I have 8 EVE 304ah cells that I am in the process of pre-charging prior to top balance with a bench supply @ 3.6V, hovering around 7A with 14ga wire/ring terminals. I've tried to read all I can about this process. I understand it is going to take a while. I have perused the up in smoke section to rile up a healthy amount of anxiety to hopefully avoid any blue smoke.
Individual cells all arrived at 3.301 V +/- 0.005 V with a cheaper model Fluke multimeter.
I've been charging 4P @ 3.6V. I'm probably close to 35 hours in and voltage is around 3.39 after they have rested overnight.
I've only been doing this during the day when I'm within sight or earshot of the cells. At this rate, it's going to be weeks to get both 4P sets tanked up before I can place in series. My question is, if my bench charger is set to a lower rate, say 3.55V, is there any risk of overcharging? In other words, the cells cannot go beyond the set voltage on the bench supply correct? I have confirmed voltage is accurate with my fluke and cells seem to be of very narrow voltage so I don't think I would see voltage creeping over from the other cells when wired parallel. I want to leave these on the bench supply 24/7 rather than 8 or so hours per day. If I do this, I'd probably move them to the overhang beside the barn as an extra precaution just in case there is a bad cell.
Once the 3.55V is achieved, I should bump the voltage to 3.65V until the current drops to naught?
Individual cells all arrived at 3.301 V +/- 0.005 V with a cheaper model Fluke multimeter.
I've been charging 4P @ 3.6V. I'm probably close to 35 hours in and voltage is around 3.39 after they have rested overnight.
I've only been doing this during the day when I'm within sight or earshot of the cells. At this rate, it's going to be weeks to get both 4P sets tanked up before I can place in series. My question is, if my bench charger is set to a lower rate, say 3.55V, is there any risk of overcharging? In other words, the cells cannot go beyond the set voltage on the bench supply correct? I have confirmed voltage is accurate with my fluke and cells seem to be of very narrow voltage so I don't think I would see voltage creeping over from the other cells when wired parallel. I want to leave these on the bench supply 24/7 rather than 8 or so hours per day. If I do this, I'd probably move them to the overhang beside the barn as an extra precaution just in case there is a bad cell.
Once the 3.55V is achieved, I should bump the voltage to 3.65V until the current drops to naught?