As Odyssey's technical sales manager John has over 25 years experience working with batteries and the technology involved in making them more efficient and reliable (www.odysseybatteries online.co.uk).
WHAT CAUSES SELF-DISCHARGE?
Conventional batteries, even with AGM, will sef-discharge in weeks because of the alloy/lead plate mix. Most manufacturers add an clloy [either calcium or antimony] to the lead to provide mechanical strength to the battery grid [antimony, used in wet cells] or slow down self-discharge/prevent gassing [calciun, used in gel/AGM]. The big problem with these alloys is that they're impurities and so the chemical reaction isn't as good [therefore less electrical charge] as if just pure lead was used. Other drawbacks include increased discharge from antimony [these batteries need to be used often or trickle charged], or buckling/rupture of the battery container caused by calcium/lead plates 'growing' because of oxidation due to long-term overcharging.
WHAT IS SULPHATION?
When a lead acid battery is left discharged, the lead from the plates combines with the electrolyte to make lead sulphate. Some of this will crystalise onto the plates, which then acts as an insulator or barrier, reducing the plate area in contact with the electrolyte and preventing the battery from operating normally.
The deeper the battery is discharged, the more the lead sulphate is likely to crystalise. Over time this lead sulphate crystal build-up will ma<e the battery fail. Sulphation can be easily identified as the white substance that builds up on batteries. O
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You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.