I have an old sealed lead acid battery (Yuasa EN320-2RS) which has a
2V output and 320Ah capacity. Although it was never used much, I guess it is about seven years old so is probably long gone and I intend to buy an identical replacement.I also have a lead acid battery charger which I tried on the aforementioned battery without success. The charger is a
2/4/6/8/10/12V multi-range 1A float battery charger, which I bought a few years ago from RS Components (part 129-684)Without a battery, I'm not sure how to test whether or not the charger is working properly. The green "charged" LED lights up when the 2V or
4V range is selected, even though there is nothing across the output terminals. Measuring the o/c d.c. voltage and s/c current across the output terminals gives readings of a few hundred millivolts and microamps.I looked inside the charger and there is no sign of overheating anywhere.
At the a.c. power supply input, there is a step-down mains transformer and some large electrolytics and several rectifier diodes. On the p.c.b., there is one LM339N quad comparator (which has a voltage of
7.6V between its supply pins 3 and 11). A TIP3055 power transistor on a large heatsink is also present and a few small signal transistors. Other than that I can only see resistors and a few small signal diodes and zeners.Please can anyone suggest a few simple tests that I can carry out to verify whether or not the charger is working properly? What can I put across the charger's output terminals to simulate a battery?
Thanks folks.