Written by DINWEY Technical Team · Published 2026-08-30

Batteries for Cold-Chain & Refrigerated Transport¶

Q: What battery does a refrigerated truck need?

A refrigerated truck needs a starting battery with adequate CCA for the engine, plus a separate deep cycle or auxiliary battery bank for the refrigeration unit — the two loads should not share a single starting battery.

Q: Why do reefer trucks need separate batteries?

The refrigeration unit draws continuous power and can deep-discharge a starting battery, which is not designed for that. A separate auxiliary bank protects the starting battery and keeps the refrigeration running.

Q: Do cold-chain trucks need more CCA?

The starting battery still needs CCA matched to the engine and climate. The refrigeration load is handled by the auxiliary bank, not by raising the starting battery's CCA.

Q: How is a reefer truck's electrical system configured?

Typically the starting battery is dedicated to engine cranking, while a separate deep cycle or auxiliary bank powers the refrigeration unit, isolated via a battery isolator or DC-DC charger.

Q: How long should a reefer battery last?

With a properly sized and isolated auxiliary bank and regular charging, a reefer truck starting battery typically lasts 3–5 years, similar to other heavy-duty truck batteries.

TL;DR — Refrigerated trucks need two things: a starting battery with adequate CCA for the engine, and a separate deep cycle or auxiliary bank for the refrigeration unit. Never run a reefer off the starting battery — the continuous draw will deep-discharge and ruin it.

Two Separate Loads¶

Cold-chain transport has two distinct electrical loads:

Load	Requirement	Battery type
Engine starting	High CCA burst	Starting (SLI) battery
Refrigeration unit	Continuous power	Deep cycle / auxiliary bank

Why Separation Matters¶

The refrigeration unit draws power continuously — often with the engine off or at idle. A starting battery is built for short, high-current bursts, not sustained deep discharge. Running a reefer off the starting battery will:

Deep-discharge it, damaging the plates
Shorten its service life dramatically
Risk a no-start when the truck needs to move

Recommended Configuration¶

Starting battery — dedicated to engine cranking, matched CCA to the engine and climate
Auxiliary bank — deep cycle batteries for the refrigeration unit
Isolation — a battery isolator or DC-DC charger prevents the reefer from draining the starting battery

Battery Selection Tips¶

Match the starting battery's group size and CCA to the vehicle (JIS N150/N200, DIN88/DIN100)
Size the auxiliary bank to the reefer unit's continuous draw and required runtime
Consider AGM for the auxiliary bank — it tolerates cycling better than flooded

References¶

Find the Right Battery¶

Need a specific model or datasheet? Browse the DINWEY product range (fleet battery solutions) or contact us for a quote.

Specifications sourced from Chengguang Energy technical documentation under an IATF 16949 quality management system. CCA/Ah/RC values are per-model and verified against manufacturer data sheets — always confirm against your vehicle manual. Questions? Contact DINWEY.

DINWEY OEM Factory — Truck & Heavy-Duty Starting Batteries This guide is published by DINWEY, the truck-battery brand of Chengguang Energy (founded 2002). Browse the full product range, request a datasheet, or discuss OEM / private-label programs.