For BFL13 et al... FLA vs AGM vs Li vs heated Li

pianotuna wrote:
Hi,

I got that from one of the sellers pages. Heat and Li don't party well together.

Here it is with the source:

"To sum up, for long and happy LFP battery life, in order of importance, you should be mindful of the following:

Keep the battery temperature under 45 C (113 f) (under 30C if possible (86 f)) – This is by far the most important!

Keep charge and discharge currents under 0.5C (0.2C preferred)

Keep battery temperature above 0 C (32 f) when discharging if possible – This, and everything below, is nowhere near as important as the first two

Do not cycle below 10% – 15% SOC unless you really need to

Do not float the battery at 100% SOC if possible

Do not charge to 100% SOC if you do not need it"

The above are from https://www.solacity.com/how-to-keep-lifepo4-lithium-ion-batteries-happy/

I would find a different place to read from. to me that sounds liek either they havent got a clue wht there talking about and just going off old info from different types of LI or that there just trying to pad there side against warenty issues. every LiFepo4 cell that I have looked up in the last few days stated 60 or 65C as the max operating temp, which is pretty much the same for SiO2. the charge rate isnt reay an issue as not many people in the rv industry are ever going to hit 1C and even so the manufactures all state 5 to 7C as the max charge rate (but the ceviate is the internal temp of the battery.) if it startes getting to hot you have to slow down the charge, but when people build them they put in 1C bms limitations to be safe. they are floated all the time at 100 percent in power backup roles, but if you are worried about it the BMs sets charg and discharge cutoffs so that should be taken care of by the person who puts the battery togeather so no issues. as for the 10 to 15% thing I wont even go there as it is complete bunk, the life is an average of 4000 cycles at 100% depth of cycles. so if you stay at that 10% as a bottom floor you will probabaly extend it to 6000 cycles, but how long is 4000 cycles. my Lead acid batteries are only 800 cycles and they have lasted me 14 years now as I don't do deep cycles so I extended there life but lets say you camp 15 weekends a year (optomistic for most of canada haha) and you cycle once each weekend thats still 266 years of camping so lets say you do 52 cycles a year , thats still 76 years worth of cycles. lets say its a bad batch of batteries and you only get 2000 cycles now we are down to 38 years...

In all likly hood I would only drop down to 14% at anypoing as that is where the voltage drops below 12.5ish. but most of the built batteries are made so there i actualy more capacity than what they are selling, I believe a 100ah battle bourn is actualy an 120 AH build and the BMS is set to limit top and bottom charging and discharges so you end up with a 100% usable advertised capacity with out worring about dammage. they also have temprature compensated charging through the BMS.

I am always sceptic when I see a company that assembles batteries (and most probably dont even do that, they get get the manufacture to slap there sticker on them and resell.) put stuff like this on there website. we have a few here that do that also. they know people wont spend the money on average so they make them sound great but finiky at the same time.

Steve