I have a 4.8V 2000MAh powering the radio in my RC boat. to prevent from deep over charged. There are some made for Razor scooters but I having researched that line find they are designed for lead acid batteries. First let us check weather the battery has any juice left in them after … Any way, my rig is still undergoing continuous test for future determination and to keep an eye on how many cycles I can get out of them of part charging and full discharging on a daily bases as well as on a stand by bases. They seem to be more suited to this type of protection scheme. Model chfcv2e? dt/dv works in most cases. Asser, The round one rotates back and forth as all those type do, and the square one moves sideways back and forth. What would be your opinion in the case? Dear Peter, I advise you tell me the brand of the Xootr powered scooter, or more detail information about the scooter…the charger and the battery have very complicated relationship. By submitting this form, you are providing your express consent to receive electronic communications from Battery University and the Battery University Science and Technology email newsletter, powered by ArcaMax.         i am trying to charge 12v 800mAH(1.2v*10cells AA) NimH battery. As i see it right now im on a win win situation. NiMH     The batteries are sanyo xxx 2700mAH and according to the charger manual, it took 12h to charge 2700mAh. Without rereading all the great doc assembled on this site (I haven’t worked on charges for a while), I would stick with .5C and monitor temperature which has the advantages of charging to the peak capacity while being one of the safest methods of detecting a runaway charger. Maurie,  You should use the supplied charger which is a slow charger I believe not unlike those for my HT’s. for many years now I have used an electric toothbrush, three times a day. Many intelligent chargers for NiCds sense a small but distinct \"bump\" in the output voltage when a NiCad is fully charged. > How can you accept the cells showing 0.4V-0.5V? Period. The gun fired rapidly at first then the rate of fire gradually dropped until it came to a stop. I believe your next to last statement is on this point. The batteries are to be connected to a 6 cell pcm (protection circuit board) through which the circuit will draw the supply. Edward This requires electronic filtering to compensate for noise and voltage fluctuations induced by the battery and the charger. Then the recommended charge time would be 15 hours. Thinking it was just a production flaw, I tried another one. (Fresh out of package, comes stock with a minimal charge.) I have had four Duracell AA rechargeables that have worked well for about five years, give or take a year. Within the boundary of constant current charging, there are several techniques that can be adopted to prevent overcharge. If you bump or touch the batteries at this time, the phone speaker statics out. Capacitance (C) in Farads? Couple of points:  1) Are you using default charge settings? Hi! 3000 divided by 100 equals 30 hours, but since your battery is hopefully not dead, that is: zero charge (not good for the battery), 24 hours should be long enough. How can I do this? BU-206: Lithium-polymer: Substance or Hype? if the charging current is low and the charging time is not long, the battery will be cool also. I am tasked to provide a battery operation feature for our alarm products. 4 of the cells in the pack are 2100mAh Ni-MH 1.2V and 4 of the cells are 2000mAh Ni-MH 1.2V. Re: my previous (incomplete) post, the question is: Does one of the thermistor leads get tied to the Black - lead? I do not like the inconvenience of waiting for the headphones to charge the two internal Accu 800 mAH NiMH AAA cells if I let the batteries go dry, but I also don’t want to overcharge these two cells and shorten their usable life by always placing the headphones back on the base station each day after use. As a school project we have to design the circuit of a charger of a NiMH 3.6V battery. Why? What do you think about Low Discharge NiMH? Hi guys! The ones that showed half a volt before charging will charge up, and work OK for a few hours’ use in a LED flashlight _if_ used immediately after charging; but lose their charge within a day or so. Look around your shop for a variable supply in the 24v range that also has current limiting. Best regards, One of the reported issues with this lantern is internal corrosion. Also, at .5c, it seems like people chart better NDV drops than 5mv per cell. Please refer to my earlier notes on the correct use of the character ‘C’ as it relates to charge rate. I always fully discharged my half used NiMH batteries before putting them into the slow charger. BU-306: What is the Function of the Separator? Since I read that a trickle charge rate of C/300 is recommended, would a higher value resistor help to increase the life of the battery? Is this bad? Thanks, Herman, I am hoping you might be able to help me out…. It can sense a drop of 2.5 mV after peaking, and uses averaging of several voltage measurements. The best method is to charge to the beak while monitoring temperature, voltage, current, charge rate, etc and then add extra charge to top it off, maybe as much as an extra .2C where C is Capacity of the battery. in my opinion, you would better not connect the ni-mh battery in parallel form..  because they have different resistance and capacity.. my email is [email protected]   we advise you can choose the Lithium battery 3.7V 3800mah, only one Lithium battery will decrease the problem.. Hello! The statement that NICd chargers aren’t good for Ni-MH cells does not take into account the four-fold increase in cell capacity that took place over the time period where Cadmium cells were displaced by metal hydride cells. What’s the most appropriate charging rate for 1900 mAh AA and 750 mAh AAA Eneloops? and so on I takes 2 C batteries to operate it. While NiCd batteries may be trickle charged at a rate of around 0.1C, this is considered too high for NiMH batteries and it is generally accepted that for most NiMH batteries trickle charging should be accomplished at a rate of about 0.05C. I just wanted to recharge them to go away, for my camera, and have had them in the Duracell CEF14N, class 2 charger for about 10-12 hours, and it’s still displaying a red light, and the batteries are pretty warm. Thanking you for your help ! thank you. I think it is not an issue, you can try to use the battery to check if they can work. Typically .5C is a good limit. I is used as the symbol for Current not C. i have 5000mAh lipo 2 cell, 7,4 V battery. I’m thinking of fitting an LED based high-accuracy voltmeter to monitor the battery and let me know when to charge it. Just frustrating since the slow charger takes a long time. Is that true? The charge continues at a lower current and then applies further current reductions as the charge progresses. I have a 14.4v nicad 1.2 amh battery for my draper electric drill,  the nicad pack has gone to heaven and will no longer hold a charge. recently I bought a smarter charger with 4 chanels and damaged battery protection , and it sems that 3 batteries are damaged (and this charger don’t charge them) ... Many intelligent chargers for NiCds sense a small but distinct "bump" in the output voltage when a NiCad is fully charged. 1. regards, If I need it a battery bank autonomy of 24.0 vdc -50 Ah and using a Ni’-Cd BATTERY 1.2VDC 500 mA -For 8 hrs. FET     All this is taught above. Charging Energizer 2100 NiMH AAs in an hour usually results in a cell voltage of 1.4-1.45V. I have found a charger but don’t know wether it is compatible as the mah is considerably higher . I am thinking about operating this device with two parallel sets of NiMH cells (AA Eneloops with 1900mAh), each consisting of seven cells. Firstly ,the charge time is 21hours is not reasonable , it is too long time, when the battery is fully discharged ,you must to wait too long for the sencond discharge I mean i couldnt get a charge in them before on 1 setting. No, the battery resistance likely goes down as it approaches full charge. A NiMH in a NiCd charger would overheat, but a NiCd in a NiMH charger functions well. In case Frank is still policing this site, please note I used the correct case for the ‘A’ in milliamp hours. My circuit would function as a precision shunt regulator and would limit the max. In this case battery will be constantly charging. Could there be some kind of coding between the Energizer batteries and the charger? going down to 0.1V per cell can renew cells even better but I would not exceed a discharge rate of C/60 if you want to go this low. Perhaps the charger is defective and is applying a charge rate that is way too high! If there any way to predict remaining life based on the voltage??? The old trickle chargers I had for 600mAH NiCd cells might not be well suited for 600mAH Ni-MH cells, but AA cells in Ni-MH are now 2,000 to 3,000 mAH, so the fast trickle charger that pumped 0.2C/h into a 600mAH NiCd cell is now a slow trickle 0.05C/hr charger, even though the 120mA current flow has not changed. Hi, Can you describe how the connection between the pack and the charger works? About this: “It is difficult, if not impossible, to slow-charge a nickel-metal-hydride. As NiMH cells are more sensitive to the way they are charge when compared to other forms of rechargeable battery, care needs to be taken to adopt the correct NiMH charger and also to use it properly. At such a low current, how would you advise detecting when it is full enough? (by design 24v, run in series)  Do NiMH batteries give off any gasses while charging? If the discharged battery voltage is less than 1.0 Volts/cell start with a C/10 charge. It is safe for me to tweak my nimh charger so that at the end of the charging process, the initial voltage of my nimh batteries would be at 1.6v instead of 1.2v. Many modern NiMH chargers combine the three main methods of end of charge detection, NDV, temperature rise detection and then using a timer as a last ditch end of charge termination in case the other effects are masked or pass undetected. hi, please send to my email one cell was totally discharged and shows 0V. So I would think a starting point of 18-20v would be about right for a 14.4v pack, but again, it depends on so many factors not the least of which is the age and condition of the battery cells. I supply certain electronic equipment that has standby battery operation for a few hours in the event of power failure. Please reply with the standard battery number. But having tried that (1000mA for a 2000 mAh battery) the battery’s still getting pretty warm, and that can’t be good. It is very hard to find a replacement charger. Hello. I’m now using decent batteries (Eneloop AA and AAA) and a couple of decent intelligent chargers (both able to vary the input current) but I’m genuinely puzzled by all the information floating around the net about NiMH batteries. The manual is not clearly telling nor battery nor charger specs, moreover, the charging light seems never to go off. On my trial rig, I monitored cell temperatures and they never rose 1 degree Celcius above ambient when they were fully discharged. Can I even do this safely? For everything from distribution to test equipment, components and more, our directory covers it. A new charger is very $$$, and the money would be better spent on a a new drill - UNLESS I can use a power supply to charge it. So I have to replace one battery with a circuit that will make the charger believe that there are 2 batteries connected. Is the 4 channel charger or series charging is better? My problem is buying a suitable charger for them. what is the charging current and the charging time? With 40% of the cell DOD (or with 4%), you get close to none until you removed the dead cells and rearrange the bank to give you the same bank-voltage. and to get 10Ah, you will need at the very least 5 of these 10 celles strings connected in parallel 8.4 volt 3300 mAh Ni-MH rechargeable battery. Yes, if it’s a lab power supply, or something you can thrust, 2. I would like to charge them as quickly as possible, can you help please. Some advanced chargers apply an initial fast charge of 1C. We have a pager system and we are using a multi unit charger and 1.5 V AA NiMH batteries. Hi Edward I guess my question is:  will the original charger (Uniden model number AD-140U) which supplies input of 120V at 60Hz and 14W and a DC output of 12V and500mA work for the new battery pack?

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