i waited waited for some batts from deal extream way back when nobody had them, now there are quite a few...who have them and some that are higher amp ratings, output...( not higer volt but more amps out under load)
anyway, in post #8, having batts for rotation just let me find subpar batts, i mean that out of 16 batts 4 do not have the preformance of the others from new. and i did allow for a limited amout of charge/discharge cycles to get the batts up to speed. so i have dropped the rotation quanty to 6, and for me was easyer to track what batt was reaching the end of life by how many batts i had to charge at the end of the day and which ones was in the recharge line more often, i did for a while carry harbor frieghts 3.00$vdm to check batt AND atty ohms...and the cheep meter i think didnt show ohm diffs to allow me to say the change of atty reistence was wearing batts, i do think that is an issue, but on a bigger batt, not as much as with oem kit batts (901, 801, 510 standard)