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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Battery weak after ride - C Rapide
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<blockquote data-quote="Monkeypants" data-source="post: 47114" data-attributes="member: 2708"><p>I 've got an Alton, it appears to be working just fine. I have used lead acid batteries with it in the past, no problem there, even the cheapies last four of five years.</p><p>The problem isn't the charging system, it is that Lithium Ion batteries are not compatable with our systems, the "Walkernator" may be an exception.</p><p>The first problem with Li batteries is their rating system, Pb/eq, or lead acid equivalent. The sales departments quote these numbers as though they are comparable to AH ratings in lead acid batteries. They aren't even close. To get an approximate AH rating from a LI battey's Pb/eq rating, divide by 3. So that is the first problem, a Li battery with a Pb/eq rating of 9 was sold to me to replace a lead acid 9ah. The actual storage capacity of the 9pb/eq Li battery is 3ah, much too small for the job. Couple this with the fact that the 3 ah is only available in a system that is maintained at about 14 volts, and you have a real problem. At 13 volts you only have 1 ah of power remaining. This means that the battery will go dead very quickly when idling in traffic with the headlight on (discharge). </p><p>Once the voltage in the Li battery drops below 12.5, the battery goes into limp mode to protect itself , so voltage drop off a cliff. When discharging, voltage goes directly from 12.5 volts to around 5 volts. If you have point coil or EI ignition this means that the engine will die and you are up a creek. This is just how these batteries work , and it took me awhile to realize it.</p><p>I have talked with people who have used them with older systems and had a satisfactory result. Generally these are bikes that do not rely on the battery for ignition. If that is the case, you can get by with nearly anything.</p><p></p><p>Glen</p></blockquote><p></p>
[QUOTE="Monkeypants, post: 47114, member: 2708"] I 've got an Alton, it appears to be working just fine. I have used lead acid batteries with it in the past, no problem there, even the cheapies last four of five years. The problem isn't the charging system, it is that Lithium Ion batteries are not compatable with our systems, the "Walkernator" may be an exception. The first problem with Li batteries is their rating system, Pb/eq, or lead acid equivalent. The sales departments quote these numbers as though they are comparable to AH ratings in lead acid batteries. They aren't even close. To get an approximate AH rating from a LI battey's Pb/eq rating, divide by 3. So that is the first problem, a Li battery with a Pb/eq rating of 9 was sold to me to replace a lead acid 9ah. The actual storage capacity of the 9pb/eq Li battery is 3ah, much too small for the job. Couple this with the fact that the 3 ah is only available in a system that is maintained at about 14 volts, and you have a real problem. At 13 volts you only have 1 ah of power remaining. This means that the battery will go dead very quickly when idling in traffic with the headlight on (discharge). Once the voltage in the Li battery drops below 12.5, the battery goes into limp mode to protect itself , so voltage drop off a cliff. When discharging, voltage goes directly from 12.5 volts to around 5 volts. If you have point coil or EI ignition this means that the engine will die and you are up a creek. This is just how these batteries work , and it took me awhile to realize it. I have talked with people who have used them with older systems and had a satisfactory result. Generally these are bikes that do not rely on the battery for ignition. If that is the case, you can get by with nearly anything. Glen [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Battery weak after ride - C Rapide
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