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

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

Delipow 9V LiIon 800mAh (Yellow-green)

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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

Delipow%209V%20LiIon%20800mAh%20(Yellow-green)-info

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

DSC_0244 DSC_0245

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Delipow%209V%20LiIon%20800mAh%20(Yellow-green)-Capacity

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

Delipow%209V%20LiIon%20800mAh%20(Yellow-green)-CapacityTime

Delipow%209V%20LiIon%20800mAh%20(Yellow-green)-CapacityTimeHours

Delipow%209V%20LiIon%20800mAh%20(Yellow-green)-Energy

Delipow%209V%20LiIon%20800mAh%20(Yellow-green)-Charge



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

My website with reviews of many chargers and batteries (More than 1000): http://lygte-info.dk/

Edited by: HKJ on 09/13/2017 - 17:05
lagman
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It looks like there is no overdischarge protection?

My English isn’t perfect but I’m trying to improve it. If you see something that doesn’t sound right or is just plain wrong, please feel free to point it out! Smile

HKJ
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lagman wrote:
It looks like there is no overdischarge protection?

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

My website with reviews of many chargers and batteries (More than 1000): http://lygte-info.dk/

firedome
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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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WalkIntoTheLight
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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?

Barkuti
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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.