NexPower NexCell LiFePo Battery Upgrade

nice, well done!

 

It has double the voltage (14.4ish per module, rather than the 7.2ish of the original modules). Each of these replaces a block of two original modules, and has the same voltage overall as the two it replaced. It also has roughly the same Ah capacity as the block it replaced, which is the same as the original modules. Ah capacities in series don't add.

 

your battery is labeled lithium-ion, not lithium iron phosphate. LiFePO4 cost waay more than li-ion. In your shoes I’d get my money back, you paid LiFePO4 money for a li-ion battery.

 

Interesting point. Are LiFePO4 and li-ion mutually exclusive? Or is li-ion the broader term, of which LiFePO4 is one type?

If the first, maybe the thread title should be changed. But Wikipedia seems to come down on the side of the second.

"... is a type of lithium-ion battery using lithium iron phosphate (LiFePO4) as the cathode material ..."

I see the thing is also labeled 16.0 volts, which is the nominal voltage you would have if you stacked five LiFePO4 cells.

 

Still, worthwhile to get it cleared up, so future readers of the thread don't get the wrong idea. Maybe @jacktheripper can comment? The Torque News article also says it is LiFePO4.

 

No, lithium-ion is a family of chemistries, and lithium iron phosphate is one of the family members. The family seems to have grown since I was looking at them for work purposes a decade ago.

Here are the first articles that popped up for me:

Six Lithium-ion Battery Chemistries: Not all Batteries are Created Equal

The Lithium-Ion Cells and Chemistries You Need to Know

Explaining Lithium ion Chemistries | LithiumHub

... or buy the book:
Lithium-Ion Battery Chemistries: A Primer
Lithium-Ion Battery Chemistries | ScienceDirect

"Lithium-Ion Battery Chemistries: A Primer offers a simple description on how different lithium-ion battery chemistries work, along with their differences. It includes a refresher on the basics of electrochemistry and thermodynamics, and an understanding of the fundamental processes that occur in the lithium-ion battery. Furthermore, it reviews each of the major chemistries that are in use today, including Lithium-Iron Phosphate (LFP), Lithium-Cobalt Oxide (LCO), Lithium Manganese Oxide (LMO), Lithium-Nickel Manganese Cobalt (NMC), Lithium-Nickel Cobalt Aluminium (NCA), and Lithium-Titanate Oxide (LTO) and outlines the different types of anodes, including carbon (graphite, hard carbon, soft carbon, graphene), silicon, and tin."

 

with that reasoning, ni-cd is the same battery as ni-mh.

 

It'll be up to you to explain why you think that analogy holds.

 

Would you also include the lithium-ion family members lithium-nickle-manganese-cobalt (NMC) and lithium-nickel-cobalt-aluminum (NCA) in with ni-cd and ni-mh?

 

yes, it is LiFePO4, part of the lithium-ion family.
And not only that, this is the most expensive high-power LiFePO4 cell that is both powerful and stable(safe).

Jack

 

I have understood that LiFePO4 is currently the most stable and safe member of the family. On the other end, lithium cobalt oxide is the most prone to events of this sort, near here Monday evening:
Flight to Seattle evacuated after passenger’s Samsung Galaxy phone ignites

(I don't see any confirmation of just which chemistry was involved in this particular incident.)

 

in rc models, we use lipo (lithium polymer) don't know if the chemistry is more specific than that, but you shouldn't leave them unattended when charging, and should be charged in non flammable surroundings.

 

That gives construction type, not chemistry. These are a subset of Li-ion.

Light weight is certainly desirable for RC airplanes. Just note that the chemistry most prone to spontaneous combustion, otherwise had a benefit of being among the lightest weight.

 

and packed with power to size as well

 

Couple of torture test for the certification, these are just a few test that have been captured with camera:

vertical puncture test:

horizontal puncture test:

24 hours overcharge test:

Short circuit test 1:

Short circuit test 2 - hydraulic press:

 

Southern state here. Battery seems to be holding up well with the heat. I will say I have been keeping my ac blowing colder than normal and did clean out the blower motor when I had it out. I do need to add a filter although I doubt it will help since the intake tube has some air leakage.

 

I just installed my lithium pack today. It only took a few hours. I have 198k miles and the NiMH pack was at 37% capacity. I feel like I have a new car. I was still getting 40 MPG, but I'm hoping to get 50+ now. My problem is I have too much lead in my right foot. Just realized I forgot to clean the fan while I was changing the pack. ARRRRGH.