Forum Discussion
Gdetrailer
Sep 03, 2018Explorer III
Almot wrote:
Gdetrailer, few minor corrections if I may.
There are (many) Li batteries that come with BMS inside. Called "drop-in 12V battery replacement". You just drop it in place of an old battery.
Li have high initial cost, this doesn't make them more expensive because they have much longer cycle life than FLA - again, with proper care.
They are unforgiving to overcharging (95-99% is NOT recommended), over-discharging (avoid discharging below 30%), temps below freezing, temps over 100F, or too high current at the beginning of charging.
Recycling is a big point for those environmentally concerned. Li are so often toted as a part of "green" technology, promoters never mention the fact that Li can not be really recycled.
"Drop ins" typically DO have BMS built in which may make the transition easy, but at the same time BMS can and DOES fail. Typically when the electronics of the BMS fails it renders the battery 100% unusable instantly, this typically happens without any warning. You might simply have completed recharging and the next use the battery no longer has ANY voltage.
I HAVE had this happen, dealt with it in a custom designed device that my former company sold and it was my groups job to not only setup the device for the customers but to SERVICE the device in house.
Between Lithium battery failures, touch screen failures, WiFi radio card failures the product was sunsetted and withdrawn from the field after only 4 yrs (typical product cycle in that company was 10 yrs min from initial design to mature product and an additional 10 yrs to sunsetting.
Even had multiple customers experience battery meltdowns, damaging the unit and a couple of customers getting burned.
I have a DEEP respect for what high capacity batteries can do when mistreated OR when all the proper precautions (BMS) have been implemented and Mr Murphy puts a wrench into ones design and it malfunctions.
Most folks have NEVER, EVER seen the results that I have with Lithium technology when it FAILS, if they did they would not walk but run from them or at least treat these devices with some respect. They are not toys and in the wrong hands a fire cracker..
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