Thanks for the comment. Your reply was precisely what I thought the answer(s) would be.fechter wrote:It should be fine. The Ahr ratings for lead acid batteries are not very realistic under normal load conditions anyway. You might get slightly less range, but I don't see any other issues. It's probably more important that they fit physically and the terminals are in the right locations.
Sorry, but there are no data sheets for either the old batteries or the one's for sale, but thanks for your suggestion and the info as well.redilast wrote:Internal resistance is more important, because that generally dictates if the cell or battery can handle the same load as the other one. Some lead acid batteries used at heavy loads actually can have 1/2 their Ah capacity, its insane.
If there is a datasheet or something for the batteries try to compare the internal resistance between the 40Ah setup and the 35Ah setup.
Got it!.....Lower ah ratings, probably less lead and longevity (and range), and no batteries that aren't rated for EV's......Thanks so muchdogman dan wrote:As long as the new 35 ah cells are rated for EV use, it will be ok. Slightly less range, but generally a mobility scoot gets to recharge plenty often, and range is not a big issue.
Cheap batteries will be much lighter, thinner lead plates, and not able to recharge as many cycles. Look at weights, if the new batts are more than 5 ah worth lighter, then the lead is not in them. You do NOT want to buy a mower starter battery that weighs half what your old ones did.
You are correct. They should be deep cycle batteries. I am not buying them however, my neighbor is, so he'll have to decide what he's willing to pay.SlowCo wrote:If I'm correct you need deep cycle batteries for a mobility scooter. I don't know where you're located or what budget/price range your looking in but these seem reasonably priced:
https://www.amazon.com/Cycle-Battery-So ... deep+cycle
You know, this is a good point. I happen to have a three-wheeled (fast) mobility scooter myself, and I too will soon need to replace my four 12v 20ah batteries as well. The LifePo4 option is initially much more expensive, as you pointed out, but in the long run it may even be a bit less expensive. I'll certainly raise the option with my neighbor and let him see the costs of these types of batteries and chargers. I'm still a bit on the fence myself, but I'm definitely leaning towards the Lithiums for myself.Sunder wrote:Any reason why you wouldn't just buy a 24v 20Ah LiFePo4 battery? Just as safe, if not safer - no gassing, no acid, no chance of fire. You'd probably get just as much range, and it will last 4-10x more cycles for around double the cost. Hurts up front, but by the 2nd year, you'd appreciate not having degraded performance, and by the 3rd year, you'll appreciate not replacing them again.
Thanks for the info....Ykick wrote:SLA capacity ratings when used for EV purposes should be divided in half. In other words, 40Ah labelled SLA capacity is only about 20Ah in the real world. That's why someone mentioned going to Lithium 20Ah and it would deliver the same range as the original 40Ah SLA.
Or maybe a lot less expensive:Windmaker wrote:The LifePo4 option is initially much more expensive, as you pointed out, but in the long run it may even be a bit less expensive.
There's more. https://www.ebay.com/i/351864366128?rt=ncmarkz wrote:ebay link is gone now, but whatever it was sounds like a steal if they are decent. If you did not snag them, then maybe some Hobbyking LiPo's would do, I just looked and I see 10S (~37V) 4Ah $70usd. NKON has 4.20V 3Ah cans for $2.50, so say 10S3P nets you 42V 9Ah for $75. But then you'd have to tab weld or solder them.
Thanks for the suggestions....Dauntless wrote:There's more. https://www.ebay.com/i/351864366128?rt=ncmarkz wrote:ebay link is gone now, but whatever it was sounds like a steal if they are decent. If you did not snag them, then maybe some Hobbyking LiPo's would do, I just looked and I see 10S (~37V) 4Ah $70usd. NKON has 4.20V 3Ah cans for $2.50, so say 10S3P nets you 42V 9Ah for $75. But then you'd have to tab weld or solder them.
I wonder why these cost less. https://www.ebay.com/itm/NEW-Box-of-80- ... 1987482937
Just remember you have a bit of a challenge putting it together.
Thanks for the recommendation, but your instructions are way over my head.999zip999 wrote:Make a battery out of leaf modules. Professionally made in steel case you just got to recreate some wires inside and still use the metal cases maybe four of them. I think they are 2s 2p and you just cut a couple wires and reroute them and you'll be able to have a 35 amp hour 14 volt battery. I think ? There are articles on Leaf modules and people doing them here on E.S.
Wonder want is the controllers range hvc and lvc. As sla 48volt is 54.4v and what 47volt or sagging sla 45volt ? Or does it have lvc ?
Or some other used option ? Do ditch the lead if money possible.