Recent content by evalon

Hi .. Hillhater & Peter.bp, Sorry, my mistake in wording my question correctly. What I need is a battery which at a reasonable charge (50 - 100%) that has a voltage around 4 - 4.1 VDC so a Li-ion battery may well be what I am looking for. And as I wrote I've already gotten a fine help with the...

Hi redilast, Thanks for your feedback. Actually, my reason for being interested in 26650 batteries is their potentially lower internal impedance. I've been searching some for 18650 cells with low internal impedance, however, have not really found any - most of them had impedances in the 40 - 60...

Hi All, I have a question that I hope I can get help with here in this forum ... As it is I'm looking for a very low-impedance Li-ion (or other chemistry with a 50% charged voltage of appr. 4 - 4.1 VDC) battery in the size 26650. I've been considering e.g. the Panasonic CGR 26650B (<= 14 mohms...

@ r3volved: Thanks for the tip ... Then I reckon that if I search these threads I might find some tips for vendors as well :wink: @999zip999: Hi ... I searched for it in the forum and found this thread: http://endless-sphere.com/forums/viewtopic.php?f=14&t=48074 However, if these are the...

Hi again, Hmmm... I can see that many look at this post, but no replies ... ? I wonder if it could be the environmental aspect that is the reason for no replies ... So, please, if you have a suggestion for a suitable vendor please make the suggestion and then I'll do the environmental...

Hi All, I'm looking for an advice on a vendor for good quality LiFePO4 batteries at reasonable prices. I don't need that many (~18-30, 2.3-3.3 Ah size) but they should be good quality (low ESR, long life), reliable, and the manufacturing company should have a good environmental profile as...

Hey :) I'm in the process of evaluating LiFePO4 batteries and would like to consider the enviroment ... To that end: any of you know which maybe 2-3 manufacturers are considered the most environmentally conscious? Thanks for reading and maybe replying :wink: Jesper

Hey again, I've now gotten a reply from battery university and apparently there's not much information about float (trickle) charging LiFePO4 batteries. However, it's an interest of the person I communicated with as well so if he finds more information he'll get back to me. As for now he would...

Hi, There's also this IC from Linear technology - protects against overvoltage and appears to have undervoltage indication. Has a quite low quiescent current as well. But requires PCB layout ... http://www.linear.com/product/LTC4365 Best regards, Jesper

Hi all, & thanks for your replies. Very informative to learn about your experiences and thoughts :) Hmmm... In this context I do, however, need to be quite sure that the batteries are not damaged by float charging (need the low ESR for a long time) so I have decided to send a mail to Cadex...

Hi All, I'm considering float charging a series of 6 LiFePO4 batteries (3.45 VDC/cell with balancing, vs 3.6 VDC full charge voltage) on a continuous basis, i.e. for about 10 days per period. Then the batteries will be disconnected from the charger, somewhat discharged and then again charged at...