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If your Mitsubishi Eclipse struggles to start or shows dim lights, choosing the right car battery matters for day-to-day reliability and longevity. The right replacement ensures proper fit, sufficient cold-cranking power for your climate, and enough reserve capacity to handle accessories and short trips. This guide covers six shortlisted Mitsubishi Eclipse car battery options selected for fit and performance. We evaluated each option on fitment, cold-cranking amps, reserve capacity, and expected service life to help you pick the best match for your driving patterns and climate.
Looking for other parts? See all Mitsubishi Eclipse parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | UPLUS AGM Group 140R Car Battery (12V, 50Ah, 570 CCA) |  |
| Best Quality Built to a higher standard if you want something more solid | MARXON Group 140R H4 LN1 12V 50Ah AGM Start-Stop Car Battery |  |
| Best Budget The cheapest option that still gets the job done reliably | Relistart 12V 60Ah Group 47 AGM Start-Stop Car Battery (680 CCA) |  |
| Most Sold A high-volume bestseller chosen again and again | Mighty Max Battery MM-H5 Group 47 12V 60Ah AGM Car Battery |  |
| Best Value for Money The sweet spot between price and what you get | 1AUTODEPOT Group 47 (H5) 12V AGM Car Battery, 60Ah, 680 CCA |  |
| Best Overall The best all-around choice for most situations | OPTIMA Batteries RedTop 35 Sealed AGM Starting Battery |  |
1. UPLUS AGM Group 140R Car Battery (12V, 50Ah, 570 CCA)
| BCI Group Size | 140R (H4, LN1) |
|---|---|
| Voltage | 12 Volts |
| Nominal Capacity (20HR) | 50 Ah |
| Cold Cranking Amps | 570 CCA |
| Reserve Capacity | 80 min |
This UPLUS Group 140R AGM battery is a sealed, maintenance-free 12V unit intended as a direct replacement for vehicles that accept BCI Group 140R (H4/LN1) batteries. It combines AGM construction with a calcium-lead positive grid to deliver reliable starting power and improved cycle durability for cars that see frequent short trips or heavy accessory use. Notable features include a 570 CCA rating for dependable cold starts, an 80-minute reserve capacity for brief electrical loads, and claimed enhanced vibration resistance and longer cycle life versus conventional flooded batteries. In practice the battery suits owners who need a robust factory-replacement style battery with start-stop capability and better deep-cycle tolerance. Limitations are its specific group size and terminal layout, which require that the Mitsubishi Eclipse being serviced uses the Group 140R footprint and left negative/right positive terminals, and its 50 Ah nominal capacity may be smaller than some larger replacements for heavily modified electrical systems.
Best for: A reliability-focused buyer who prioritizes a factory-quality, maintenance-free replacement that withstands frequent short trips and heavier electrical loads on a Mitsubishi Eclipse.
Less Ideal for: Drivers planning major audio or accessory upgrades or who need a higher-capacity battery should consider larger group-size alternatives or dedicated deep-cycle units.
- AGM construction for sealed, maintenance-free operation and better vibration resistance
- 570 CCA provides reliable cold-start performance
- Designed for start-stop and high-electrical-load vehicles, so it tolerates frequent cycling better than standard flooded batteries
- 80 minute reserve capacity to support accessories when the engine is off
- 3-year after-sales support from the brand for added reliability assurance
- Only fits vehicles that accept BCI Group 140R with the specified terminal layout
- 50 Ah nominal capacity may be lower than some higher-capacity replacement options
Verdict A dependable, maintenance-free AGM replacement for Mitsubishi Eclipse owners seeking factory-style reliability and solid cold-start performance in the Group 140R footprint.
2. MARXON Group 140R H4 LN1 12V 50Ah AGM Start-Stop Car Battery
| Voltage | 12V |
|---|---|
| Capacity | 50Ah |
| Battery type | AGM |
| Group size | BCI 140R H4 LN1 |
This MARXON Group 140R is a maintenance-free 12V AGM battery intended as a direct replacement for vehicles that accept the BCI 140R H4 LN1 size and require start-stop capability. In everyday use it supplies reliable cranking power and supports vehicles with start-stop systems while accepting charge faster than conventional SLA batteries, which helps recovery after engine-off stop events. The AGM construction reduces the risk of leakage and allows a deeper discharge tolerance compared with basic flooded batteries. Practical benefits include quicker recharge acceptance, a sealed, maintenance-free design, and corrosion-resistant alloy components aimed at longer-term durability. Limitations to keep in mind are that fitment depends strictly on the Eclipse's required group size and terminal orientation, and while many drivers report strong short-term performance, long-term longevity in cold climates or under heavy accessory loads is not proven by the product details alone. Buyers should verify physical fit and terminal type for their Mitsubishi Eclipse before installation.
Best for: Performance-oriented buyers who prioritize reliable start-stop operation and faster recharge acceptance for daily driving and spirited commuting in a Mitsubishi Eclipse.
Less Ideal for: Drivers who need the highest cold-cranking amps for extreme cold starts or who prefer batteries with long proven field histories and extended published lifespan data should consider alternatives.
- AGM design reduces leakage risk and allows maintenance-free operation.
- Built for start-stop systems to improve fuel efficiency and reduce emissions during city driving.
- Faster charge acceptance than standard SLA batteries for quicker recovery after discharge.
- Corrosion-resistant alloy claimed to improve durability and long-term reliability.
- Specified capacity and cold-cranking performance may be lower than some OEM high-CCA batteries for heavy-duty cold starts.
- Fitment and terminal orientation must be confirmed against the Eclipse battery tray and connector before purchase.
- Long-term lifespan data under severe climates or heavy parasitic drain is not provided in the listing.
Verdict A sealed AGM start-stop replacement that brings faster charging and maintenance-free operation for Mitsubishi Eclipse owners who want improved start-stop performance, provided you confirm physical fit and terminal compatibility.
3. Relistart 12V 60Ah Group 47 AGM Start-Stop Car Battery (680 CCA)
| Voltage | 12V |
|---|---|
| Capacity | 60Ah |
| Cold Cranking Amps | 680 CCA |
| Reserve Capacity | 105 RC |
This Relistart Group 47 AGM battery is a sealed, maintenance-free replacement designed for vehicles that accept BCI Group 47 batteries, delivering 60Ah capacity with 680 CCA and a 105 minute reserve. It is intended for typical engine starts and repeated shallow discharge cycles found in start-stop systems and cars with extra electrical accessories. The battery’s AGM construction gives better vibration resistance and lower self-discharge than conventional flooded batteries, so it is practical for drivers who use their car regularly and want a longer cycle life. Charging specs and a wide operating temperature range mean it will start reliably in cold weather and tolerate hot climates. Expect straightforward installation if terminal placement and dimensions match the Eclipse’s battery tray and cable polarity. Limitations are that it is a direct Group 47 fit only, so confirm physical clearance and hold-down compatibility for a Mitsubishi Eclipse, and it does not include vehicle-specific adapters or a multi-year warranty detail in the listing.
Best for: Cost-conscious owners who prioritize a reliable, budget-friendly replacement battery for regular daily driving and want the benefits of AGM technology without a premium brand price.
Less Ideal for: Drivers seeking a battery with an extended manufacturer warranty, dealer-installed fitment, or a custom solution for heavily modified electrical systems should consider higher-end or dealer-supplied options.
- AGM design provides maintenance-free operation and improved vibration resistance
- 680 CCA and 60Ah capacity supply solid starting power for cold starts and accessories
- Lower self-discharge for longer storage life between uses
- Engineered for start-stop systems and higher electrical demands compared with basic flooded batteries
- Requires verification of physical dimensions and terminal placement to fit the Eclipse battery tray
- No vehicle-specific adapters or explicit long-term warranty information included in the listing
Verdict A budget-friendly Group 47 AGM battery that delivers strong starting power and start-stop capability for Mitsubishi Eclipse owners who confirm fitment and want reliable, maintenance-free performance.
4. Mighty Max Battery MM-H5 Group 47 12V 60Ah AGM Car Battery
| Voltage | 12V |
|---|---|
| Capacity | 60 Amp Hours |
| Cold Cranking Amps | 680 CCA |
| Reserve Capacity | 100 minutes |
| Terminal | Stud Terminal |
The Mighty Max MM-H5 is a sealed AGM car battery designed to deliver dependable starting power and stable accessory support. It provides 680 CCA and a 100-minute reserve capacity, so it handles cold starts and short accessory draws without rapid voltage sag. The AGM construction means the battery is maintenance-free and spill-proof, which simplifies installation and reduces corrosion risk compared with flooded batteries. It mounts in multiple positions and includes mounting screws for a straightforward swap into the battery tray. Practical benefits for everyday use include strong cold-cranking ability, resistance to vibration, and a sealed design that is safer in tight engine bays. Limitations to consider are that the battery is a universal fit and may require checking terminal orientation and clearance in the Eclipse engine bay, and some buyers report mixed long-term reliability and customer-service experiences, so keep records for warranty follow-up. For a risk-averse buyer who wants a maintenance-free replacement with good starting performance, this is a pragmatic option.
Best for: A practical, risk-averse Mitsubishi Eclipse owner who prioritizes a maintenance-free, factory-quality replacement that delivers reliable starting and straightforward installation.
Less Ideal for: Drivers seeking an exact OEM-branded battery swap or those unwilling to troubleshoot minor fitment or terminal orientation differences should consider dealer or model-specific options instead.
- AGM sealed design reduces spill risk and requires no maintenance
- 680 CCA provides strong cold-start performance
- 100-minute reserve capacity supports electronics when the engine is off
- Rugged construction resists vibration and shock
- Includes mounting screws for easier installation
- Universal fit may require verification of terminal position and physical clearance in the Eclipse bay
- Some customers report inconsistent long-term durability and warranty support
Verdict A maintenance-free AGM choice that gives Mitsubishi Eclipse owners strong starting power and practical, spill-proof installation but check fitment and be prepared for varied long-term experiences.
5. 1AUTODEPOT Group 47 (H5) 12V AGM Car Battery, 60Ah, 680 CCA
| BCI Group Size | 47 (H5) |
|---|---|
| Rated Capacity | 60 Ah |
| Cold Cranking Amps (CCA) | 680 A |
| Reserve Capacity (RC) | 100 min |
| Battery Technology | AGM |
This 1AUTODEPOT Group 47 (H5) AGM battery is a maintenance-free replacement designed to provide reliable starting power and longer cycle life than a standard flooded battery. It is typically used as a direct-fit replacement for vehicles that accept Group 47/H5 batteries, supplying 12 volts and 680 cold cranking amps for confident cold starts and a 100-minute reserve capacity for short accessory loads. Notable features include AGM construction for low self-discharge, non-spillable design and improved vibration resistance, which helps longevity in daily-driven cars. Practical benefits include strong cranking performance in varied temperatures, safer handling during installation, and reduced need for routine maintenance. Important limitations are that fitment depends on correct Group 47 dimensions and terminal orientation so confirm compatibility with the Mitsubishi Eclipse battery tray and cable layout before buying, and this battery may be heavier than flooded alternatives which can make installation awkward without gloves or help.
Best for: Practical optimizers who want the best balance of performance and long-term value for a replacement battery and prioritize durability and low upkeep over lowest upfront cost.
Less Ideal for: Drivers who need a guaranteed fit without checking tray dimensions or those who prefer a lighter temporary backup solution for occasional use.
- AGM design gives better vibration resistance and lower self-discharge than flooded batteries
- 680 CCA provides solid cold-start performance for most climates
- Maintenance-free, non-spillable construction simplifies handling and installation
- Up to twice the cycle life of conventional flooded batteries for longer replacement intervals
- Requires verification of Group 47 (H5) dimensions and terminal positions to ensure fit in the Eclipse
- Heavier than flooded batteries which can make solo installation more difficult
Verdict A cost-conscious, durable AGM replacement that boosts starting power and lifespan for Mitsubishi Eclipse owners who confirm Group 47 fitment.
6. OPTIMA Batteries RedTop 35 Sealed AGM Starting Battery
| Voltage | 12-Volt |
|---|---|
| Cold Cranking Amps | 720 CCA |
| Terminal | SAE Terminal |
| Capacity (C20) | 44 AH |
| Reserve Capacity | 90 minutes |
The OPTIMA RedTop 35 is a sealed AGM starting battery built to deliver reliable starting power in a range of conditions. It uses a SpiralCell design and sealed construction so it is non-spillable and can be mounted in multiple orientations, which helps when fitting into tight battery trays on sports cars like the Mitsubishi Eclipse. With 720 CCA and a reserve capacity of 90 minutes, it provides quick, consistent cranking in cold weather and handles repeated starts better than many conventional flooded batteries. The battery is maintenance free and claims high vibration resistance and faster recharge, which suits an active daily driver or enthusiast who occasionally track or off-road the car. Downsides are its heavier weight and higher upfront cost compared with basic lead-acid replacements, and some owners report variable longevity depending on vehicle charging system and usage patterns. Also its SAE post terminals and physical footprint should be checked against the Eclipse battery tray and hold-down to ensure a correct fit without modification.
Best for: A balanced all-round buyer who wants a durable, low-maintenance starting battery that prioritizes reliable starts and durability for daily driving and occasional spirited use in a Mitsubishi Eclipse.
Less Ideal for: Drivers seeking the lowest initial purchase cost or the absolute lightest weight for performance tuning should consider cheaper flooded batteries or a dedicated lightweight lithium option instead.
- High cold-cranking amps (720 CCA) for reliable starting in cold or demanding conditions
- Sealed AGM SpiralCell construction allows multi-position mounting and is non-spillable
- Strong vibration resistance for tougher driving or spirited use
- Maintenance free with faster recharge compared with many standard flooded batteries
- Higher upfront cost than conventional lead-acid batteries
- Heavier than lightweight alternatives which may affect handling marginally if swapped for a much lighter unit
- Some users report inconsistent lifespan tied to charging system health rather than the battery itself
Verdict A rugged, maintenance-free AGM starter battery that delivers dependable starting power for a Mitsubishi Eclipse but comes with higher weight and cost compared with basic replacements.
Choosing the Right Mitsubishi Eclipse Car Battery: Key Factors to Consider
Physical Size and Terminal Layout
A battery must fit securely in the Mitsubishi Eclipse battery tray and align with the existing hold-down and cable terminals. Incorrect group size or terminal position can cause installation issues, added stress on cables, or the need for adapter parts.
Verify the battery group size and terminal orientation before buying. Proper fit matters for safety, vibration resistance, and ensuring the battery stays properly clamped during normal driving and when encountering rough roads.
Cold Cranking Amps (CCA)
Cold cranking amps indicate how much starting current a battery can deliver at low temperatures. Higher CCA values provide more reliable starting performance in cold weather and for engines that draw larger startup currents.
Choose a battery with CCA appropriate for your climate and engine type. Too low a CCA rating can result in slow cranking or no-start situations in colder conditions, while a higher-than-necessary CCA offers a margin of reliability without harming performance.
Reserve Capacity and Reserve Power
Reserve capacity measures how long a battery can supply a minimum voltage to electrical systems with the engine off. It is useful during heavy accessory use, short alternator outages, or when you need to run lights and electronics with the engine not running.
Higher reserve capacity provides more buffer for short-term electrical draws and can reduce the likelihood of deep discharge. Consider your typical accessory use, such as frequent short trips or use of aftermarket electronics, when evaluating reserve ratings.
Expected Service Life and Construction
Battery longevity depends on internal construction, plate design, and overall build quality. Thicker plates, robust separators, and quality manufacturing processes generally translate to longer service life and better resistance to deep cycling.
Look for batteries with clear durability specifications and warranties that reflect expected lifespan. Understanding typical life expectancy helps balance upfront choice with long-term ownership costs and replacement intervals.
Maintenance Requirements and Type
Some batteries require periodic maintenance, such as topping off electrolyte in flooded designs, while others are sealed and maintenance-free. Maintenance needs affect ownership convenience and long-term reliability, especially if you are unable to perform regular checks.
If you prefer low upkeep, choose a sealed or maintenance-free option. If you are comfortable with occasional service, certain serviceable designs can offer cost or longevity advantages if properly maintained.
Warranty and Support
Warranty length and terms provide insight into manufacturer confidence and potential replacement options if a battery fails prematurely. Look for clear pro rata or free-replacement terms and an accessible process for claims.
A stronger warranty can offset concerns about early failure and reduce long-term ownership risk. Make sure warranty coverage aligns with how long you expect to keep the vehicle or the battery.
FAQ
How do I know which battery size fits my Mitsubishi Eclipse?
Check the vehicle owner manual or inspect the existing battery group size and terminal positions. Matching the physical dimensions and terminal layout ensures proper fit and prevents cable stress. If in doubt, consult a professional to confirm correct group size and hold-down compatibility.
What CCA rating should I choose for reliable starting?
Aim for a cold-cranking amps rating that meets or slightly exceeds the vehicle manufacturer’s recommendation. In colder climates, choose a higher CCA to compensate for reduced battery performance at low temperatures. Too low a CCA may lead to slow cranking in winter.
Can I install a Mitsubishi Eclipse car battery myself?
Many owners can perform a battery swap with basic tools by disconnecting the negative terminal first, removing the hold-down, and reversing the steps for the new unit. Ensure correct terminal connections and secure mounting. If you are unsure about electrical connections or safety precautions, seek professional installation.
How can I test if my car battery is failing?
You can check for slow cranking, dim headlights at idle, or a dashboard battery warning. For more precise assessment, use a multimeter to measure resting voltage and a load tester or battery analyzer to evaluate cranking capacity. Professional shops can provide definitive testing if results are unclear.
How long should a car battery typically last in a Mitsubishi Eclipse?
Battery life often depends on usage patterns, climate, and maintenance. Many batteries last several years under normal driving conditions, but frequent short trips, extreme temperatures, and deep discharges can shorten lifespan. Regular checks and proper charging behavior help maximize service life.
How We Chose the Best Mitsubishi Eclipse Car Battery
We focused on batteries that match the physical size and terminal layout used in the Mitsubishi Eclipse, ensuring straightforward installation and proper hold-down compatibility. Cold-cranking amps were a primary filter because sufficient starting power is essential in cooler temperatures and for engines that require higher initial current. Reserve capacity and overall amp-hour characteristics were evaluated to understand how long a battery can support accessories and brief engine-off use. Durability and expected service life were considered by looking at construction features, such as plate thickness and manufacturing processes that typically affect longevity. We also prioritized batteries with reliable warranty coverage and clear specifications to aid ownership decisions. Exclusions: we did not include batteries that require nonstandard mounting, those lacking clear spec sheets, or units intended solely for specialty vehicles rather than standard engine starting use.
Our full evaluation process is outlined in our review methodology.
Conclusion
Prioritize a battery that matches the physical size and terminal layout of the Mitsubishi Eclipse while offering adequate cold-cranking amps for your climate and sufficient reserve capacity for your electrical use. Balance expected service life and maintenance needs against warranty coverage to find the most practical long-term option. Tradeoffs are common: higher CCA and reserve capacity usually increase durability but may mean a heavier unit. Consider how you drive and where you live to decide which attributes matter most.
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