Technical Information Maintenance Free Battery

A maintenance free battery is installed in this model. The maintenance free battery is a sealed type, and so cannot be pyfymyl jh? ylgflrQlyw level check and topping-up.

(I) Construction

Filter Safety valve plug

Filler plug

Positive plate

(lead and lead-calcium alloy)

Filter Safety valve plug

(lead-calcium alloy)

Filler plug


(lead-calcium alloy) Negative plate (lead and lead-calcium alloy) Special separator

Positive plate

(lead and lead-calcium alloy)

(II) Main Features

1) Maintenance free It is not necessary to check the electrolyte level and top-up the electrolyte.

2) No electrolyte leakage As the electrolyte is retained firmly in the special separators, there is no free electrolyte in the battery.

3) Instant activation system It can be used instantly after filling only the electrolyte without initial charge.

4) One-push motion electrolyte filling It is possible to fill the electrolyte by easy one-push motion.

5) Safety construction If the battery internal pressure rises abnormally high, the safety valve opens to release the gas inside the battery to restore the normal pressure and prevent the battery from rupturing. After restoring the normal pressure, the safety valve closes and the battery is sealed again. Moreover, a ceramic filter is disposed on top of the safety valve under the lid to remove risk of ignition or explosion caused by fire from outside.

6) Compact and high performance No presence of free electrolyte allows the battery made lower in height, thus resulting in enhanced volume efficiency. Moreover, gas being absorbed inside the battery eliminates the need for a gas exhaust tube.

7) Strong charge/discharge characteristics It can amply withstand deep charge/discharge cycles.

(III) Principle of Sealing Structure

A lead-acid battery operates under the following chemical reaction:

(Lead peroxide) (Sulfuric acid) (Spongy lead) Charge (Lead sulfate) (water) (Lead sulfate)

Positive active Electrolyte Negative active Positive active Electrolyte Negative active material material material material

Normally in an ordinary lead-acid battery when it comes to an end of a charge, where the lead sulfate being a discharge product returns to lead peroxide and spongy lead, the charge current flowing thereafter is used exclusively to decompose electrolytically water from the electrolyte, thus resulting in generation of hydrogen gas from the negative plate and oxygen gas from the positive plate. The gases so generated are released out of the battery, causing the amount of electrolyte decreased to require occasional water replenishment.

A maintenance free battery, however, is so designed that, when it is overcharged, even if the positive plate is fully charged, the negative plate remains not fully turned to spongy lead. Therefore, even when the positive plate is overcharged generating oxygen gas, the negative plate is no fully charged, hence generating no hydrogen gas.

Moreover, the oxygen gas generated from the positive plate immediately reacts with the charged active material on the negative plate, and returns to water, with the ultimate result of no water loss.

Negative active material (charged state)

► 1/2 02 Oxygen generated from positive plate

H2SO4 Electrolyte

(PbO) Negative active material

PbSO* + Negative active material (charged state)

H2O Water

Thus, the negative plate is made as not to get fully charged. Even if the overcharge continues, the oxygen gas generated inside the battery is absorbed by the negative plate, a process called oxygen cycle, which keeps water loss theoretically at nil, and allows the battery to be sealed.

(IV) Filling the Battery with Electrolyte

Do not remove th« aluminum seal sheet sealing the filler ports until just before use.

Be sure to use the dedicated electrolyte container for correct electrolyte volume.

•Check to see that there is no peeling, tears or holes in the sealing sheet.

• Place the battery on a level surface.

OWhen removing, check to hear an air-sucking sound "Shooshl" from filler ports [B].

DIY Battery Repair

DIY Battery Repair

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