Test/review of Delipow 9V LiIon 800mAh (Yellow-green)

Batteries and Chargers Rechargeable Batteries
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Delipow 9V LiIon 800mAh (Yellow-green)







Official specifications:

  • Battery Type: Li-ion Battery

  • Rated Capacity: 800mAh(0.2C discharge)

  • Rated Voltage: 8.4V

  • Discharge cut-off voltage: 7V

  • Charging Voltage (standard): 9V

  • Discharge current (standard): 50mA




A cheap LiIon 9V battery from China
Overcharge protection on the A cell kicks in at 8,46 volt and over discharge protection at 5,53V
Overcharge protection on the B cell kicks in at 8,46 volt and over discharge protection at 5,56V












It do not have the rated 800mAh, but the discharge curves looks good for a 590mAh battery.











Conclusion

The capacity rating is too high, but it looks like a acceptable LiIon 9V battery.



Notes and links

How is the test done and how to read the charts
Compare to other 9V batteries: Alkaline/NiMH/Lithium/other
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It looks like there is no overdischarge protection?

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Sorry I forgot to add that, it is included now.
I will expect it to be below 6V and it is.

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But what do we know about the protection circuit? Has anyone seen good data on these protection circuits tested or examined for quality?

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8.4 volts (when freshly charged), and around 7.5 volts over most of the run time, just won’t cut it for a lot of devices that require 9 volt batteries. I have smoke detectors that start sounding the low battery warning at around 7.6v. I use NiMH 9v batteries in them, but they use 7 internal cells for a total of 9.6v.

This battery would start sounding the warning way too soon. Though, the greater capacity might still give it a decent run-time.

BTW, how do you charge it? It must come with a special charger?

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Battery seems equipped with a proper management system. Undervoltage protection is likely set at 2.75V/cell (battery cut offs: 5.53 and 5.56V). Cell balancing may be absent, of course.

There are some specific chargers for this sort of stuff, WalkIntoTheLight, Soshine has some for example. Peek here: “soshine 9V charger” search at FastTech

It can also be done with a generic CC/CV power supply, just set maximum voltage and current to the desired values. HKJ used 8.4V and 0.2A for the above-mentioned charging graph.