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OPTIMA® Batteries 8020-164 35 REDTOP® Starting Battery - I&M Electric
  • SKU: OPT-8020-164

OPTIMA® Batteries 8020-164 35 REDTOP® Starting Battery



  • Strongest five-second starting burst
  • Up to two times longer life
  • More than 15 times the vibration resistance
  • Completely spillproof, mountable in virtually any position
  • Maintenance-free
  • Faster recharging
  • Optimal starting power

OPTIMA® REDTOP® 35 Ultra high-performance SPIRALCELL TECHNOLOGY® AGM (absorbent glass mat) battery with reliable cranking power for your auto, car or truck and twice the life. The OPTIMA® REDTOP® will outperform and outlast traditional batteries in demanding cranking/starting applications. The ultimate high-CCA starting battery for vehicles that have alternators capable of keeping up with all electrical loads.
If you have demanding electrical accessory loads such as winches, audio systems, and other devices, take a look at the YELLOWTOP® product line.
The OPTIMA® model number for this battery is 35. If you are replacing an OPTIMA® battery you already have, this model is the same as batteries marked 8020-164, 9020-164, 27936, RED35, SC35A, or N9935RED.
Includes applicable installation and/or height adapters for this battery

*Pricing is based on exchange unit


Battery Model: 35
Part Number: 8020-164
NSN: Number applied for, product currently available
UPC Code: 8 11405 00164 2

Performance Data

Cold Cranking Amps: 720
Cranking Amps: 910
Nominal Voltage: 12 volts
Open Circuit Voltage (fully charged): 12.8 volts
Internal Resistance (fully charged): 0.0030 ohms
Capacity: 44 Ah (C/20)
Reserve Capacity: BCI: 100 minutes (25 amp discharge, 80°F (26.7°C), to 10.5 volts cut-off)

Physical Characteristics

Plate Design:

High purity lead-tin alloy.  Wound cell configuration utilizing proprietary SPIRALCELL TECHNOLOGY®.


Sulfuric acid, H2SO4

Case: Polypropylene
Case Color: Dark Gray
Cover Color: “OPTIMA“ Red
Group Size: BCI: 35
Post Type: SAE Post
Weight: 31.7 lb
Length: 9.38 in
Width: 6.75 in
Height: 7.69 in


CCA (BCI 0°F): 720 amps
MCA (BCI 32°F): 910 amps

Recommended Charging

The following charging methods are recommended to ensure a long battery life: (Always use a voltage regulated charger with voltage limits set as described below.)
Model: 25 and 35 These batteries are designed for engine starting applications.  They are not recommended or warranted for use in deep cycle applications.

Recommended Charging Information

Alternator: 13.3 to 15.0 volts; no amperage limit
Battery Charger: 13.8 to 15.0 volts; 10 amps maximum; 6-12 hours approximate
Float Charge: 13.2 to 13.8 volts; 1 amp maximum current (indefinite time at  lower voltages)
Rapid Recharge (Constant voltage charger): Maximum voltage 15.6 volts. No current limit as long as battery  temperature remains below 125°F (51.7°C).  Charge until  current drops below 1 amp.  All limits must be strictly adhered to.