trying this again. would like to get running and possibly upgrade an old 24v EVG ebike my wife was given. will start with SLA’s as designed but am interested in upgrading to Li for less weight and better range if she likes it. anyone have details/instructions on how to accomplish this?
hello. need help with a 24v EVG ebike
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Dewey
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Can you provide photos & model #?
Ought to be fairly simple to identify the power wires (red & black) coming out of the battery pack, cut them and crimp on Anderson connectors to match Andersons for your new 24v battery pack. I use Grin Tech to supply the connectors and their crimping tool. Do you have a replacement battery pack in mind?
Ought to be fairly simple to identify the power wires (red & black) coming out of the battery pack, cut them and crimp on Anderson connectors to match Andersons for your new 24v battery pack. I use Grin Tech to supply the connectors and their crimping tool. Do you have a replacement battery pack in mind?
JRA
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Thought I answered this yesterday but you can source 24v Lithium batteries made for tools from Kobalt and Flex and perhaps others. Using a product like this should make the retrofit easy.
pics attached. don’t see a model # on it anywhere. think it’s just a ’EVG 24v ebike’. the battery pack does have a model# and serial#.
don’t have any batteries in mind. any recommendations? would like to find something that fits within the existing battery pack case. (currently houses 2 BSL1104 12v 12Ah SLA’s approximately 6”x4”x4”.)
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Slaphappygamer
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Yes.
I have the black version of this bike. I was actually looking at maybe a hailong battery, or shark type battery may fit in that same spot.
Just above the bottom bracket, there are old springy posts that the old battery connects to. You can remove the whole plastic “plate”. There will be eye type terminals that you can unscrew and attach another battery source, like a drill battery. You can even get a 24v lithium battery with XT60 connectors and wire up a similar end to the terminals on the “plate”.
PS, You don’t need to have the original battery and case. You’ll actually have more room for a lithium battery without it.
I have the black version of this bike. I was actually looking at maybe a hailong battery, or shark type battery may fit in that same spot.
Just above the bottom bracket, there are old springy posts that the old battery connects to. You can remove the whole plastic “plate”. There will be eye type terminals that you can unscrew and attach another battery source, like a drill battery. You can even get a 24v lithium battery with XT60 connectors and wire up a similar end to the terminals on the “plate”.
PS, You don’t need to have the original battery and case. You’ll actually have more room for a lithium battery without it.
24V ‘tool batteries’ i’ve found are only 4Ah. bike came with 2 12V 12Ah SLA batteries i found these 2 batteries on amazon. the 10Ah would fit in the existing case. the 20Ah won’t.
i can certainly make the larger one work by not using the existing case, removing the connector plate and wiring as you mention. my wife won’t be riding very far on any trip - maybe 4-5 miles tops. and the terrain is virtually flat. so i’m hoping the 10Ah will meet her needs. but if the 20Ah will work with no problems of probably opt for it just so i don’t have to upgrade again if she wants longer rides. both are rated for 100-500 watt motor and the EVG is 400 so good there. if she loves riding an ebike and wants to z really extend her range i’ll get her a newer bike. just didn’t want to dump a couple $k to learn she doesn’t like it. so when she was offered the EVG for free i jumped on it.
electronics not my strong suit so i’m wondering if the 29.4 spec of battery will be a problem. or the 20.3 cut out voltage. don’t want to burn out the motor in use! planning to use the charger that comes with the battery external to the bike for recharging it.
any other thoughts or insights or things to worry about?
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Slaphappygamer
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SLA batteries are rated over a 20 hour period. So a 12ah Sla battery will produce 12 amps over a 20 hour period. 20/12=1.6. That is, a 12ah Sla battery will deliver 1.6 amps per hour. Lithium battery amp hours are rated over a 1 hour period, so even a 4ah lithium battery will last longer than a 12ah Sla battery.
Um, really? FIrst time I've heard of this. Can you give a reference?
Amps is a rate of flow, like gallons per minute. Saying that 12amps over 20 hours is 1.6 amps per hour does not compute for me. Amps don't add up that way. Coulombs do.
I believe a rating of, say, 100AH implies the battery can supply 10A for 10 hours or 20A for 5 hours. Now, some references say SLA battery capacity sags at higher current, meaning that maybe a battery that lasts 10 hours at 10A will only last 3 hours at 20A. Lithium batteries don't sag as much, so that is a mechanism whereby an Li battery might outperform an SLA battery with a higher rating. It would depend on details of batteries and current draw.
Slaphappygamer
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A couple of articles that can explain better than I can.
support.rollsbattery.com
www.mrpositive.co.nz
What is Amp Hour Capacity?
The following information has been sourced via: http://all-about-lead-acid-batteries.capnfatz.com/all-about-lead-acid-batteries/lead-acid-battery-fundamentals/what-are-amp-hours/ Amp Hour Capacity The Amp Hour (AH) specification provides a m...
support.rollsbattery.com
Lead Acid Battery Ratings | What Are Lead Acid Ratings
What do all the ratings on lead acid batteries mean. CCA, CA, MCA, PHCA. Visit Mr Positive for more info.
www.mrpositive.co.nz
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Good articles, and I think you and I agree. I got confused over some of the units in post #9. I think where you said "will produce 12 amps over a 20 hour period" it would be better to say "will produce 12 ah over a 20 hour period" Also, "1.6 amps per hour" should be "1.6 amps for 20 hours"A couple of articles that can explain better than I can.
What is Amp Hour Capacity?
The following information has been sourced via: http://all-about-lead-acid-batteries.capnfatz.com/all-about-lead-acid-batteries/lead-acid-battery-fundamentals/what-are-amp-hours/ Amp Hour Capacity The Amp Hour (AH) specification provides a m...
Lead Acid Battery Ratings | What Are Lead Acid Ratings
What do all the ratings on lead acid batteries mean. CCA, CA, MCA, PHCA. Visit Mr Positive for more info.
I'm glad to know about the way SLA and Lithium differ in ability to deliver current. Cheers!
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