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  1. D

    Powering Micro Sub

    as for the batteries, lifepo4 of a123 or the bmi-cells seems to be the best suiting ones, leaving out exotics and the potentially toxic and permanently heavy ( will you actually need that weight ?) sla´s. as for torpedo drive systems, most probably these are 3 eor more extremerly long and...
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    Tata nano, availability one step closer

    For all of us interrested in building up a NEW electric car in a not to far away future, a car that has some actual passive safety, little but existing comfort, an not fully bussed functionality on the gizmondos and safety features and all of that at a fraction of price of like the "tango"...
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    nicds higher output towards end of life

    this is close to the offspring of the problem ( imo/ guessed), the higher resistance of the cells when drained allows for much amps to come through thus cooling the process down, lowering the resistance and more amps can pass through the cells again. you´ll most probably find that your cells...
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    nicds higher output towards end of life

    maybe the controller of the machine limits it down when voltage drops below a certain level and the batteries are able to recover over that linit while the draw out of them is reduced. basically they are not getting more powerfull, but the weak chemistry can recover to some degree. the feeling...
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    Crypto Battery Authentication

    there was that recent research that people have difficulties to visualize or calculate numbers if these get bigger than 2-3 times of their monthly income. not a joke ( nor ment to be mean or slanderous, i´d just have said "bazillions" ).
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    Crypto Battery Authentication

    batterie choice ( by brands) on laptops is not a good option for the regular customers, most alternatives will be knockoffs and there is hardly a warranty for total compliance; as these batts will be sold by price and not oem quality and the controllers are custom-made for that exact batteries...
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    Crypto Battery Authentication

    the recent asus eee-pc netbook series ( 1008-series) comes with a non-replaceable organic batterie, too. i can well see why manufacturers wouldn´t want to have replacements on these ( if you open the case it should still be doable) batteries in laptops, cellphones and cars. cause if the owner...
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    SLA batteries bloating up - damaged ?

    as i took the bloated cells of the battery case today i used the oppertunity to check all 4 timestamps of each abtterie. 3 where of july 2007, one was of august 2007...the stamp on the controller said september, so it can be safely assumed the manufacturer used non-matching ells that have...
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    Finalizing a123 LiFepo4 pack configuration, advise ?

    As for the ESR onboard charger, the draw at the wall plug is at 72 watts stable, considering a maximum efficiency grade of approx. 85% , 30 volts per bank seems just right. the dewalt/ 26550 a123 cells do have the same 4.2 volts critical limit, so the onboard charger seems to be just right and...
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    Electric cars, why 48-144V? Why not >400V?

    The "Twike" is running on 366 volts and is street homologated in europe and sold worldwide since the mid-90ies. gets 55 mph topspeed and 80 miles range, stuff is pricey, though. but it´s the only vehicle actually legal to drive with most controlls in a joystick ( including steering and...
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    Finalizing a123 LiFepo4 pack configuration, advise ?

    thanks, i was figuring out it should be 8 cells but another gpn member allready used exact these cells in a 2008 thread and he was running them 7s7p ( yes, 7 parralel) and mr patmont stated that the charger with batteries unplugged should put out 24 volts at each lead. i was mistakening the...
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    SLA batteries bloating up - damaged ?

    as each batterie will see up to 30 amps peak draws in "turbo" mode ( vs the 2econo"-mode) the cheaper packs will be smacked by peukert full force and be deplated and hot in like 2-3 minutes. i got the oppertunity to make a "depletion run" this morning ( i factually got up 30 minutes earlier...
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    Finalizing a123 LiFepo4 pack configuration, advise ?

    i essentielly still need to know whether i should better strap up 7 or 8 cells in series in order to get the best charging state out of them. as for paralleling, i am also yet undecided if i should strap 2 or even 3 of them in parralel on each 24 volt bank or if 1 or even 2 of them per bank ( 2...
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    Finalizing a123 LiFepo4 pack configuration, advise ?

    As my SLA´s ae bloated i am going ahead with converting my Goped ESR750 EX from BB´s hr12-12 to Lifepo4. In order to keep on using the stock onboard charger which is seemingly capable to charge LiFePo and even Lipo ( except balancing) in needed modes according the manufacturer i want to make...
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    SLA batteries bloating up - damaged ?

    i was hearing short and periodic "stem release" noises the charging cycle in before the swelling occured when walking by while charging. obviously the out-gassing is a sign of the cells being charged too fast and breathing out their life, in after they bloat up somehow. i hope to find time to...
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    SLA batteries bloating up - damaged ?

    this is the cells: Funny how the "still good" cells go up to a similar temperature if charged without the bad packs, if all are charged together the bad ones heat up while the good ones stay cool and seemingly not charged (?), i´ll need to get measuring equipment for that at home.
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    SLA batteries bloating up - damaged ?

    Hi scoot, the BMi´s are appealing to me, too, but i figured the space it requires tomount them and the fact they all have to be mounted without actual contact and will want a balancer 8 so the packs will not utilituze the available space as good as lifep´s of 123 in cylinder form made me to...
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    SLA batteries bloating up - damaged ?

    the other diameter and top/ bottom seems to have expanded in a fashion that they won´t go back to regular shape ( or even close to) as it seems. on the now running charge the batteries remain at slightly increased room temperature, i´ll see how that ends up as i will run this batteries again...
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    SLA batteries bloating up - damaged ?

    it´s the onboard charger of which i can´t find details specs ( ESR750ex goped), but i believe i read it used 3 steps charging 1c, 2c and 3c ( could also be 1,5 10 ?) only, the heating effect does not quite reflect that. the charger was originally constructed to run on 110 volts 8 up to...
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    SLA batteries bloating up - damaged ?

    two of the 4 batts are shaped in a fashion i am allready sure they will need replacement ( the deck doesn´t fit back on), the other 2 on charge went over 55 degreees celsius and started to bloat in after only 2 hrs of separate charge ( from cold to builing hot in 2 hrs). Is this a sign of old...
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    SLA batteries bloating up - damaged ?

    it evolved from one batterie + one pack of the second batterie and now both packs are balooning, i disconnected these and only charge the other both which now start to get warm ( but not hot). i blame a deep discharge state when receiving them shipped+ positioning hindering the valves for that...
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    SLA batteries bloating up - damaged ?

    So i checked my 4 sla batteries ( bb hr9-12) and found one bank of two is much hotter than the other one and the cells within the case are bloated up like the shirt of "hulk" in the process of turning green.. . I swapped them over with the same set on the other side but still these both get way...
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    Lithium Batteries Shipping Rules Discussions

    Try and get Patmont Motor Werks involved, they allready sued and lost against the state of commifornia for pollution issues and legal state of 2-strokers on street usage and sued and won in order to get close to 200% tax on chinese collapsible motor scooter imports; as the company sees the...
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    German town goes car-free

    the part with paying 1000$ for having some tracking systems removed while a simple gps-blocker or removal of the i/o port to the sky-"hook" would have served the purpose just as well- I get the scheme, the german highways got equipped with optical readout equipment to check if all vehicles have...
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    German town goes car-free

    7$+ per gallon as for fuel and close to 30 cent per kw/h here in germany...
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