Hi Matt, I don't believe Lowell is on this list, or at least I've never seen him post here. But yes, this is essentially the same battery that Lowell recently used, made by the same manufacturer, Hawker, although marketed under a different brand name -- Odyssey in the case of those batteries Lowell recently used and EnerSys for those about which I am seeking confirmation (or more likely, debunking) of the company's exaggerated claims.
The Odyssey PC2150 is comparable to the EnerSys 95. The Odyssey PC2150 has a capacity of 100Ah @ C/20 and 73Ah @ C/1. The EnerSys 95 has a capacity of 95Ah @ C/20 and the company *claims* that the C/1 capacity is 80Ah, which seems quite dubious, just based on comparison with the PC2150. Furthermore, if you discharge an Odyssey PC2150 to 80% DOD every single cycle, my understanding from those who have used this battery is that you will murder it within 6 to 12 months. But the company *claims* that you can deep discharge the EnerSys 95 to 80% DOD every single cycle and it will still deliver greater than 80% of original capacity for more than 5 years and 1250 cycles. This is quite ludicrous and just doesn't even pass the laugh test. There are a few EVers who have used the EnerSys battery, but they are not willing to vouch for the company's outlandish claims. This is as I suspected. If something seems too good to be true, it probably is. This sort of hype and hyperbole from battery manufacturers is, unfortunately, all too common and something that we have seen for many years, which of course gave rise to the famous old saying about "liars, damn liars, and battery salesmen". Oh well ... caveat emptor is the watchword and rule here. Charles ----- Original Message ----- From: "Matt Graham" <[EMAIL PROTECTED]> To: "'Charles Whalen'" <[EMAIL PROTECTED]>; "'FLEAA Mailing List'" <[email protected]> Sent: Friday, August 31, 2007 9:08 AM Subject: RE: [FLEAA] C/1 capacity of EnerSys 95? Charles, I think that's essentially the same battery that Lowell recently used. At least the size, capacity and appearance look the same. It may have been marketed under a different name, or have some internal difference from the exact model he used. I would check with him, although you will probably need to wait until later in the day, since he's teaching again. Matt -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Charles Whalen Sent: Thursday, August 30, 2007 10:17 PM To: EV Discussion List Cc: EVs for Sale DL; Florida EAA; RAV4-EV list Subject: [FLEAA] C/1 capacity of EnerSys 95? Does anyone know what the real-world C/1 capacity of the EnerSys 95 battery is? There are no specs for this battery on the company's website, and in fact no listing and no mention of this battery at all, at least not that I could find. Company officials claim 80Ah @ C/1, but that sounds rather optimistic to me from 95Ah @ C/20. I would think 70Ah @ C/1 would seem more realistic. I need a reality check from the marketing hype here. Anyone know from experience with this particular battery what the real 1-hour discharge capacity is? Something else for which I need a reality check is company officials' claim that as long as a pack of EnerSys 95's is used with a central balancing BMS, it can be deep cycled to 80% DOD ***every single cycle*** and still deliver greater than 80% of original capacity for more than 5 years and 1250 cycles. I need a little help here. All of my experience is with advanced chemistry batteries, none with PbA. But my understanding from what I've always read and been told about AGMs is that they shouldn't generally be cycled deeper than 50% DOD very often and that if you regularly cycle them to 80% DOD, you will murder them within 6 to 12 months. So this claim by EnerSys of a 5-year/1250-cycle life @ 80% DOD, to 80% of original capacity -- is this also just more hype and hyperbole, or am I missing something here? Again, anyone know from experience with this particular battery? Thanks, Charles Whalen _______________________________________________ Florida EAA mailing list [email protected] http://www.floridaeaa.org _______________________________________________ Florida EAA mailing list [email protected] http://www.floridaeaa.org
