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Author Topic: Shorai Motorcycle Batteries  (Read 2545 times)

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Offline H₂O

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Shorai Motorcycle Batteries
« on: January 08, 2013, 09:22:54 PM »
http://www.shoraipower.com/Products/batteries/

Anybody ever use these LiFePO4 batteries?

They are drop in replacements for SLA motorcycle batteries and can be charged of most (non-trickle style) SLA chargers - alternatively you can buy their Lithium charge for more functions.

They come in alot of sizes and are very light.

Specs PDF:
https://system.netsuite.com/core/media/media.nl?id=230&c=3379047&h=eded4c1874bc24e92e3f&_xt=.pdf&ck=GLoy6lK-AWIsGrCf&vid=GLoy6lK-AWYsGn5p&cktime=114258&gc=clear

The Wh versus Ah seems off  - i.e. a 21Ah 12V battery is only rated at 93 Wh which to me doesn't match up - typically Wh = Ah x Voltage - so the Wh should be more like 240 not 93
« Last Edit: January 08, 2013, 09:33:10 PM by H₂O »
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Offline H₂O

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Re: Shorai Motorcycle Batteries
« Reply #1 on: January 08, 2013, 09:37:30 PM »
Per there FAQ (Sounds like you need to go off the Wh rating which is much lower then the Ah rating they are advertising - not as good of a deal as I expected):
Q. How does the LFX "PBeq AHr" capacity rating compare to lead-acid Ahr ratings?
A.
First,   we need to understand that the primary job of a starter battery is to   flow a large current (amperage) for a short time, in order to start a   vehicle. In order to do that efficiently, the battery must have low   internal resistance. Holding all other considerations equal, the larger   the battery is in capacity the lower the resistance, and the better able   it is to crank a vehicle under high loads.

Lead-acid makers   have therefore used AHr(capacity) ratings as shorthand to indicate   cranking ability, rather than a real usable capacity. The lead-acid   capacity rating itself is based on a complete discharge at a low   discharge rate. Under actual cranking conditions they will deliver   considerably less than spec capacity. And because lead-acid batteries   begin sulfating when only a small percentage of the capacity has been   used, and their internal resistance rises as they are discharged, the   actual capacity which can be USED may be as little as 20% of the mfg.   rating. Discharge in excess will not only damage the lead-acid battery,   it may not allow proper starting as voltage sags.
Shorai LFX are   based on a completely different chemistry. Not only do they have less   than 1/3 the internal resistance per capacity than do lead-acid, they   are also the ultimate "deep-cycle" battery. The internal "completely   discharged" capacity of a Shorai LFX is 1/3 the rated "PBeq" capacity.   For example, the LFX18 12V series have 6Ah cells internally. But the   cells are capable of 80% discharge without damage and while retaining   more cranking ability. As such, the USABLE capacity(or "reserve   capacity") of an LFX18 12V battery is on or very near par with   18AHr-rated lead acid batteries, while providing superior cranking   performance and a vast reduction in weight. The Shorai PBeq AHr   (lead-acid equivalent) rating system therefore allows users to compare a   very different technology from lead-acid, but on a close   apples-to-apples basis when making a choice.
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Offline H₂O

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Re: Shorai Motorcycle Batteries
« Reply #2 on: January 11, 2013, 01:17:26 PM »
I will say after looking around the interweb over the last few days there is alot of new products out there.

Alot of SLA drop in replacement batteries that are typically about 50% lighter and offer about 30+% capacity increases while able to use the existing SLA chargers

It looks like alot of companies are investing alot into getting LiPoly batteries into vehicles and do it cheaply - which means alot of money is going into the technology and this can only benefit us.
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