Lithium battery test with a 6.4 amp power supply

[Isetech]

Can you take a picture of the "Black Thing" that got hot.
Does it have 2 or 3 legs?

This is your department, I was hoping you could give us a little better understanding of why this component would get so hot.

I was told it has to do with the charge characteristics of the lithium battery. Maybe you can do a better job of explaining more about charging lithium batteries and why it wqould heat up components on a the power PCB.

I have a blue nova and a seuri prod lithium battery on other test rigs (X64 alarm panels) and they seem to be doing ok, I have drained them both and recharged them both, I haven't scanned them with the thermal imager yet. I plan to drain them both till the BMS low voltage cutout, then power them up still connected to the alarms panels and do a thermal test.

At the end of the day it doesnt help dropping in a lithium battery if t is going to affect the PCB life span due to overheating issues. I would rather just stick to using lead acid for the next 12 months. I hear both suppliers are in the process of testing new PCB's with lithium charging capabilities.

By the way I have cut open both Blue Nova and the securi prod lithium drop in batteries, and as expected you basically get what you pay.

The Blue is a well built unit with the cells in a solid resin, compared to the Securi prod, its just look like a home made shrink wrap with the cells enclosed with the BMS, dropped into a 7 amp/hr PVC enclosure.

I would love to see the cells and BMS specifications for both these batteries.

From the little research I have done, Blue Nova has different levels of lithium cells, one which is rated for daily use and the other for backup. The life cycles and warranties are considerably different.

I believe it is important you look at a life cycles, the BMS and cell warranty period when deciding on the lithium battery you buy. It is also important to check the charge and discharge rates.

I believe the battery industry should be regulated with standard data and specs shared by everyone.

I am no expert in this field, just trying to find my way through the maize, feel free to set the record straight and share your view.

[Justloadit]

This is your department, I was hoping you could give us a little better understanding of why this component would get so hot.

Without knowing what this component is, I can not offer any further information.

Lithium batteries, unlike Lead Acid, internal resistance remains almost constant throughout the charging cycle, accept for when it reaches fully charged state, in which the current practically drops to almost zero, unlike a Lead acid in which the current remains fairly high, causing battery damage if the charger is not removed.

So any Lithium charger must maintain a constant current, constant voltage(CCCV or CVCC) through out the charging cycle. By regulating the amount of current, you can match the 'C' requirements of the particular battery.
Of course there is always a trade off between minimum charging time and battery temperature. The Lower the 'C' charge the longer the battery lifespan cycles.