Description
Details
These are capacity tested. They are not tested under compression. Thickness after test up to 1.7mm extra. This is fully reversible under compression (+-300kgf)
Manufacturer: Envision
Model: ESS 4LH3L7 280A
Dimensions: 71mm x 207mm x 173mm
Capacity: 280ah
Weight: 5.45kg
Maximum discharge: 280A (1C)
Rated Voltage: 3.2V
Above: including screw terminals, busbars and screws.
Protection: None
cycle life to 70%: 10000 cycles!
Additional Information
Details
Reviews
Customer Reviews
- It's okay. Review by Olena
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Capacity and resistance is good - same 286A and 0.006ohm - as new ones, but code is damaged and geometry is far from good. Pillow effect, with 3-5mm gaps between batteries.Rating
Overall can be used, but be aware that total package will be bigger due to body distortions. Not sure if this 4% discount worth it. Let see in couple years if there any difference. (Posted on 22-11-24) - good quality Review by Viacheslav
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good quality. geometry without defectsRating
voltage good i bought 8 cels & all 3.208v (Posted on 29-10-24)
Write Your Own Review
B-grade cells are cells usually did not qualify as A-grade by the manufacturer. This may be due to optical imperfections, higher self-discharge, lower capacity and/or higher internal resistance. Unfortunately manufacturers don't tell which aspects or aspects are the reason to mark a a specific cell as B-grade. We have sold several and get seldom negative feedback. We tested several eve B-grade and one had about 2% lower capacity, the other ones we did not find a difference with A-grade cells. We don't advise B-grade for high performance electric vehicles but for home energy storage they will work fine. In case you get one which performs significant less than the others like lower capacity, high self-discharge or fast wear we will replace it. Take care that we don’t put a lot of trust in a simple test of a single cell, if you buy 16 cells and you test them and they are all 6% lower than expected then your test gives to low results. If you buy and test 16 and 15 cells give you 100% and one cells gives 5% lower results then we will replace one. When we buy cells the cells are tested for voltage and internal resistance. Also a couple of every batch are tested for capacity, and if one gives less than 100% capacity we test the whole batch and discard the bad ones or don't buy the batch at all. Lot of seller in china buy B-grade cells, test them, even swap qr-codes and sell the good looking and performing as A-grade cells. We believe our B-grade cells are the same as lot of A-grade cells from China, including the well known resellers there with good reputation. We give regular warranty on these cells (at least 2 year).
