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Classic-car 6V batteries are a classic-vehicle fitment, not a generic low-voltage purchase. The current starting-battery market is concentrated in BCI Group 1 and Group 2 cases; they differ in length, so a Group 1 will not automatically replace a Group 2 tray. Check the vehicle manual or the old battery for group size, physical dimensions, post polarity, hold-down clearance, and the required cold-cranking rating. Every model below is a 6V flooded or AGM starting battery, not a GC2 golf-cart deep-cycle unit. Prices are current retailer listings before any refundable core charge, and availability can be local because lead-acid batteries often cannot ship normally.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | OPTIMA RedTop 6V | $269.99 per battery | Amazon |
| 2 | Duralast 1-6VOLT640-DL | $129.99 per battery | Amazon |
| 3 | Continental 1-6V | $134.99 per battery | Amazon |
| 4 | Interstate 1-VHD | $119.99 per battery | Amazon |
| 5 | Deka 901MF | $123.88 per battery | Amazon |
| 6 | John Deere TY21731B | $123.17 per battery | Amazon |
| 7 | Interstate 2-XHD | $169.95 suggested retail per battery | Amazon |
| 8 | Exide 2-EX | $122.21 per battery | Amazon |
The picks, in detail
OPTIMA RedTop 6V
Optima’s RedTop is the unusually premium Group 1 choice: it uses AGM construction rather than a conventional flooded case and is rated at 800 CCA. AutoZone lists a three-year warranty and $269.99 price. It suits a correct Group 1 application where maintenance-free AGM construction and high published cranking output justify the substantial price premium.
- BCI Group 1 and 6V nominal voltage
- 800 CCA rating
- Absorbent glass mat construction
- Three-year AutoZone warranty
- Only AGM model in this verified starting-battery group
- 800 CCA is the highest published CCA here
- $269.99 price is far above flooded alternatives
- Still requires a Group 1 tray and correct terminal orientation
Duralast 1-6VOLT640-DL
This Duralast Group 1 commercial battery is a conventional flooded 6V unit with 640 CCA, 82 Ah, and 160 minutes reserve capacity at a 25-amp draw. Its published terminal layout is negative top-left rear and positive top-right front. That orientation and its 9 by 6.875 by 8.75-inch case are the fitment details to check before choosing the $129.99 listing.
- Part 1-6VOLT640-DL; BCI Group 1
- 640 CCA and 82 Ah at the 20-hour rate
- 30.24-pound listed weight and 8.75-inch height
- SAE Type A posts; positive terminal at top-right front
- 160-minute reserve-capacity figure is stated by the retailer
- AutoZone lists a $129.99 retail price before the core charge
- Flooded battery needs the usual acid-battery handling and installation care
- One-year warranty is shorter than the Optima coverage
Continental 1-6V
Continental’s 1-6V is a 625-CCA Group 1 flooded battery sold for automotive, commercial, and farm applications. Its listed dimensions are 9.13 by 7.13 by 9.38 inches, which are not interchangeable on assumption with every other Group 1 catalog entry. Continental Battery shows it in stock at $134.99 with a 12-month warranty, making dimensions the primary comparison point against the 640-CCA choices.
- SKU 1-6V; 6V BCI Group 1
- 625 CCA flooded lead-acid chemistry
- 9.13 x 7.13 x 9.38-inch listed dimensions
- 12-month warranty
- Live seller reports in-stock status at $134.99
- Explicitly categorized for automotive, commercial, and farm use
- 625 CCA is lower than several Group 1 competitors
- Published outer dimensions should be measured against the tray, not inferred from the group label
Interstate 1-VHD
Interstate’s 1-VHD is a flooded Group 1 commercial starting battery with 640 CCA, 130 minutes reserve capacity, and 750 cranking amps. The Auto Value listing names the part and prices it at $119.99 before its core charge. This is an appropriate candidate only when a 6V Group 1 battery is specified; its commercial labeling does not convert a 12V vehicle to 6V.
- Part 1-VHD; 6V BCI Group 1
- 640 CCA and 750 cranking amps
- 130-minute reserve capacity
- Flooded commercial starting-battery line
- Current retailer listing is $119.99 before core charge
- The exact Group 1, 640-CCA specification is plainly published
- Local pickup availability must be checked
- Six-month stated warranty is brief compared with most retail alternatives
Deka 901MF
East Penn Deka’s 901MF is a Group 1 flooded starting, lighting, and ignition battery with 640 CCA, 785 CA, and 130 minutes reserve capacity. Wholesale Batteries identifies right-positive polarity, DIN terminals, and a 9 by 6.875 by 8.75-inch case. Those terminal and polarity details are useful for an older vehicle whose original cable routing leaves little slack.
- Part 901MF; 6V BCI Group 1
- 640 CCA, 785 CA, and 130-minute reserve capacity
- Right-positive polarity with DIN terminals
- 9 x 6.875 x 8.75-inch case
- Current listing shows $123.88 and in-stock status
- 36-month limited warranty with 12-month free replacement
- Freight shipping is required outside the seller’s local delivery area
- DIN terminals must match the cable ends rather than being assumed equivalent to SAE posts
John Deere TY21731B
The TY21731B is a wet-charged, 90-Ah 6V Group 1 starter battery rated at 640 CCA and fitted with SAE automotive terminals. It is sold under the John Deere part number but is described for automotive, commercial, agricultural, and utility use. For a vintage vehicle with SAE clamps, the terminal type and published $123.17 price are more useful selection facts than the tractor-oriented branding.
- Part TY21731B; wet-charged 6V Group 1 battery
- 90 Ah and 640 CCA
- SAE automotive terminal type
- Heavy-duty polypropylene case and cover
- Seller lists it at $123.17 before checkout shipping
- SAE automotive terminals are explicitly specified
- Confirm the actual tray height and hold-down because the listing does not publish all external dimensions
- Wet-charged flooded construction is not maintenance-free AGM
Interstate 2-XHD
Interstate’s 2-XHD moves to the longer BCI Group 2 case and is a 6V flooded commercial starter battery, not a golf-cart deep-cycle product. Interstate publishes 625 CCA, 750 cranking amps, 150 minutes reserve capacity, a six-month warranty, and a $169.95 suggested retail price. Choose it only after confirming the vehicle needs Group 2 rather than the shorter Group 1 footprint.
- Part 2-XHD; 6V BCI Group 2
- 625 CCA and 750 cranking amps
- 150-minute reserve capacity at 25 amps
- Flooded heavy-duty starting battery
- Interstate publishes the current $169.95 suggested retail price
- Group 2 is a valid starting-battery choice for applications that require its case length
- Not interchangeable with Group 1 because the BCI case size differs
- Six-month warranty is limited
Exide 2-EX
Exide’s 2-EX is a Group 2, 6V flooded automotive and light-commercial starting battery rated at 625 CCA, 750 CA, 91 Ah, and 150 minutes reserve capacity. Sadler Powertrain lists the exact 2-EX in stock at $122.21. It is the lower-priced Group 2 option here, but its 10.375-inch Group 2 length must match the existing tray and hold-down.
- Part 2-EX; 6V BCI Group 2
- 625 CCA, 750 CA, and 91 Ah
- 91 Ah capacity with 150-minute reserve at a 25-amp draw
- Flooded lead-acid starting battery
- Live retailer listing shows $122.21 and in-stock status
- Published 12-month warranty is longer than the Interstate Group 2 listing
- Do not fit it into a Group 1 tray
- Flooded battery requires appropriate ventilation and safe handling during replacement
Buying tips
- Determine whether the original is BCI Group 1 or Group 2 by measuring the old case and tray; do not use voltage alone to choose.
- Match the positive and negative post locations and terminal style before disconnecting the existing battery, since older cable sets may not reach a reversed layout.
- Use a true 6V starting battery for a 6V starter system. A GC2 golf-cart battery is deep-cycle equipment and has different starting and case priorities.
- A 6V battery cannot replace a 12V starting battery; changing voltage requires a system-level vehicle conversion, not a battery swap.
- Compare price before the refundable core deposit, then ask the retailer about local pickup and core-return rules.
- Protect paint and skin from electrolyte, disconnect the grounded cable first, and follow the vehicle manual for polarity and charging-system checks.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.