Recent content by thunderheart

Original article: https://www.thunderheartreviews.com/2021/12/samsung-21700-50G-48G-50E-test-comparison.html Samsung has a good lineup of 21700 Li-ion batteries and when i tested INR21700-50G i thought it would be interesting to test INR21700-48G cell too because the new batch of 48Gs came in...

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After publication of my test another 2 versions of datasheet came out and i summarized the differences in a table and updated the article.

There is no secret - you can order in their store on Aliexpress or drop them an email to order directly (payment should be done by PayPal). As far i had no problem with them and if there are Grade B cells they declare it clearly. After testing A123 cells i ordered Grade B cells for one of my...

Original article: https://www.thunderheartreviews.com/2020/12/queen-battery-qb18650-2500mah-5C.html In Queen Battery's lineup QB18650-2500 stands very close to QB18650-2600 not only by capacity rating but also with max supported discharge current - the 2500mAh cell supports 5C or 12.5A and the...

Hi guys. It's been a long time i didn't post here and here i'm back:) All this time i was thinking on making a new holder for my tests and eventually i've designed and made one which i'm ready to show you. Here it is - my holder version 4.0. All your thoughts are precious for me so don't...

A 250 cycle test??? Never tried

Original article: https://www.thunderheartreviews.com/2020/02/sanyo-ur18500fk-1700mAh-18500-li-ion-battery-test.html Sanyo UR18500FK is a 1700mAh rated 18500 cell capable of giving up to 3.24A continuously. 18500 size means a cylindical cell with 18mm diameter and 50mm length - 15mm shorter...

Original article: https://www.thunderheartreviews.com/2019/09/sony-vtc5-test-review.html Sony VTC5 or US18650VTC5 is a 2600mAh 18650-size Li-ion cell which supports continuous discharge at up to 30A with 80°C temperature cut or up to 20A with no temperature control. VTC5 can hold up to 100A...

You know what? I really love this culture of discussion full of respect to each other. It's a pleasure to read you comments, guys! :thumb:

You drop them an e-mail, discuss the order details, the price, then pay by PayPal. Their prices are higher on Ali due to Ali's fees.

I wasn't able to get any reasonable answer from them. I think they just allow wide margin of IR for a batch but the cells i got have very low difference and fluctation. Even lower than 2500mAh cells. So i think there is no real reason behind that restriction, especially if you test the IR before...

Exactly. 13.7% at 13A.

Original article: https://www.thunderheartreviews.com/2019/09/queen-battery-qb26650-2300mAh-lifepo4.html QB26650-2300 is the second LiFePO4 model from Queen Battery. The 2500mAh cell i tested recently and i'll compare the two QB models to A123 Systems ANR26650M1B Grade A and Grade B cells...

What a discussion, guys! Love things like that! So, here is the 0.2C/1.06A discharge map starting at 4.179V (the voltage of the cell charged to 4.20V/100mA cut-off and left 1hr): 4.1V: 98mAh 4.0V: 552mAh 3.9V: 1004mAh 3.8V: 1527mAh 3.7V: 2027mAh 3.6V: 2763mAh 3.5V: 3850mAh 3.4V: 4575mAh 3.3V...