoid deep discharges below the maker's limit.
Make sure it fits your vehicle or equipment
- ✓ Photograph your old terminals and compare with 1 & 21.
- ✓ As a spiral-cell AGM battery it needs matching charge settings in the alternator, charger or solar regulator.
- ✓ Tape measure time: 237 × 172 × 197 mm is the footprint and height of this case. Leave a little clearance for the clamp and the cable lugs.
Frequently asked questions
How do capacity and cranking amps compare with my old battery?
Look at your old label: if it shows 44Ah or less and 730A or less, this battery covers it.
Is the Optima RTU-3.7 suitable for a 12V system?
Yes, if they are identical. Two 12V units of 44Ah in series give double the voltage; in parallel they give double the capacity at 12V.
Where is the plus pole on the Optima RTU-3.7?
On this model it is positive on the left-hand side. Face the battery with the terminals towards you to compare with your current one.
Can I use my usual charger with this battery?
Most smart chargers offer a spiral-cell AGM mode. Select it before charging to protect the battery.
More options
You will find this battery in the cars and vans section of baterias.online, ready to order. Writing the fitting date on the battery helps when planning the next replacement.
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