We offer a vast range of Sealed Maintenance Free Batteries(SMF) with no requirement to add water and it’s completely sealed. SMF batteries look different than other battery types. They are more compact because there is no free electrolyte(it is used in the form of gel which files the cavity of plates) making them more “volume efficient” and taking less space for their energy storing capacity. Because they are filled with electrolyte only one time during activation, so there are no filler caps. Instead a sealing plug permanently covers the filler ports. Also, there is no vent tube in this battery.
The construction of this type battery causes internal freed gas to recombine inside the battery, so no vent tube is required. SMF battery can be sealed because inside the battery, the negative plates are never fully charged and therefore don’t produce hydrogen gas. The positive plates create oxygen during the discharge process but instead of the oxygen being forced out a vent tube, it reacts with the charged active material on the plates to become water until the battery is charged and the water is transformed into acid. This process is called recombinant technology and this design is what makes our batteries unique.
A “factory activated” battery does not require filling before installation. An extensive activation process ensures complete absorption of the electrolyte so no liquid acid is contained within the battery. This process allows these batteries to be shipped from the factory ready to install. 


Item Model Voltage(V) Capacity(Ah) Terminal L(mm) W(mm) H(mm)
1 6N4-2A-4 6 4 + ,- 71 71 96
2 12N5-3B 12 5 -, _ 120 61 130
3 YB5L-BS 12 5 -, _ 120 61 130
4 YB7B-B 12 7 +, – 150 60 130
5 12N7A-3A 12 7 -, + 150 60 130
6 12N7-3A 12 7 -, + 137 77 126
7 12N7-4B 12 7 +,- 137 77 126
8 12N7-3B 12 7 -,+ 137 77 126
9 12N9-4B 12 9 +, – 137 77 136
10 12N9-4B-1 12 9 +, – 133 77 136
11 12N9-BS 12 9 +, – 133 77 136
12 12N9-3B 12 9 +, – 133 77 136
13 YB2.5L-BS 12 2.5 -,+ 80 77 105
14 GTX3L-BS 12 3 -,+ 98.5 56 109
15 GT4L-BS 12 4 -,+ 114 70 85
16 GTX4L-BS 12 4 -,+ 114 70 85
17 GTZ5S-BS 12 4 -,+ 114 70 85
18 GTZ7S 12 5 -,+ 114 70 105
19 GTX5L-BS 12 5 -,+ 114 70 105
20 GT5AL-BS 12 5 -,+ 114 70 105
21 YB6.5L-B 12 6.5 -,+ 139 66 100
22 12N6.5L-BS 12 6.5 -,+ 139 66 100
23 GTX7A-BS 12 7 +,- 150 87 93
24 GTZ10 12 8 +,- 150 87 93
25 GTX7L-BS 12 7 -,+ 114 70 130
26 GTX12A-BS 12 10 +,- 150 87 105
27 GTX9-BS 12 9 +,- 150 87 130
28 GTX12-BS 12 2 +,- 150 87 145
29 GTX14-BS 12 14 +,- 152 87 145
30 GTZ14 12 11 +,- 150 87 110

How to Charge Battery

Sealed Battery Charging Procedure:

Sealed Type Batteries require higher charge than Dry Charge or Conventional types. Make sure you never charge this battery type with Conventional Battery Charger. You should rather choose professional quality chargers.

Sealed types of batteries come pre-activated from factory which means electrolytes are already added in the battery and the case is sealed. Given below are a few instructions to follow:

  • Connect cablesto the battery terminals before turning on the charger, red cable goesto positive (+) terminal and black to negative terminal (-)
  • Gel batteries or SMF batteries should never be charged at more than 14.4V as it can damage the battery
  • Initially go for low amperage when charging or look at instructions provided with the battery to charge at a specific amperage
  • Load test the battery at 3 times its ampere hour rating for 15 secs or use and automatic battery tester to determine the battery condition and then check the voltage
  • Voltage should be minimum 12.4V on a 12V battery
  • Battery is then ready to be fitted
  • If the voltage reading is below 12.4V or the battery fails the automatic battery test, repeat the charging and test cycle.


Technical Features

  1. Sealed Construction
    The unique construction and sealing technique ensure no electrolyte leakage from case or terminals.
  2. Electrolyte Suspension System
    All batteries utilize Kiyoshi’s unique electrolyte suspension system incorporating a microfine glass mat to retain the maximum amount of electrolyte in the cells. The electrolyte is retained in the separator material and there is no free electrolyte to escape from the cells. No gels or other contaminants are added.
  3. Recombination Technology
    The design of Kiyoshi’s batteries incorporates the very latest oxygen recombination technology to effectively eliminate the need for watering during normal use.
  4. Low Maintenance Operation
    Due to the perfectly sealed construction and the recombination of gasses within the cell, the battery is almost maintenance free
  5. Terminals
    Batteries are manufactured using a range of terminals which vary in size and type. Please refer to details as shown below:

Terminal Configurations

Terminal shapes vary from one battery to another. By identifying the correct replacement battery from the listing in this book, you are assured of the proper terminal configuration.


Batteries can be dangerous, so you have to make sure that some simple safety precautions are always followed. Working with batteries poses two hazards: potentially explosive gases that are given off during charging, and sulfuric acid that are very corrosive.
Here’s an 8-point list that’ll help keep those hazards under control:
  • Absolutely no smoking, sparks or open flames around batteries. Batteries can produce hydrogen and oxygen; if they ignite the battery can rupture.
  • On conventional batteries, loosen vent caps when charging and ventilate the entire charging area. A build-up of hydrogen and oxygen levels in the battery or in the room where it’s being charged can create a hazard.
  • If a battery feels hot to touch during charging, stop charging and allow it to cool before resuming. Heat damages the plates, and a battery that’s too hot can rupture.
  • Never put the red sealing cap back on the battery once you take it off. If you do, gases trapped inside can explode. Make sure the vent tube isn’t kinked or blocked, for the same reason.
  • Connect the charger to battery properly: positive to positive, negative to negative. Unplug the charger or turn it off before you disconnect the lead: that cuts down on the chance of sparks.
  • Always wear eye protection, protective gloves and protective clothing.
  • Clean up acid spills immediately, using a water and baking soda solution to neutralize (1 lb. baking soda in 1 gal. water).
  • Make sure acid container is clearly marked and the work area is well lighted.

If sulfuric acid is swallowed or splashed in the eyes, take immediate action. While the diluted sulfuric acid used as electrolyte can burn the skin, this type of injury is generally less serious. Sulfuric acid in the eyes can cause blindness. Serious internal injuries or death can result from ingesting sulfuric acid.


  • External – Flush with water
  • Internal – Drink large quantities of milk or water, followed by milk of magnesia, vegetable oil or beaten eggs. Call a poison control center or doctor immediately
  • Eyes – Flush for several minutes with water, get immediate medical attention

Points To Remember

  • Ventilate battery charging area
  • Charging gives off gases – no smoking, sparks or flames
  • Safety glasses or face shields protect against eye damage
  • Acid swallowed or in the eyes requires immediate antidotes and medical care
  • All safety considerations are important… review them frequently.

Battery Testing Devices

How much of a charge does a battery have? There are two easy and reliable ways to find out:
  • A hydrometer, which comes in floating ball and calibrated float types, or
  • A voltmeter (or multimeter, which gives DC voltage readings).
  • Which is the best?

    If you’re choosing between two hydrometers, opt for the calibrated float type. It gives you an exact specific gravity reading (that is, the density of the electrolyte compared to water), that’s much more accurate than floating balls. A voltmeter or multimeter can be used where a hydrometer can’t. Most sealed or low maintenance batteries have to be tested with a voltmeter.

    Battery testing requires a voltmeter that can measure DC voltage. Remember to always connect a voltmeter parallel to the circuit being tested, observing polarity; otherwise, the pointer will travel in the wrong direction. It’s a good idea to periodically check a voltmeter against another one of known accuracy.


    There are two types of battery tests: Unloaded and Loaded. An Unloaded Test is made on a battery without discharging current. It’s simplest and most commonly used. And if you need a precise reading, loaded testing is the answer. It’s more accurate.

    Unloaded Testing

    Check charge condition using either a hydrometer or voltmeter. With a voltmeter, voltage readings appear instantly to show the state of charge. Remember to hook the positive lead to the battery’s positive terminal, and the negative lead to the negative terminal.

    A hydrometer measures the specific gravity of each cell. The specific gravity tells the degree of charge: generally, a specific gravity of about 1.265 to 1.280 indicates a full charge. A reading of 1.230 to 1.260 indicates the battery should be charged before testing. The chart below shows the charge level as measured by syringe float hydrometer, digital voltmeter and five – ball hydrometer.

    Methods of Checking Battery Condition

    State of Charge Syringe Hydrometer Digital Voltmeter 5-Ball Hydrometer
    100% Charged w/Sulfate Stop 1.280 12.80v 5 Balls Floating
    100% Charged 1.265 12.60v 4 Balls Floating
    75% Charged 1.210 12.40v 3 Balls Floating
    50% Charged 1.160 12.10v 2 Balls Floating
    25% Charged 1.120 11.90v 1 Balls Floating
    0% Charged less than 1.100 less than 11.80v 0 Balls Floating
    A battery’s specific gravity changes with temperature. Ideally, readings should be taken at 77° F. Is it really going to matter if you’re off a couple of degrees one way or another? Probably not. If you’re working somewhere that’s uncomfortably hot or cold, it’s time to use the old conversion factors: add 0.001 to the specific gravity reading for each 3°F above 77°F or subtract 0.001 from the specific gravity reading for each 3°F below 77°F. Cell voltage can be found by adding .84 to the specific gravity.
    Note: Too, that Kiyoshi’s “Sulfate Stop”, a chemical additive that increases battery life by drastically reducing sulfate buildup, changes the specific gravity reading; they’ll be higher than any ordinary batteries.

    Embracing innovation and advanced technology, Kiyoshi offers the best batteries in the market. Performance, reliability, and power are an assurance with us.



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