Hi, it would be interesting to see how well this ZTS works. I have tested the ACT Gold Plus, ACT 612 and ACT Chrome testers. All were reasonably accurate on small lead acid batteries of around 17 amp hours or less. On larger batteries above around 40 amp hours capacity, the accuracy was way out.I have done lots of comparison tests on both wet and AGM batteries. One battery rated at 95 amp hours I tested read 85 on the ACT ones.On doing a proper discharge test, this battery was actually only now really giving 32 amp hours down to 10.8 volts at the C/10 rate, using Fluke multimeters. My experience is that batteries that are capable of giving a high current can fool some testers into 'thinking' they still have a high amp hour capacity, even if they are actually only a fraction of their new capacity. I have not tested the ZTS unit , so to be fair, this one might work better. All testers that take high current pulses of say, 18 amps, are going to need very good connections to the battery on test for reliable readings, act testers certainly do. Conductance testers and load testers certainly tell if a battery is really useless, but for an accurate amp hour test of larger lead acid batteries I haven't found anything that can accurately do the job short of drawing a fixed current down to 10.8 v over many hours.
Always test the battery twice for proper results!
Hi, it would be interesting to see how well this ZTS works. I have tested the ACT Gold Plus, ACT 612 and ACT Chrome testers. All were reasonably accurate on small lead acid batteries of around 17 amp hours or less. On larger batteries above around 40 amp hours capacity, the accuracy was way out.I have done lots of comparison tests on both wet and AGM batteries. One battery rated at 95 amp hours I tested read 85 on the ACT ones.On doing a proper discharge test, this battery was actually only now really giving 32 amp hours down to 10.8 volts at the C/10 rate, using Fluke multimeters.
My experience is that batteries that are capable of giving a high current can fool some testers into 'thinking' they still have a high amp hour capacity, even if they are actually only a fraction of their new capacity. I have not tested the ZTS unit , so to be fair, this one might work better. All testers that take high current pulses of say, 18 amps, are going to need very good connections to the battery on test for reliable readings, act testers certainly do.
Conductance testers and load testers certainly tell if a battery is really useless, but for an accurate amp hour test of larger lead acid batteries I haven't found anything that can accurately do the job short of drawing a fixed current down to 10.8 v over many hours.
Wasn't sure these guys were still hanging around.