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  • Hefra
    VMF SLA VRLA VMF Gel Deep Cycle VMF AGM Standard VMF AGM Deep Cycle VMF AGM EV Series VARTA AUTOMOTIVE VARTA Silver Dynamic AGM VARTA Blue Dynamic EFB VARTA Silver Dynamic VARTA Blue Dynamic VARTA Black Dynamic VARTA Pro Motive EFB VARTA Pro Motive Silver VARTA Pro Motive Blue VARTA Pro Motive Black VARTA PROFESSIONAL VARTA Professional Starter VARTA Prof Dual Purpose VARTA Prof AGM Dual Purpose VARTA Prof Deep Cycle VARTA FUNSTART VARTA Funstart Gel VARTA Funstart AGM VARTA Funstart Freshpack OPTIMA OPTIMA Red Top OPTIMA Yellow Top OPTIMA Blue Top DEKA SPORTSPOWER DEKA Sports Power AGM LITHIUM REBELCELL Lithium DC SKYRICH Lithium M C ODYSSEY ODYSSEY TROJAN TROJAN Deep Cycle 6 8V TROJAN Deep Cycle 12V TROJAN Deep Cycle AGM TROJAN HYDROLINK CELLPOWER CELLPOWER CP Series CELLPOWER CPL Series CELLPOWER CPH Series CELLPOWER CPW Series CELLPOWER CPC Series CELLPOWER CPX Series CELLPOWER CPT Series MARINE BATTERIES FURUKAWA SS ALDIS TUBULAR Tubular 6V 12V Traction Cells PzS DIN Traction Cells PzB BS Traction Cells PZV DIN CHARGERS GENIUS CHARGERS GENIUS ACCESSORIES POWERLINE CHARGERS LITHIUM CHARGERS ZENITH CHARGERS BOOSTERS GENIUS BOOSTERS TESTERS START STOP VALIDATION MIDTRONICS DHC HYDROMETER BATTERY BOX NOCO Battery Containers HDPE Battery Containers SOLAS Battery boxes ACCESSORIES

    Original URL path: http://www.hefra.nl/docs/webshop.asp?act=newsletter (2016-05-01)
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  • Hefra
    s largest independent importer of secondary batteries Home Technical info About Batteries About Chargers Testing Legal Downloads Recycling Consumer Contact us Nederlands English Francais You are here Home Copyright 2016

    Original URL path: http://www.hefra.nl/docs/webshop.asp?act=doc&id=192024 (2016-05-01)
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  • Hefra - Technical info - Accu levert geen startstroom
    loss of active mass These processes are taking place gradually never suddenly Unfortunately that is not to say that the symptoms are not from one day to the next a good night frost can make painfully clear what at higher temperatures remained unnoticed If the problem does occur prematurely is has most likely been caused by overcharging and or excessive temperature in which case it is important to check the alternator to stop it from happening again A second cause can be found in loss of active mass by deep discharge No surprise if the battery has insufficient capacity to meet the energy requirements of the vehicle The same applies of course for starter batteries that do not receive sufficient charge Short trips during which the dynamo cannot fully charge the battery will eventually bring the battery in a permanent state of deep discharge which severely cuts battery life Another cause of battery failure is often overlooked acid stratification The electrolyte on a stratified battery concentrates on the bottom causing the upper half of the cell to be deprived of it The upper half of the cell is deprived of acid which will limit plate activity promote corrosion and reduce

    Original URL path: http://www.hefra.nl/docs/webshop.asp?act=doc&id=4774 (2016-05-01)
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  • Hefra - Technical information - battery does not hold charge for long
    deep cycle batteries largely depends on the depth of discharge In fact the service life of a deep cycle battery is often determined at the moment of purchase when it is dimensioned It is at that point when making the calculation of power consumption and charging facilities that the number of cycles to expect are decided upon Deep discharge due to lack of capacity of the battery charger or alternator

    Original URL path: http://www.hefra.nl/docs/webshop.asp?act=doc&id=4776 (2016-05-01)
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  • Hefra - Technical info - Bulging
    Runaway Bulging Why do some VRLA batteries bulge Why do some VRLA batteries appear sucked in To prevent the permanent loss of gases so that recombination has time to take place each cell can hold approx 1 6 pounds per square inch psi of pressure without venting Batteries with very large cells such as the BCI 4D BCI8D DIN250 JIS150 JIS200 GC electric vehicle and scrubber types will bulge somewhat as this normal pressure builds This is especially true in higher temperatures because the polypropylene case is pliable Therefore a certain amount of bulge is normal If a battery bulges severely on charge this is not normal It is an indication of a blocked valve or an overcharge situation If the charger works properly such a battery should be removed from service A sucked in appearance can also be normal A partial vacuum can form within a sealed battery under various circumstances Battery temperature and ambient pressure play a role but predominantly the recombination and discharge reactions are responsible After charging ends the recombination reaction continues until most of the oxygen in the battery is consumed The total volume within the battery decreases slightly during a discharge Deeply discharged batteries

    Original URL path: http://www.hefra.nl/docs/webshop.asp?act=doc&id=4839 (2016-05-01)
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  • Hefra - Technical info - Accu laadt niet op
    a battery in spite of a properly functioning and connected charger does not charge the battery is has most likely fallen victim to sulfation Sulphatation results from two factors state of charge and the time the battery discharged Sulphatation not only hampers the charging process but it can also form large crystals which bridge between two plates and cause a short circuit In the event of such a short circuit

    Original URL path: http://www.hefra.nl/docs/webshop.asp?act=doc&id=4778 (2016-05-01)
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  • Hefra - Technical info - Accu lekt zuur
    very corrosive and can cause serious damage damage to its surroundings Flooded batteries should always be kept in an upright position to prevent acid leaking through the filling ports or in the case of a closed battery through the vent VRLA batteries do not contain free acid so they can easily be installed in a tilted position If a battery is leaking along the lid without signs of external damage

    Original URL path: http://www.hefra.nl/docs/webshop.asp?act=doc&id=4780 (2016-05-01)
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  • Hefra - Technical info - Low temperature operation
    the specific gravity dropped to 1 140 Electrolyte of this S G would freeze at around 15 C giving a margin of 15 C between the electrolyte temperature and its freezing point Similarly at an electrolyte temperature of 20 C a battery would give only 50 of its rated capacity and have a fully discharged S G of about 1 180 At this level of S G freezing occurs at

    Original URL path: http://www.hefra.nl/docs/webshop.asp?act=doc&id=4846 (2016-05-01)
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