In Málaga, batteries don't die in winter like in central Europe — they die at the end of summer. Every September and October we get an avalanche of cars that "won't start on the first cold morning", but the real cause is the sustained heat of the previous months.

The cold myth: why it doesn't apply in Málaga

Cold reduces battery output (at -10 °C it delivers only 65%), but cold doesn't degrade the battery; it only makes failures visible. What truly damages plates and electrolyte is sustained heat. In Málaga that's 4-5 months a year.

What heat does to your battery

  1. Electrolyte evaporation: in open batteries with caps, water evaporates above 35 °C. Engine bay in August can reach 70 °C.
  2. Accelerated self-discharge: 5%/month at 20 °C, 15-20%/month at 35 °C, up to 30%/month at 50 °C.
  3. Irreversible sulphation: battery below 50% charge for more than 1-2 weeks forms lead sulphate crystals that reduce capacity permanently.

Why it fails in October, not August

In summer, the warm engine needs less current to start, so a degraded battery still works. When the first cool morning of autumn hits Málaga (5-10 °C), the engine demands full nominal current. The sulphated battery can't deliver — and you discover the damage from July.

How to protect your battery in summer

  1. 2+ week holidays: shade parking; disconnect negative terminal; better yet, intelligent maintainer (CTEK, Varta, Optimate).
  2. Short urban trips: once a week do a 30-40 min highway run to fully recharge.
  3. Clean terminals: tighten and apply dielectric spray.
  4. Free check in Sept/Oct — best moment to catch a damaged battery before failure.

FAQ

AGM or conventional in Málaga summer?

AGM. Sealed, no evaporation. 6-8 years vs 4-5 for conventional.

Big parasitic drain + long holiday?

Disconnect negative or use an intelligent maintainer.

Free check Sept/Oct. +34 952 31 01 18.