Blog - Tests and diagnosis

A battery pack keeps discharging “by it-self”

Email:Unfortunately, I do not have good news. We faced again a strange situation. The system was not used in the past 2 weeks, there was no grid shortage, the system was not used, and the BMS show that the battery pack was full, please see below the inverter log.

It is obvious from the voltage that&nb

30.Nov 2020
| Blog - Tests and diagnosis

We are moving electrons. A lot of them!

When cells are charged and discharged, the volume of the mass inside the cell is changing. This is because the electrons have a mass and this mass is added or removed when charged or discharged.

How many electrons are moved when working with the current of 1 Amp?

The electron flow produces current. T

16.Nov 2020
| Blog - Tests and diagnosis

BMS123 or GWL CPM? - Deeply discharged cells

As our customers are well aware, some type of protection module is necessary to use with every lithium battery for prevention of a deep discharge or overcharge.

I will use the example of our customer from Holland to describe how a significantly cheaper GWL CPM protection can often be the better choice th

06.Nov 2020
| Blog - Tests and diagnosis

GWL-CHL110AH - IFPE110 - Lithium Cell LiFePO4 (3.2V/110Ah)

The discharge diagrams for theat 36A, 55A and 100A currents.

20.Jul 2020
| Blog - Tests and diagnosis

GWL 40AH LTO Capacity Tests

The charge and discharge diagram for the LTO 40AH cells.

Customer requested to prove the real capacity before the shipment. We are happy to demonstrate that the cells meet the specifications as declared.

04.Feb 2020
| Blog - Tests and diagnosis

Overcharge of the TSWB cell

The diagram shows the overcharge of the TSWB cell and the temperature increase.

The cell is overcharged (after already being fully charged) gradually to 5V, 6V and 8V per cell. The temperature is monitored. The temperature reaches some 130*C.

The total time of the test is 30 minutes. During the test

06.Nov 2019
| Blog - Tests and diagnosis

Puncture test calb

CALB SE Series Puncture Test (video)

Result is simple: 100% save - no fire, no explosion, no overheating, no burning of the plastic case. Only the smoke from inside the cell caused by the internal short-circuit. ()

21.Jun 2019
| Blog - Tests and diagnosis

SLA vs LFP battery extreme discharge test

What is the difference between SLA and Lithium Iron Phosphate (LiFePO4, LFP)? One of the most frequent questions now answered. Rather extreme discharge test of two SLA and Winston 12V battery.

About Winston batteries: Large capacity LiFePO4 prismatic cells and batteries. Thundersky – Winston Ba

21.Jun 2019
| Blog - Tests and diagnosis

SLA vs. LiFePo4 (LFP) battery, extreme discharge test

What is the difference between SLA and Lithium Iron Phosphate (LiFePO4, LFP)? One of the most frequent questions now answered. Rather extreme discharge test of two SLA and Winston 12V battery.

About Winston batteries: Large capacity LiFePO4 prismatic cells and batteries. Thundersky – Winston Ba

10.Jun 2019
| Blog - Tests and diagnosis

Swollen battery – Use or not to Use?

Question:We have a set of battery packs. We have noticed that in one of the packs the cells bulked and changed the shape.Is it safe to keep using the battery pack?

Answer: Generally said if there is any change of the shape of the case of the cells it indicates thatthere is some issue with the

30.May 2019
| Blog - Tests and diagnosis
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