BATTERY TYPE
AMP HOUR RATING
VOLTAGE
Group 27
100-115 Amp hours
12 volts
Group 29
110-125 Amp hours
12 volts
U-2400
251 Amp Hours
6 Volt
A simple formula to find out how long a light will run off a particular
battery
is to take the batteries "amp-hour rating" and divide it by the average load in
amps.  So, a 115-amp hour battery running a 100-watt light that pulls 8-amps should
last approximately 14.4 hours (115/8).   Please See
Run Time to determine how many
amps each light uses, and how long they will run on different batteries.
Notice: For best performance a Group 27, 115 amp hr. Deep Cycle battery or
better is recommended.   While these lights are extremely bright, they require
sufficient amperage to operate at maximum brightness.  If you are using a
generator or have an AC outlet on your dock, you can power your lights with a
AC to DC converter or battery charger.  Also see 120VAC lights.

Always use a converter that puts out more amperage than you need.
The more amperage...the brighter the light will be!  

Your lights are only as good as your battery or power supply.
Underwater Fishing Lights & Dock Lights
"Starting Batteries"
vs
"Deep Cycle Batteries"

Both "Starting" batteries and most "Deep Cycle" batteries are lead-acid
batteries that use exactly the same chemistry for their operation. The difference
is in the way that the batteries optimize their design:

A "Starting Battery" is designed to provide a large
amount of current for a short period of time.

This surge of current is needed to turn the engine over during starting. Once
the engine starts, the alternator provides all the power that the car needs, so a
starting battery may go through its entire life without ever being drained of
more than 20 percent of its total capacity. Used in this way, a starting
battery can last a number of years. To achieve a large amount of current, a
starting battery uses thin plates to increase its surface area.

A "Deep Cycle Battery" is designed to provide a steady
amount of current over a long period of time.

A Deep Cycle Battery can provide a surge when needed, but nothing
like the surge a car battery can. A deep cycle battery is designed to be deeply
discharged over and over again (this is something that would ruin a car battery
quickly). To accomplish this a deep cycle battery uses thicker plates.

A Starting Battery typically has two ratings:
CCA (Cold Cranking Amps) - The number of amps that the battery can produce
at 32 degrees F (0 degrees C) for 30 seconds

RC (Reserve Capacity) - The number of minutes that the battery can deliver 25
amps while keeping its voltage above 10.5 volts

Typically, a
Deep Cycle Battery will have two or three times the RC of a Starting
Battery
, but it will deliver one-half or three-quarters the CCAs. In addition a
deep cycle battery can withstand several hundred total discharge/recharge
cycles, while a Starting battery is not designed
to be totally discharged before recharging.

The bottom line is...
Use Marine "Deep Cycle Batteries" for your lights and
trolling motor
, and a "Marine Starting battery" for starting your boat
Pier Lights
Battery Facts
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