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In the final stage of charging, an oxygen-generating reaction occurs at the positive plates. This oxygen transfers inside the battery, then is absorbed into the

surface of the negative plates and consumed. These electrochemical reaction processes are expressed as follows.

(Positive electrode)

P b S O 4





(Lead sulfate)

(Lead dioxide)


(Negative electrode)

P b S O 4


P b ( O2 )

(Lead sulfate) (Lead) Reaction Gas recombination reaction cycle


  • Stand-by/Back-up power applications

    • Communication equipment: base station, PBX, CATV, WLL, ONU, STB, etc.

    • Back-up for power failure: UPS, ECR, computer system back-up, sequencers, etc.

    • Emergency equipment: lights, fire and burglar alarms, radios, fire shutters, stop-position controls (for machines and elevators), etc.

  • Main power applications

    • Communication and telephone equipment: cellular phones (bag phones), transceivers, etc.

    • Electrically operated vehicles: picking carts, automated transports, electric wheelchairs, cleaning robots, electric automobiles, etc.


  • Tools and engine starters: grass shears, hedge trimmers, cordless drills, screwdrivers, jet-skis, electric saws, etc.

  • Industrial equipment/instruments and non life- critical medical equipment*: measuring equipment, non life-critical medical equipment (electrocardio-graph), etc.

  • Photography: camera strobes, VTR/VCR, movie lights, etc.

  • Toys and hobby: radio-controllers, motor drives, lights, etc.

  • Miscellaneous uses: integrated VTR/VCR, tape recorders, other portable equipment, etc.

*(Note) When any medical equipment incorporating a Panasonic SLA battery is planned, please contact Panasonic.

  • Leak-resistant structure

A required-minimum quantity of electrolyte is impregnated into, and retained by, the positive and negative plates and the separators; therefore electrolyte does not flow freely. Also, the terminal has a sealed structure secured by long adhesive-embedded paths and by the adoption of strong epoxy adhesives which makes the battery leak-resistant. (Note) In stand-by/back-up uses, if the battery continues to be used beyond the point where discharge duration has decreased to 50% of the initial (i.e. life judgment criteria), cracking of the battery case may occur, resulting in leakage of the electrolyte.

  • Long service life

Service life of our long-life series (LC-P, LC-X series and LC-TA122PU, LC-T122PU batteries is approximately double that of the conventional (LC-R and LC-L series) batteries (Temperature 25C), discharge rate 0.25 CA/ 1.75V/cell, discharge frequency every 6 months, 2.30V/cell charge).

  • Easy maintenance

Unlike the conventional batteries in which electrolyte can flow freely, SLA batteries do not need the specific- gravity check of the electrolyte nor the watering structurally; this makes the battery function fully and makes maintenance easy.

  • No sulfuric acid mist or gases

Unlike the conventional batteries in which electrolyte can flow freely, SLA batteries generate no sulfuric acid mist or gases under the use condition we recommend. In uses under conditions other than recommended, however, gas generation may occur, therefore do not design the battery housing with a closed structure.

  • Exceptional deep discharge recovery

As seen in the figure on the next page, our SLA battery shows exceptional rechargeablity even after deep discharge, which is often caused by failure to turn off the equipment switch, followed by standing (approx. 1 month at room temperature is assumed).

Sealed Lead-Acid Handbook, Page 14

January 2000

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