18650, 26650 and NP-F batteries and capacities

[-jeff]

UPDATE....

Here is a quick update the battery testing I have done in the last few weeks.

I have been purchasing NP-F style batteries from Amazon for testing and choosing packs that are listed "Amazon's Choice" or packs with a high star rating. Each pack is charged to 100% before testing. The test applies a 450mA load to the pack and records the time required to drain the pack down to 6 Volts or about 10% remaining charge.

Powerextra NP-F960/F970 7.4 Volt, 8800mAh, Amazon's Choice and five stars with 1,602 global ratings.

First test = 6643mAh
Second test = 6130mAh
Third test = 6294mAh

On the inside of the Powerextra are six 18650 cells, each rated at 2000mAh.

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The cells are connected in a 2S3P configuration. So, each cell is 3.7 Volts and 2000mAh. In this configuration the total possible rated mAh would be 6000mAh, 2800mAh less than advertised.

DSTE NP-F970 7.4 Volt, 7900mAh, Amazon's Choice and four and a half stars with 386 global ratings.

First test = 5822mAh
Second test = 5628mAh
Third test = 5589mAh

On the inside of the DSTE are six 18650 cells, each rated at 2200mAh.

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The cells are connected in a 2S3P configuration. So, each cell is 3.7 Volts and 2200mAh. In this configuration the total possible rated mAh would be 6600mAh, 1300mAh less than advertised.

Powerextra NP-F980L 7.4 Volt, 10050mAh, Amazon's Choice and four and a half stars with 34 global ratings. This battery has a micro USB B connector for charging and a USB A connector to use this pack as a power storage device that can be used to charge a cell phone, camera, etc. It also has a charge level meter.

First test = 9710mAh
Second test = 9287mAh
Third test = 9526mAh

I have not taken this battery apart yet but will in the future.

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So far I am impressed with this battery and looking foreword to trying it in a camera trap. I like the ability to charge the pack with a common USB cable. The pack is 3/4" taller than a common six cell NP-F pack.

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Vemico NP-F980/F970 7.4 Volt, 7800mAh, Amazon's Choice and four and a half stars with 203 global ratings. This battery has a micro USB B connector for charging and a USB A connector to use this pack as a power storage device that can be used to charge a cell phone, camera, etc. It also has a charge level meter.

First test = 6211mAh
Second test = 6192mAh
Third test = 6304mAh

On the inside of the Vemico are six 18650 cells, each rated at 2200mAh.

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I pried the Vemico open just enough to see the cell capacity and configuration. The cells are connected in a 2S3P configuration. So, each cell is 3.7 Volts and 2200mAh. In this configuration the total possible rated mAh would be 6600mAh, approximately 1200mAh less than advertised. The pack is 1/2" taller than a common six cell NP-F pack.

More to come.

[-jeff]

Wasabi BTR NP-F960-JWP 7.4 Volt, 8500mAh, Amazon's Choice and four stars with 90 global ratings.


First test = 4292mAh
Second test = 4089mAh
Third test = 4353mAh











I disassembled the Wasabi pack to investigate further. The Wasabi pack has four unlabeled rectangular cells and a couple pieces of steel taped on top. I don't know the purpose of the steel other than to add a little weight to the pack. It serves no electrical purpose.

[Bernardo Segura]

amazing information, thanks!!