Could you give those details here?
Speedcell 7.5Ah (formerly 6.9Ah)= 985 grams or 2lbs 3 oz
Lithium, like lead acid, has performance degradation at low temperatures. The ability of lithium to flow electrons (what is actually doing the work) at low temps is severely reduced. Lead acid also suffers from cold weather performance degradation-- that is why the sleds are fitted with 20 Ah batteries.
Lithium does have quick recovery rates-- one of the reasons I used to recommend "bumping" the starter switch a few times to "pre-heat" (electrically not physically) the battery to essentially wake up the battery so it could deliver the required amps at start up. I DO NOT RECOMMEND THIS METHOD ANYMORE. The mode of failure when there are insufficient amps to power the starter is when the Bendix fails to throw the pinion gear all the way out to engage the gear behind the clutch. This results in premature failure of the pinion gear. There are two methods for cold morning starts.
1.) tried and true pulling of the cord.
2.) we can build your subharness with a flying lead that terminates in an Anderson dual pole connector. We can supply you with a small dual pole Anderson connector that you attach to a jumper (lead acid) battery for your first start of the day.
Another thing to be aware of with lithium batteries is not to allow them to over discharge. If you drain a lithium battery below 10.5 volts static (you left your GPS on or afr gauges, etc) and draw the battery below 10.5 volts-- you now have an expensive paperweight.
The three advantages of lead acid over lithium are
1. cost
2. cold weather performance (at the expense of weight)
3. ability to withstand over discharge (but this will also lead to accelerated failure in lead acid)
Lithium main advantages
1. Significantly smaller size (especially important in turbo applications)
2. Significantly lighter ( typically in excess of ten pounds-- short of having a pull start only sled, where else can you shave off ten pounds for less than $400?)
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