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Sealed Lead-Acid Batteries

Low initial cost and easy maintenance are good reasons to choose Sealed lead acid (SLA) battery packs. Sealed lead acid has the lowest energy density of the rechargeable batteries. There are many instances, however, when sealed lead acid is an excellent choice. Sealed lead acid is a good choice when size and weight aren't critical factors and cost must be kept low. This chemistry is usually found in stationary applications like uninterruptible power supplies and emergency lighting. Because sealed lead acid is predictable and easy to maintain, it's a popular choice for medical applications. Read more

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Product Name  Model  Manufacturer+  Chemistry  Voltage  Capacity  PDF   
Lead-​Acid -​ HX-​50FR

HX-​50FR
Enersys Batteries
Lead-Acid
12
13.0AH
Spec Sheet
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Lead-​Acid -​ HX100FR

HX100FR
Enersys Batteries
Lead-Acid
12
28.0AH
Spec Sheet
Add to Quote

Lead-​Acid -​ HX135FR

HX135FR
Enersys Batteries
Lead-Acid
12
33.0AH
Spec Sheet
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Lead-​Acid -​ HX150FR

HX150FR
Enersys Batteries
Lead-Acid
12
40.0AH
Spec Sheet
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Lead-​Acid -​ HX205-​12FR

HX205-​12FR
Enersys Batteries
Lead-Acid
12
44.5AH
Spec Sheet
Add to Quote

Lead-​Acid -​ HX25FR

HX25FR
Enersys Batteries
Lead-Acid
12
5.0AH
Spec Sheet
Add to Quote

Lead-​Acid -​ HX300-​12FR

HX300-​12FR
Enersys Batteries
Lead-Acid
12
65.0AH
Spec Sheet
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Lead-​Acid -​ HX330-​12FR

HX330-​12FR
Enersys Batteries
Lead-Acid
12
81.0AH
Spec Sheet
Add to Quote

Lead-​Acid -​ HX35FR

HX35FR
Enersys Batteries
Lead-Acid
12
8.0AH
Spec Sheet
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Lead-​Acid -​ HX400-​12-​FR

HX400-​12-​FR
Enersys Batteries
Lead-Acid
12
85.0AH
Spec Sheet
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Lead-​Acid -​ HX500-​12FR

HX500-​12FR
Enersys Batteries
Lead-Acid
12
119.0AH
Spec Sheet
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Lead-​Acid -​ HX50FR

HX50FR
Enersys Batteries
Lead-Acid
6
13.0AH
Spec Sheet
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Lead-​Acid -​ HX800-​6

HX800-​6
Enersys Batteries
Lead-Acid
6
170.0AH
Spec Sheet
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Lead-​Acid -​ HX80FR

HX80FR
Enersys Batteries
Lead-Acid
12
20.0AH
Spec Sheet
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Lead-​Acid -​ NP0.8-​12

NP0.8-​12
Enersys Batteries
Lead-Acid
12
0.8AH
Spec Sheet
Add to Quote

Lead-​Acid -​ NP0.8-​12FR

NP0.8-​12FR
Enersys Batteries
Lead-Acid
12
0.8AH
Spec Sheet
Add to Quote

Lead-​Acid -​ NP1-​6

NP1-​6
Enersys Batteries
Lead-Acid
6
1.0AH
Spec Sheet
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Lead-​Acid -​ NP1-​6FR

NP1-​6FR
Enersys Batteries
Lead-Acid
6
1.0AH
Spec Sheet
Add to Quote

Lead-​Acid -​ NP1.2-​12

NP1.2-​12
Enersys Batteries
Lead-Acid
12
1.2AH
Spec Sheet
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Lead-​Acid -​ NP1.2-​12FR

NP1.2-​12FR
Enersys Batteries
Lead-Acid
12
1.2AH
Spec Sheet
Add to Quote

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There are many benefits to sealed lead acid. SLA isn’t affected by the so called "memory effect" that nickel batteries suffer from, and SLA has the best charge retention of any rechargeable battery. With SLA, it’s fairly easy to determine the remaining capacity based on open circuit voltage (OCV); it’s only about 20% accurate though.

There are some down sides to SLA. Bedsides the size and weight disadvantage, SLA won’t take a fast charge well, doesn’t perform well at low temperatures. SLA loses its charge quickly if stored at higher temperatures.

The exceptions are "pure lead" batteries which are capable of fast charging and perform well at lower temperatures. Pure lead batteries also have much better charge retention and recovery characteristics after long periods of storage (one or two years).

SLA batteries prefer a constant voltage charge. VRLA batteries can take a charge well from 7 hours at one-fourth the battery’s capacity in input current, C/4, to 14 hours at C/10 or one-tenth the battery’s rated capacity in input current. At these charge rates 2.45 volts per cell at 20° C is best. C/300 (capacity ¸ 300) is a good trickle or float charge current with 2.35/cell at 20°C. Also, the charge voltage must be lowered for temperature above 20°C and raised for temperature lower than 20°C. (See Third Chart Down)

Constant Current/Constant Voltage Charge Charicteristics

 


Charge Charicteristics for a Two Stage Costant Voltage Charger

 

Charge Voltage Compensation for Various Temperatures

  • Cell Voltage: 2.0V (nominal)
  • Capacity: 500mAh to 100Ah or more
  • Energy by Weight: 30 Watt Hour/Kilogram
  • Energy by Volume: Watt Hour/cubic centimeter
  • Cycle Life: 200-500 Cycles
  • Self Discharge: 5%/month
  • Temperature Range: -20° C to +60° C
  • Preferred Charge Methods: Constant Voltage C/10 to C/4
  • Applications:Communication equipment, Office equipment, Security systems, Small power tools, Toys, UPS systems, Communication equipment, Large power tools, Office equipment, Security systems UPS systems, Back-up for lighting equipment (used with solar cells), CATV, CVCF, Emergency lights, Engine starting (portable generator), PBX, Base stations, Large and small power tools and toys, Audio Communication equipment, Office equipment and VCRs

Discharge Charicteristics for a Typical 12 volt 7 Ampere Hour 
VRLA Battery


Discharge Charicteristics for a Typical 12 volt 7 Ampere Hour 
VRLA Battery

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