There's not another battery in the world that works as hard as the OPTIMA® battery. Especially against the number one enemy: vibration. The unique SPIRALCELL® Technology used in the construction of the OPTIMA® YellowTop S 5.5 battery makes it an excellent power source for demanding heavy duty engine starting and deep cycle applications.

Deep Cycle Batteries for Professional Use

OPTIMA® YellowTop batteries are guaranteed to deliver uninterrupted power throughout the entire discharge cycle. The ability to hold a higher voltage during the discharge cycle makes it possible to utilise more of the stored power in the OPTIMA®, compared to ordinary batteries. Plus, it's spill-proof, highly resistant to extremes of temperature and can be stored for long periods without maintenance.

OPTIMA®'s YellowTop last up to twice as long as traditional batteries, so if you rely on your vehicle to earn a living, you demand consistent high performance from all the parts you put into it. Unexpected downtime due to a battery failure can waste time and money and put you behind schedule. OPTIMA® YellowTop batteries are made to endure the extremes of commercial, heavy duty use and keep you moving.

NONSPILLABLE AND MAINTENANCE FREE OPTIMA® batteries are completely sealed and maintenance free, providing a solution for applications where flexibility in mounting is needed.

Optima batteries, incorporating patented SPIRALCELL® Technology, are still performing strong long after traditional batteries have died. Even after extended accessory use, you'll still have plenty of power to keep things going.

Where loud comes from

OPTIMA® YellowTop batteries, featuring SPIRALCELL® Technology, are designed for all of your deep cycle needs. It's perfect for people who are serious about sound. OPTIMA®'s power is cleaner with higher voltage output than conventional batteries enabling you to play your system louder and longer. They have a greater cycle life so they can be drained and recharged more often. Plus, they're spill-proof and can withstand 15 times the vibration of ordinary batteries.

Compact Power

New developments have created demanding electrical systems requiring a high performance deep-cycle automotive battery. OPTIMA® batteries can meet the needs of enthusiasts in the performance market. Our new YellowTop deep cycle YT 2.7 and YT 3.7 are ideally suited to meet your power needs.

Unparalleled Vibration Resistance

Using OPTIMA SPIRALCELL® Technology, cells are tightly compressed into supportive chambers, giving OPTIMA® batteries over 15 times more vibration resistance than traditional batteries. This translates into longer battery life in high vibration applications.

Completely spill-proof

Due to its completely sealed case, the OPTIMA® battery is extremely safe and corrosion resistant. Acid can't leak or spill, making them clean, user-friendly and environmentally sound. In addition, the maintenance free sealed case design eliminates the need to add water or clean terminals.

Dual Purpose (Starting and Deep Cycle) Batteries for Professional Use

OPTIMA® YellowTop is designed to be fitted and forgotten! No matter the conditions, be it damp, heat, cold, dirt or exposure to extremes in vibration or regular discharge, you can count on OPTIMA® to deliver uninterrupted reliable power. OPTIMA®'s ability to hold a higher voltage during the discharge cycle makes it possible to utilise more of the stored power in the OPTIMA® compared to ordinary batteries. The YellowTop can endure many charge / discharge cycles without losing significant capacity. OPTIMA® batteries are also ideal for seasonal use because of its very low rate of self-discharge.

Thus allowing you to store your seasonal vehicles (classic car / boat) throughout the winter, without the need for regular charging and still spring out of the starting block when winter is over.

OPTIMA® YellowTop - Technical Specs 

DUAL PURPOSE (STARTING & DEEP CYCLE) BATTERIES
MODEL NUMBER	YT S 5.5	YT S 4.2	YT U 4.2	YT R 3.7	YT S 2.7 YT R 2.7
PERFORMANCE
Voltage (V)	12	12	12	12	12
Cold Cranking Amps @ -18°C (A)	975	765	765	660	460
Cranking Amps @ 0°C (A)	1125	870	870	810	575
Reserve Capacity (Minutes)	155	120	120	98	66
Capacity (C/20 Rate) (Ah)	75	55	55	48	38
Internal Resistance (ohms)	0,0025	.0028	.0028	.0030	.0046
PHYSICAL SPECS
Length (mm)	325	254	254	237	237
Width (mm)	165	175	175	172	129
Height (mm)	238	200	200	197	227
Mimimum Weight (kg)	26,5	19,5	19,9	16,6	11,6
Type Post/Terminal	3/8 Stainless SAE Dual SAE & GM SAE SAE
BCI Group	31A	34	34/78	35	51 & 51R

Charging Info

The following charging methods are recommended to insure a long battery life (Always use a voltage regulated charger, with voltage limits set as described below):

All OPTIMA® YellowTop Batteries
These batteries are dual purpose. They are designed for engine start and cyclic applications and for use in vehicles with large accessory loads.

Recommended charging information:

Alternator:
13.65 to 15.0 volts, no amperage limit.

Battery charger:
13.8 to 15.0 volts, 10 amps maximum, 6-12 hours approximate.

Cyclic Applications:
14.7 volts, no current limit as long as battery temperature remains below 50°C (125°F). When current falls below 1 amp, finish with 3 amp constant current for 1 hour for YT S 5,5.and 2 amp constant current for 1 hour for all other types.

Rapid Recharge:
Maximum voltage 15.6 volts (regulated).
Maximum current: No limit as long as temperature <50°C (125°F).
Maximum recharge time: Charge until current drops below 1 amp.

Float charge:
13.2 to 13.8 volts, 1 amp maximum current, time indefinite (at lower voltage).

All limits must be strictly adhered to.
 
Safety Information:

Always wear safety glasses when working with batteries.

Always use a voltage regulated battery charger with limits set to the above ratings. Overcharging can cause the safety valves to open and battery gasses to escape, resulting in premature failure. These gasses are flammable! You cannot replace water in sealed batteries that have been overcharged. Any battery that becomes very hot or makes a hissing sound while recharging should be disconnected immediately.

Failure to fully charge a battery can result in poor performance and a reduction in capacity