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Optima Batteries
As an authorised Optima distributor, Parts for Machines covers the full Optima Spiral Cell AGM battery range — including the products buyers most often ask for: Optima YellowTop (dual-purpose starting + deep-cycle batteries — the highest-converting Optima variant on Parts for Machines, used for vehicles with extra electrical accessories such as winches, audio systems, off-road lights, and auxiliary equipment), Optima RedTop (high-power starting batteries — pure starting power for trucks, SUVs, V8s, diesel engines, hot rods and marine engine-start, NOT designed for deep-cycle use), Optima BlueTop (marine starting and dual-purpose deep-cycle batteries for inland waterway and coastal marine use — distinguished by terminal style: marine starter has dark grey/black case with light grey top, dual-purpose has dark grey case with light grey top and dual-style terminals). Group 34 size dominates UK demand on Parts for Machines, with specific fitments commonly asked for including Land Rover (Defender, Discovery, Range Rover) and Jeep JK (Wrangler 2007-2018) applications. Optima also covers 6V variants for vintage and specialist applications.Battery selection for Optima is application-driven. Match the colour to the use pattern. RedTop: pure engine-starting only — high cold-cranking amps for reliable starting in trucks, SUVs, large-engine V8s, hot rods, and marine engine-start applications. Do not use RedTop for deep-cycle accessory loads (winches, inverters, audio amplifiers running off the battery while the engine is off) — RedTop is not designed to be deeply discharged and will fail prematurely if used cyclically. YellowTop: dual-purpose starting plus deep-cycle — handles engine starting AND running accessory loads (winches, off-road lights, audio amplifiers, inverters, recovery equipment) when the engine is off. The right choice for vehicles fitted with significant aftermarket electrical loads. BlueTop: marine engine-start (vibration-tolerant for marine engine starting) or marine dual-purpose (deep-cycle for marine auxiliary loads — fish-finders, lights, trolling motors). Critical: AGM batteries should not be charged with a standard 'flooded' charger that uses high-voltage equalisation modes; use AGM-compatible chargers only.
Optima is the original Spiral Cell AGM battery brand, owned by Clarios (formerly Johnson Controls Power Solutions).
