A couple different questions (SLA batteries and thermal exp)

[Sid]

Ok, so I was reading about which battery to get, and I read somewhere that an SLA rated at 10 AH will only provide about half of what a 10 AH Li-Ion would. Is this true?

Also, ebikes.ca sell triangular packs that would fit in my frame, but it would JUST BARELY fit in my frame (like, I wouldn't even have to tie it in it's so tight). Would I have to worry about thermal expansion with these, or would the cells expand in length instead of circumference?

 

[deardancer3]

Ok, so I was reading about which battery to get, and I read somewhere that an SLA rated at 10 AH will only provide about half of what a 10 AH Li-Ion would. Is this true?

?

Yes, part one is true for several reasons;
discharging at a high current rate really decreases the number of amhours available per charge, and,

discharging significantly below 50% depth of available charge shortens the number of battery cycles available before replacement time.

On your other question, no data here.

d

 

[dogman dan]

Yes, the sla's will only be able to provide about half the stated ah due to peukerts effect, or voltage sag at higher discharge rates. At a much lower rate of discharge, the sla will deliver all its ah. Carrying enough sla's to minimize this effect is not very practical due to weight. On a 24v bike, carrying two pairs of sla batteries is not so bad. I have done it, and it really helps with the range due to less voltage sag.

On the other, ask the guys at ebikes-ca. I really like the nicads I got from them. I bought a pair of 24v, and now carry them in small panniers series connected on 48v bike. Shoulda got two chargers though. Maybe one in the triangle and one on a rear rack? Or even a 24v and a 36v for 60v ?