rebelrider.mike
Member
- Joined
- May 25, 2017
- Messages
- 554
Hi folks,
I've no plans for a power wall, but I've started harvesting 18650s to start building various battery packs for a variety of projects. I've only just started and I don't have any fully tested cells to add to the Big List yet, but I've got more equipment on order and I hope to start contributing soon. Here's a few ideas I have in mind:
Electric bike conversion.
Replacement battery for a lawn mower starter.
Onboard battery for an electric mower previously powered directly from the wall outlet.
Replacement batteries for various aging NiCd battery packs.
Portable charger for cell phones, etc...
And in the distant future, maybe even an electric conversion of a 1981 Honda Civic... maybe.
I found my way hear after watching Jehu and HBPowerwall doing their various experiments. Initially, I only wanted to know more about the capabilities and limitations of lithium ion batteries since I recently bought a few. Since then though, I've found the whole 18650 harvesting and reuse thing fascinating. So Washington has a kind of progressive reputation, but I happen to live in The County That Time Forgot. Folks here barely know about recycling anything and I'm pretty sure I'm the only person in town who wants old laptop batteries. Which is great for me as I have 3 computer repair shops and 1 e-waste recycler willing to give me old batteries for free!
I've got roughly 150 cells so far to test. One obviously dead/vented, and 34 have accepted a 3.8v storage charge and seem to be holding ok. I'll see what the mAh are once the tester arrives. I don't know about measuring internal resistance.
Here's a couple questions:
I know how to measure it, but I don't know how to interpret the numbers. I've watched many You Tubes about it, but none seem to be able to come to a conclusion as to what is good or bad. Maybe just use it to pair up cells with similar resistances?
Also, is there a consensus on constant and peak Amps for each of these old cells? Peak being say, 6 seconds or so for maybe 3 times before resting the battery a while? I'm thinking 1A constant and 4A peak would be fairly reasonable, but that's just my noob assumption.
I've no plans for a power wall, but I've started harvesting 18650s to start building various battery packs for a variety of projects. I've only just started and I don't have any fully tested cells to add to the Big List yet, but I've got more equipment on order and I hope to start contributing soon. Here's a few ideas I have in mind:
Electric bike conversion.
Replacement battery for a lawn mower starter.
Onboard battery for an electric mower previously powered directly from the wall outlet.
Replacement batteries for various aging NiCd battery packs.
Portable charger for cell phones, etc...
And in the distant future, maybe even an electric conversion of a 1981 Honda Civic... maybe.
I found my way hear after watching Jehu and HBPowerwall doing their various experiments. Initially, I only wanted to know more about the capabilities and limitations of lithium ion batteries since I recently bought a few. Since then though, I've found the whole 18650 harvesting and reuse thing fascinating. So Washington has a kind of progressive reputation, but I happen to live in The County That Time Forgot. Folks here barely know about recycling anything and I'm pretty sure I'm the only person in town who wants old laptop batteries. Which is great for me as I have 3 computer repair shops and 1 e-waste recycler willing to give me old batteries for free!
I've got roughly 150 cells so far to test. One obviously dead/vented, and 34 have accepted a 3.8v storage charge and seem to be holding ok. I'll see what the mAh are once the tester arrives. I don't know about measuring internal resistance.
Here's a couple questions:
I know how to measure it, but I don't know how to interpret the numbers. I've watched many You Tubes about it, but none seem to be able to come to a conclusion as to what is good or bad. Maybe just use it to pair up cells with similar resistances?
Also, is there a consensus on constant and peak Amps for each of these old cells? Peak being say, 6 seconds or so for maybe 3 times before resting the battery a while? I'm thinking 1A constant and 4A peak would be fairly reasonable, but that's just my noob assumption.
