The Case CX80 compact excavator utilizes a 12-volt direct current electrical system to power engine starting, lighting, instrumentation, and control systems. Meeting the specific cranking power demands of its diesel engine, particularly in challenging environmental conditions, necessitates a robust battery solution. Based on manufacturer specifications and common industry practice for this size and class of machine, the CX80 is typically equipped with two Group 31, 12-volt lead-acid batteries connected in parallel.
(what battery does a case cx80 excavator take)
The parallel configuration is critical. Connecting the positive terminals together and the negative terminals together maintains the system voltage at 12 volts while combining the amperage output (specifically, the Cold Cranking Amps – CCA) of both batteries. This effectively doubles the available starting current compared to a single battery, providing the substantial surge required to crank the diesel engine reliably, even in cold temperatures. Attempting to start the engine with insufficient CCA will result in slow cranking or failure to start, potentially damaging the starter motor or draining the battery excessively.
The key specifications for each Group 31 battery are:
Voltage: 12 Volts DC.
Group Size: 31 (Defining physical dimensions: approximately 13 inches L x 6.8 inches W x 9.4 inches H / 330mm L x 173mm W x 240mm H. This ensures proper fitment within the designated battery compartment(s) on the CX80).
Terminal Type: Standard Top Post terminals (SAE Posts) are the most common configuration for this application, facilitating secure connection to the machine’s cables.
Cold Cranking Amps (CCA): Minimum 800 CCA per battery is strongly recommended, with 900-1000 CCA per battery being ideal for optimal performance, especially in colder climates. CCA represents the number of amps a battery can deliver at 0°F (-18°C) for 30 seconds while maintaining a voltage above 7.2 volts. The CX80’s diesel engine demands high current for starting.
Reserve Capacity (RC): A minimum of 140-160 minutes per battery is desirable. RC indicates how long the battery can supply a minimum essential electrical load (typically 25 amps) if the charging system fails. While primarily for starting, adequate RC provides a buffer for operational loads and supports the machine’s electronic control modules when the engine is off.
Chemistry: Both traditional Flooded Lead-Acid (FLA) and Absorbed Glass Mat (AGM) batteries are suitable options meeting the Group 31 specification. AGM batteries offer significant advantages for construction equipment like the CX80: they are completely sealed, spill-proof, vibration-resistant, require no maintenance (no water topping up), generally have a longer service life, and often provide higher CCA ratings for the same physical size. While AGM batteries typically have a higher initial cost, their durability and reliability make them a preferred choice in demanding environments. FLA batteries remain a cost-effective option but require regular maintenance checks of electrolyte levels and are more susceptible to vibration damage and leakage.
When procuring replacement batteries for the CX80, it is imperative to select two identical Group 31 batteries with matched specifications, particularly CCA and RC. Mixing batteries of different ages, capacities, or technologies can lead to uneven charging, premature failure of one battery, and reduced system performance. Ensure the battery terminals are clean and tight, and the hold-down clamps are secure to prevent movement and vibration damage, a common cause of battery failure in mobile equipment. While Lithium-Ion (Li-ion) batteries offer advantages like weight savings and faster charging, they are currently not a standard or recommended OEM fitment for the CX80 due to significant cost, potential compatibility issues with the standard charging system without modifications, and the need for specific Battery Management Systems (BMS) not typically integrated into the machine’s existing electrical architecture. Lead-acid (FLA or AGM) remains the established and supported technology.
(what battery does a case cx80 excavator take)
In summary, the Case CX80 excavator requires two high-performance 12V Group 31 lead-acid batteries, ideally AGM type, each providing a minimum of 800 CCA (900-1000 CCA preferred) and 140-160 minutes Reserve Capacity, connected in parallel. Adherence to these specifications ensures reliable starting power, supports the machine’s electrical systems, and maximizes battery service life under the rigorous operating conditions typical of compact excavator use. Always consult the specific operator’s manual for your CX80 serial number or contact an authorized Case dealer for the most precise battery recommendation if any doubt exists.