A fully charged car battery has 12.6 volts. With my DMM, under load the batteries show around 1.3 volts. I also let the pack rest and recover to 112V or so before I again took it down to 100V (took only a couple minutes, repeated a few times). This sort of thing is a lot more complex than it appears at first glance.When I now discharge, at what voltage should I consider my battery as "empty"? I'd recommend not discharging below 1V though I've gone lower a number of times by accident and there was no permanent damage.Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. Four 1.5V alkaline batteries in series will produce what voltage?...to here to reveal the answers. There is a very big difference when a car battery drops even a small amount of voltage. Alkaline batteries are a common example of __________ batteries, while Lithium-polymer and lead-acid are very common ____________ batteries.With the above information at hand, here's a quick quiz to test your shiny new knowledge: I took the individual 12-cell assys down to 8.5-9V with a 120mm .4A computer fan.You do not want to leave the batteries flat for extended periods of time otherwise a corrosion that insulates the plates starts and reversing the polarity from fast series cell discharges can cause damage.A cut-off voltage of 1.05V/cell is used when discharging at the C/5 rate and 0.9V/cell when discharging at the C rate.For NiMH .. Again, the right answer is to not get yourself into this mess in the first place. please advise to us how we can solve this problem.
Of course this requires measuring individual cells to know when to enable the shunts per cell.For really low current applications you can probably go down to about 0.8, you do have to draw the line somewhere though and I'd suggest not lower than this when using multiple cells in series since the danger exists for some of the cells to be charged in reverse by the others. 12 volts is the standard automotive battery in today’s vehicle and each of the battery has 6 cells with a voltage of 2.1. What is the nominal voltage of 6 AAA batteries connected in parallel?2. With 10 cells, it's hard to pick a reasonable stopping point because possible imbalance between cells could be significant, especially after a few charge/discharge cycles.
Once it does, its internal resistance goes up and further current causes the voltage to drop rapidly, causing permanent damage.My efforts have paid off. I don’t think Loring meant 90%. Say hello to my '06 Honda Civic Hybrid battery pack - 132 D cells in series comprised of eleven 12-cell welded assemblies. While completely accurate when expressing the ideal, there is middle ground. NiMH cells start at about 1.5 V right when fully charged, drop to about 1.2 V most of their discharge life, and are pretty much empty at 900 mV. No cell voltage monitoring capability.Following an 18 hour C/18.5 trickle charge to 186.8V, I took the entire pack down to 100V (.76V/cell) with a 40W bulb during a refurbish effort (Before I got close to 100V, I used a 500W halogen followed by a 100W tungsten). (aa and aaa are 1.5) Fill in the blanks: depending on a battery's chemistry it can be either rechargeable or disposable. Price $25.60. Grainger's got your back. If the battery is fully charged, theoretically how long can it power the 10mA circuit?3. This pack has 132k miles on it and it's lived for 8 years in AZ heat.I have a battery pack of NiMH batteries. A battery's chemistry will also affect the nominal voltage that it will produce. The battery is powering a circuit that consumes on average 10mA. I have a battery pack of NiMH batteries. If someone else did, then they are not trustworthy and it would be a good idea to dump them and find someone that knows what they are doing. This shunts some charge current around the full cells so that they don't get overcharged while the less full cells catch up. Heat management and temperature monitor as well as V "empty" thresholds are the features of intelligent chargers.You will have the same problem with charging. Which voltage is that?In addition lifetime can be reduced faster with temperature rise and thermal sensors to cut-out the charger are the cheap solution to chargers. When a car drops, … Is this the lowest voltage that I can discharge it to without damaging it? If you can measure individual cells, you can go until the lowest cell hits 800 mV, but then stop right away. Packs with this many cells need to have individual cells measured at least, and the best way is to have some charge balancing circuitry. There will always be some imbalance between cells. Fully charged they are about 1.4V. I checked the old ones with my analog battery tester and my DMM. If you designed the battery pack, then you need to fix this. An essentially non-functional battery (for last 1.5 years - provided almost no electric-assist and triggered a battery recalibration every five minutes) has been restored to function properly.