Optima RTC-4.2 · 50Ah 12V 815A · petrol and diesel passenger vehicles

In short: Put simply: Optima RTC-4.2, rated 50Ah 12V 815A, sold for cars and vans. The code RTC-4.2 on your old label is the quickest confirmation.

Is the Optima RTC-4.2 right for you?

For cars and vans that call for a Optima RTC-4.2, here are the facts, rated 50Ah 12V 815A. The figures for the Optima RTC-4.2 are copied from the maker's data, so you can compare like with like. With the old battery's label in your hand, finding its match at baterias.online is straightforward.

50Ah is a typical capacity for cars and vans. 815A gives extra confidence on cold mornings.

Will the Optima RTC-4.2 fit?

• ✓ Make room for 254 × 175 × 200 mm, including clearance above the posts.
• ✓ Stored energy reserve: 50Ah. Going much lower than your current battery can leave you short on cold mornings or long stops.
• ✓ Cold cranking current reaches 815A. It ought to equal the carmaker's requirement at minimum, more so for diesels in cold winters.

Optima RTC-4.2: dimensions and ratings

Answers before you buy

How spiral-cell AGM batteries work and how to look after them

Rolled plates give a large surface area in a compact cell. Low internal resistance lets spiral batteries recharge quickly. Avoid discharging below the level the maker recommends.

More options

Ordering the Optima RTC-4.2 online at baterias.online is simple once the code checks out. Once the battery is in, keep the old one for recycling at an authorised point.

• More for cars and vans
• The complete Optima range

Optima RTC-4.2 in everyday use

Heavy rain and wipers, lights and demisters all running ask a lot of a small battery. Take the negative lead off first and put it back last when swapping the battery. A swollen or cracked case means the battery should come out straight away.