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So the last battery I bought started my truck even though it was flat?
Don't understand the above comment!
Below may enlighten.
The self-discharge rate is a measure of how much batteries discharge on their own. The Self-Discharge rate is governed by the construction of the battery and the metallurgy of the lead used inside.
For instance, flooded cells typically use lead alloyed with Antimony to increase their mechanical strength. However, the Antimony also increases the self-discharge rate to 8-40% per month. This is why flooded lead-acid batteries should be in use often or left on a trickle-charger.
The lead found in Gel and AGM batteries does not require a lot of mechanical strength since it is immobilized by the gel or fiberglass. Thus, it is typically alloyed with Calcium to reduce Gassing and Self-Discharge. The self-discharge of Gel and AGM batteries is only 2-10% per month and thus these batteries need less maintenance to keep them happy.
Ni/Cd and Ni/MH cells suffer self-discharge rates as high as 25% per month. This presents the user with a major logistical problem since charging is normally always required before Ni/Cd batteries are used in the field.
Lead-acid and nickel-cadmium batteries lose their charge very quickly. For example, a lead-acid battery stored at 30oC would lose half its initial charge in about 3 or 4 months while, for nickel-cadmium, this would only take about 6 weeks. In normal use, this might present no real problem, as these types of battery can be recharged, but such batteries are clearly unsuitable for "fitting and forgetting".
Alkaline batteries hold their charge better than zinc-carbon, but lithium primary batteries have particularly good storage characteristics, due to the passivation layer that forms on the anode surface at open circuit. In most cases it is best to store batteries in a cool place and to warm them before use.
Saxo1
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Topic: EHU
