They are the same size as the 40's but x2+ the money. Do they really get the number of cycles they advertise and would it be safe to use them in my chair???
Max. Continue Discharge Current: 50A
wes4dbt wrote:Thanks for the replies, here is the link
https://www.walmart.com/ip/ExpertPower- ... lsrc=aw.ds
Again what chair is it? Because this is too low for any normal powerchair.
those wont do much for you over lead - its only 50ah - thats about what you get with lead - not worth it - they may last more than a few years maybe - but your wasting your money with that
When charging at above-freezing temperatures, the lithium ions inside the battery are soaked up as in a sponge by the porous graphite that makes up the anode, the negative terminal of the battery. Below freezing, however, the lithium ions aren’t efficiently captured by the anode. Instead, many lithium ions coat the surface of the anode, a process called lithium plating, which means there’s less lithium available to cause the flow of electricity and the battery’s capacity drops. Charging below 0°C at an inappropriate charge rate, also causes the battery to become less mechanically stable and more prone to sudden failure.
The damage to the battery when charging at colder temperatures is proportional to the charging rate. Charging at a much slower rate can reduce the damage, but this is rarely a practical solution. In most cases, if a lithium-ion battery is charged below freezing even once, it will be permanently damaged and must be safely discarded or recycled.
Thanks for the explanation, not what I wanted to here but that's ok. I'm curious how you found out my chair can draw 70a per side.
Let me ask, if I found a Lithium battery with a 70a discard rate, that fit my battery space, would I be able to just drop them in and go??? Would it require a different charger? From what you guys have said it doesn't sound like a simple swap out is possible.
I'm not ready to tackle building my own setup yet, just put these MK 40's in, so I got a while to think about it. I would be interested if you know of a good tutorial for a beginner like me.
But you are already shortening their ives by using a nasty mobility charger. They are gel. They must be charged with a charger that never exceeds 14.1V per battery or 28.2V max for both. And they need to sit at that voltage (at 20 Centigrade) for 8 to 12 hours. Followed by 16 hours at FLOAT voltage of 13.4 to 13.5 (27.0V max) afterwards. For a COMPLETE charge. If not then you are killing them fast! And all mobility chargers do at least one of those things wrong! But thats another thread. Ask if you care!
Cycle 13.8 - 14.6 volts
Float 13.4 - 13.6 volts
If you do what most mobility chargers do, and discharge them heavily as you were doing, you will get a few months use and crap range. I tell people this for 23 years and nobody listens!
If your chair comes with a 5a charger is it safe to use a 8a or higher??? I've always worried that you might burn out the wiring or it might ruin the batteries. If I could use a 8a charger that probably would help.
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