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Battery DIY replacement.

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Riejufixing
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PostPosted: 14:50 - 05 Aug 2019    Post subject: Battery DIY replacement. Reply with quote

Has anyone replaced their own battery? I need to replace a 36V 10AH batteri in a tricycle, and I'm wondering whether or not to go for 3x12v lead acids, or try to build a Li-ion one from 18650s. What's in at the moment is those cells-in-bags which are considerably bulged, and U/S.
Weight... cost... issues...
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GettinBetter
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Joined: 20 Jun 2019
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PostPosted: 22:19 - 04 Jan 2020    Post subject: Reply with quote

Is this all done & dusted now, if so what did you do?
I replaced my lead acids with lithium ions, but won't bore you with the details if you've sorted it.
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Riejufixing
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PostPosted: 22:43 - 04 Jan 2020    Post subject: Reply with quote

GettinBetter wrote:
Is this all done & dusted now, if so what did you do?
I replaced my lead acids with lithium ions, but won't bore you with the details if you've sorted it.

No. The poxy thing's still blocking up my wood workshop, which I can hardly get into because of stuff like that. The battery is outside in case it "does something". The cells in it aren't 18650s, they're flat (well, supposedly flat) things "in bags".
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Easy-X
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PostPosted: 04:07 - 05 Jan 2020    Post subject: Reply with quote

Sounds like Lithium Polymer batteries.

I build batteries for ebikes. Is that the sort of thing you're after?
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GettinBetter
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PostPosted: 10:32 - 05 Jan 2020    Post subject: Reply with quote

Riejufixing wrote:

No. The poxy thing's still blocking up my wood workshop, which I can hardly get into because of stuff like that. The battery is outside in case it "does something". The cells in it aren't 18650s, they're flat (well, supposedly flat) things "in bags".


My original lead acids were 12kgs, the lithium replacement was 7kgs, with the same capacity, but at 48V. I wouldn't choose the lead acid route

Ok, if Easy-X is correct you already have lion batteries... we have questions, which'll save loads of posts.
1. What make of tricycle.
2. Factory fitted electrics or retro/DIY.
3. Power of the motor.
4. Part Number of existing 'bags', and confirm quantity.
5. Declared voltage & mAh output, (the Chinese seem to be in a badge engineering war with fictitious capacities).
6. Photos would really help.

Cool
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Easy-X
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PostPosted: 12:03 - 05 Jan 2020    Post subject: Reply with quote

TBH you don't even need all that. Just give us the spec of the motor(s) i.e. expected voltage and maximum power output.

For example, if the motor is "36V, 250W" one would need to account for a surge of ~400W....

I make 18650 battery packs and for such a motor I would use 10 batteries in series and 3 or 4 in parallel. (More in parallel = more capacity both for range and maximum power output.)

I spot weld the batteries together with nickel strips and then solder on a BMS PCB (battery management system) and then it's just a case of packaging.
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GettinBetter
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PostPosted: 12:35 - 05 Jan 2020    Post subject: Reply with quote

Easy-X wrote:
...

I make 18650 battery packs and for such a motor I would use 10 batteries in series and 3 or 4 in parallel. (More in parallel = more capacity both for range and maximum power output.)

I spot weld the batteries together with nickel strips and then solder on a BMS PCB (battery management system) and then it's just a case of packaging.


Nice... have you got any pics of your batteries? really interested in the spot welding.
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