![]() If they lack an LCD display or provide inadequate info on it, the way to do that is insert a double sided thin piece of copper clad PCB material (in series with the battery contact against the charger contact), with multimeter probe connectors soldered to both sides, so you can measure with a multimeter during the process, what the current is doing, except in order to measure the current the meter will insert a little more resistance to pull the #'s down a bit.Įven if they are using Delta -V, that does not guarantee they work well to fully charge the cells. If you have more specs that might help, or otherwise the thing to do is measure what they're doing. That can vary by cell design but a rough ballpark is around 25% of the capacity so for a 2000mAh rated cell, 500mAh charge rate, BUT, depending on the charger design, it may put less current through a battery with a higher internal resistance. It is gentler on batteries to charge them slower, but for the most reliable Delta -V voltage detection, the charge rate must be above a certain % of their capacity. I doubt either lack both the Delta -V and a timer shutdown feature, because that would make them terrible, but it's not impossible. ![]() If neither is Delta -V terminating, they might use a timer circuit then overcharge or undercharge the cells depending on the charge state when inserted and their rated (vs real remaining) capacity. Probably semi-close and possibly comparable between two models from same brand, but how close they stick to the #s depends on how they are regulated and the charge scheme used, whether constant current. Sometimes the specs can just be "up to" numbers, that don't really indicate what they're doing at any particular point in charging any particular cell capacity. If it does not time out then it will cook the cells slowly. The specs not on the labels are more important, for example whether either is a Delta -V terminating charger and if so, does it then trickle charge indefinitely or time-out after some period. Whether a faster charger is better depends on its method and accuracy in measuring charge state and terminating the faster (if not only) charging mode, then if any, what the lower aka trickle charge mode does too. If the charger you use is only capable of 250 mA, then it will take twice as long. Actually, it will take longer, because when the battery is nearly full, the charging rate will be reduced to less than 500 mA rate. ![]() For example, if you use a charger that actually pushes 500 mA charging rate into a nearly-dead battery with a 1100 mAH capacity, it will take 2.2 hours to charge it fully. You'll never find that on a charger, but you will find that on a battery to specify its maximum stored charge quantity. ![]() The total QUANTITY of charge pushed into the battery is that rate times the time of operation, usually spec'd as mAH - in words, milliAmp - Hours. Amperes is the RATE of current flowing into the battery to charge it. You seem to have misunderstood the specs for QUANTITY of charge. BUT that may well mean that if you charge TWO AA batteries, they must share the 500 mA charging rate, so each will be charged at a rate of 250 mA, which is only 1/4 the rate of the charger on the right. As far as the number of batteries in a group being charged, I'd guess that the one on the right is wired always to charge two identical batteries in series (or two pairs for a total of four), whereas the one on the left is wired so that all charging slots are in parallel. Yes, the charger on the right can push higher currents into batteries to charge them faster.
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