Connect the resistor as short time as possible; otherwise the test is not correct since the batteries will discharge too much. Do you have 2 batteries in parallel, connected to one charger? 2) i have a 12V battery of capacity 10Ah..can i charge it using a 250mA current which is provided by the DC DC booster circuit..? regds, This is actually better to prolong battery lifetime. Tried to trickle charge it with an old cordless phone base but it was not really charging at noticeable rate in 4 -7 hrs of checking it closely. When your battery voltage reaches 13.8V, you can consider it full. Thanks a lot . If your generator requires 19V charging voltage, it is very well possible that the battery inside has a lower voltage, like 12V lead, or 14.8V lithium, and some circuit inside the O2 generator to adjust the voltage and current. So you need to screw the regulators onto a small cooling profile. It won’t get very warm, certainly not for your short and intermittent use. The phone itself takes care of the charging process; you don’t have to worry about it. and please ddo provide a suitable way to recharge it.. How long should I charge the battery? I'm not sure you can get a lead acid 12v battery to stay at 17-18 volts no matter what you did to it. 12v adapter with battery charger pin - 20no’s Good luck, and be careful with those voltages! Then you get a 15V very powerful charger. to Yomi: But it will probably not draw any current at all. Behind this stage comes the voltage regulator stage from figure 1. State of charge does vary a little between a sealed lead acid, flooded, gel and AGM deep cycle battery types and also between brands. You can google for a suitable charger. thank you very much. I have a Halfords branded car battery booster / starter pack which I have just replaced the 12v 20Ah battery in after 15 years. is there any charger to charge it, can you send to me the electronic circuit diagram for rechargeable battery, Hello, I am seeking a bulk charger for a 20s large capacity (64ah) ev lipo pack, I’m looking at an 80v 12.5a switching power supply to stay under the max 84v for the pack and get reasonable quick charging. Look for a load voltage on a battery charger of 14—15 volts or higher. As for the battery eliminator, here is the link http://www.learningaboutelectronics.com/Articles/How-to-build-a-DC-power-supply.php to the site from where I got the schematic on how to build it to achieve about 53 volts dc. Have 2 Lithium ion battery packs of 72V 20Ah each, and I want to charge them. Once low enough, they are full. The opamp would then directly control some MOSFET’s. 1) a charger of 6v above and 400mah above But this also depends on the impedance of the charger; if it drops voltage to a lot lower with just a small load, it could be usable. I want to install a 100w solar panel with either an mppt or solar charge controller. I’m just not sure that the power supply is correct, will it stop charging once the packs reach 80v? A 12V battery that has now 2.7V will probably be permanently damaged. The negative terminal is labeled “-.” Connect the red positive cable to the positive terminal of your battery using the same method. 100 degress F is plenty. Select the charge current according to battery size. It will be a slow charge, but that won’t harm the battery. 1_ how I can calculate full charge state for healthy led acid battery? Thanks. @ Glenda E.Sia: Li-ion cells require a specific charger. If you keep it at 14.5V, the battery will get damaged. And also i have another question i have put a dynamo of 12v 1200 rpm and i get an output of 5v/8v/13v. Question - can I leave the solar to charge the batteries at the same time as the alternator is running? I have 2 x 12v both 175AH lead acid bettries connected in series. “-” input of opamp to top side of wire. The 12 Volt Outlet on the generator will not be powerful enough to provide this much amperage. The battery for the laptop being used is 9000Mah at 11.5v. The table below shows the voltage and approximate state of charge for each type of battery. 3. I’m having an issue with arcing in the USB ports and the power input. Now it won’t charge the boat at home. 5 in series need 20.5V to charge correctly. Resistor will heat up but that is no problem. Resistor value should be (19V-14V)/2Amp = 2.5 ohm. This would not make the battery freeze. You can put that voltage onto the batteries and they will charge until full. I don’t even know if it’s a plausible theory. Plz answer correctly this time that I want to run&use; this SLIME 12 voltDc tyre inflator by my domestic line 230 Volts.It is mentioned in that slime instruction manual the specification as 12Volt 15AMps or 180 watts like that.Plz suggest what type of line adaptor I have to use for using this SLIME inflator-pump for inflating my Bike tube from home insted of connecting with 12 volt Lead acid Battery inside my car.Plz suggest directly instead of telling round about way as yu r claiming experts in Battery,Transformer,Charger etc usage experts by email reply as given early at the earliest. scooter battery (3-12’s) Would it do harm to charge them with a 36v -1.8 amp charger? For a 12v lead acid this is typically 14.4 v (fast) and 13.8 (standard) and maybe 13.1 (maintainance.) I have an ebike with 54.6v charger, I want to charge it at 52v tops, can I use a regular power supply with same or lower amps for extended period of time connected to the battery? Which charger is best and what its output(amperes an volts) values should be. The banks are isolated during starting and otherwise combined for charging and electrical use. Where do the charging control circuits reside for Li-Ion powered devices (e.g., cell phones, laptops, etc.)?
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