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Home UPS-Flooded Tubular Plate,Premium-STANTUBULAR Range
Tubular Technology   Resistance to Abuse
High Acid Volume per AH Electrolyte level indicator
Deep Cycle Design Tower type Design
Common Side Venting Conforms to IS 13369 - 1992


Very Long Life

  Suited for use in areas of Frequent Power-cuts (800 to 1000 cycles of Deep Discharge as against 300/400 cycles of other Batteries)
User Friendly Can withstand Overcharge Better
Acid volume per AH is 30% more than ordinary Tubular Battery, acts as a Coolant and ensures Very Low Maintenance Occupies Less Floor Space, totally new Look
Ensures Consistent Quality   Less Polluting, Environment Friendly


Home UPS & Inverters
Rated Capacity (Ah) at 27°C (1.280 sp.gr.) Dimensions (mm) ± 3 mm Weight ± 5%, (Kg)
20 Hr @ 1.75V/Cell 10 Hr @ 1.75V/Cell 5 Hr @ 1.75V/Cell 3 Hr @
1 Hr @
Length Width Height* Dry Filled
ST500 12 150 120 100 86 60 500 187 430 31.00 56.80
ST550 12 165 135 112 97 68 500 187 430 35.33 57.50
ST650 12 200 160 133 115 88 500 187 430 45.00 72.00

* the height mentioned is up to terminal top.

Rated Capacity (Ah)
at 27°C, 20 Hr @ 1.75V/Cell
Initial Charge at Constant Current (A) Minimum Ah Input During Initial Charge Approx. Acid Qty (1.220 Sp. Gr.) in ltr Constant Potential Limiting Current (A) Trickle Charge Current (mA)
Start (upto 2.36 vpc) Finish (upto 2.75 vpc) Min Max
ST500 12 150 14.4 7.2 540 23.80 30 120 480
ST500 12 165 16.0 8.0 610 20.00 34 135 540
ST650 12 200 19.2 9.6 720 21.60 40 160 640
Initial Charging Instructions
Filling in specific gravity 1.220 ± 0.005 at 27 °C  

In case the temperature exceeds 50 °C, adequate rest to be given till the electrolyte temperature comes to ambient temp. and charging to be continued

Rest period 12 hrs.

In case the temperature exceeds 50 °C, adequate rest to be given till the electrolyte temperature comes to ambient temp. and charging to be continued
Minimum Ah input as per above chart. Condition of fully charged –
In order to reduce the charging time, the initial charging current would be as specified till 2.36 Volts/Cell followed by finishing current as specified till 2.75 Volts/Cell.  
  3 consecutive hourly readings of specific gravity and voltage become constan
  Top of charge voltage will be around 16.2V – 16.5V
  All cells should gas freely.
  Minimum Ah has been given
However in both cases, Minimum Ah input to be given. Under no circumstances, battery temperature should exceed 50 °C.   Specific gravity at fully charged condition – 1.250 ± 0.005 at 27 °C

Normal Recharging Instructions

Battery should be re-charged through an Inverter at constant potential mode of 14.4V with limited current as specified. After battery potential reaches 14.4V, the battery should continue in float charge mode at constant potential of 13.8V.

Statutory Notice

All batteries contain lead, which is harmful for humans and environment. As per statutory requirements, the used battery must be returned to the authorized dealer, manufacturer or at the designated collection centers.


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