Ui Sent from my Verizon Wireless BlackBerry -----Original Message----- From: lyle sloan <[EMAIL PROTECTED]>
Date: Sat, 22 Mar 2008 04:49:11 To:ElectricMotorcycles <[email protected]> Subject: Re: [ElectricMotorcycles] Fast charging---dumb idea? Sorry I dont have a clear cut answer, but here is my view on charging and batts and maybe it will help: All batteries are just trying to contain a chemical reaction inwhich both sides, the anode and the cathode, want to reach neutral. This chemical reaction is controlled by the rate of electrical discharge and the batteries' internal resistance. When we charge, we are using electrolysis to reverse the neutral state which is why the charge voltage must be higher than the original 12V. With electrolysis there will be loss of material because not everything transfers back over to exactly as it was before discharge. Some of the material will remain on the one side unable to transfer back over due to higher resistance, or lost during gassing. In addition, any material that transfers back to the original side will layer ontop of the highest conductive point. This means the original structure of the anode or cathode has become pitted or brittle, as well as brittle from heat. This brittleness can also be seen when fast charging (hi amps) because only the most conductive and highest point are going to get the material. If charging slowly (low amps), more material is able to transfer back to the other side evenly, filling all the gaps or holes. The life of the batteries is dependant on how well the structure of the anode and the cathode (both chemically and physically) remain as close to original as possible. High discharge and fast charging dont help in this respect. Moderate discharge and slow charging will preserve batteries. But the reality is, who wants to drive slow or wait forever on a slow chrage? That's why when charging, a combination of the two (fast and slow) is used which affects the life of the battery. So it will be up to each guy to figure out how long to charge for fast and then slow for the type of batteries he is using Which means battery life will vary from person to person. --- Andrew Wowk wrote: > Does anyone know exactly how battery life may be > shorted with fast charging, > provided the charge voltage is tempreature > compensated? My B&B batteries > have a max charging rate spec of .3CA whichseems to > be pretty universal for > most Chinese AGMs. I would like to charge them > faster on an as-needed bases, > but I'm wondering if this is a bad idea. It seems > like I could charge faster > in the bulk phase without too much damage to them. > ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
