Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Battery capacity ?
#1
I am a new member and harvesting cells 18650’s for an ebike aux. Battery . 52 V. 15 amp.
Does anyone know the capacity of this 3.7 li-ion cell?
“RHYA45 HS1865 -A Li-ion
ICNMR19/66 Date code 120718”. grey sleeve with black Positive insulator ring on top.

Thanks ,
Jay Gelber
Reply
#2
First, welcome
Second, Check the Cell Database
Third, only *you* can tell what the actual capacity is by charging it to 4.2V, then discharge at a specific current over time till it reaches about 3.2V.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at Discord Chat (channels: general, 3d-printing, linux&coding, 18650, humor, ...)
(this chat is not directly affiliated with SecondLifeStorage; VALID email req'd)
Reply
#3
To start your 18650 journey, three key devices are recommended:
- a multimeter
- a charger that can measure capacity for you eg Opus BT3100 v2 (and others) (automatically test capacity)
- a meter to measure the cells internal resistance "IR" eg a YR1030 (and others) (quickly find bad cells before even starting to charge)
100kwh-hunter likes this post
Running off solar, DIY & electronics fan :-)
Reply
#4
To determine what capacity they should have is pretty easy.

You have the 15Ah spec.

Divide that by the number of cells in parallel (like 5 or how many they are) and you have the rating of a single cell.

5 parallels at 15Ah means 3000mAh per cell. More in parallel, less mAh/cell.
Reply
#5
Opus is always first mentioned but a more economical choice is Litokala tester which does a good job for less money. Anyone have experience with some of the 8-place testers here and here that are coming out?
Reply
#6
Liitokala is not generally more cost effective and it lack some functions. Its cheaper due to some reasons...


Lii is only 500mA and Opus is 1A. 1A tests a cell better in terms of overall performance and their life
Testing in 1A also takes half the time so you basically test 2x as many cells with the opus.

So whats most costeffective was cheapest are 2 things Smile
NOTE! My links supplied in this message may be affiliated with Ebay and by clicking on them you agree on the terms.
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 100kWh LiFePo4 | 20kWh 14s 18650 |  66*260W Poly | ABB S3 and S5 Trip breakers
Upcoming: 14S 18650~30kWh
Reply
#7
My Litokalas are all 1 amp and I'm not sure what functions you are referring to. Charge, discharge, IR and full cycle and report are there. Hmm...... It's been all I've needed. In fact one of mine now has leads with alligator clips soldered on to the motherboard for cycling prismatics. A very easy modification. I expected IR to go crazy with the leads. Not so much.
Reply
#8
(08-31-2020, 12:38 AM)Jay Gelber Wrote: I am a new member and harvesting cells 18650’s for an ebike aux.  Battery . 52 V. 15 amp.
Does anyone know the capacity of this 3.7 li-ion cell?
“RHYA45 HS1865 -A Li-ion
ICNMR19/66 Date code 120718”.  grey sleeve with black Positive insulator ring on top.

Thanks ,
Jay Gelber
Question:

The battery is 52V?
If that is the case and the cells are 3.7 nominal then it must be 14s.
Is the pack rated at 15A or 15Ah?
How many cells in parallel?
Do they look like this except they are gray?

Wolf
For Info Google Drive

Great ABB shunt breaker seller River City Industrial
Great prices and superb service.
 [Image: em2566%20(1)__19172.1521541365.jpg?c=2]

Not your average Wolf       
            Cool
Reply
#9
Diggsut when doing 4 cells its only 0.5A during discharge. The lack of function i talk about is the stresstest. The Lii have lower current during a cycle test and therefore i call it lack of function Smile

You can ignore the IR test on those testers. They can vary 100% or more easily and are pretty of from the start. Get a 4-wire tester instead. Smile
NOTE! My links supplied in this message may be affiliated with Ebay and by clicking on them you agree on the terms.
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 100kWh LiFePo4 | 20kWh 14s 18650 |  66*260W Poly | ABB S3 and S5 Trip breakers
Upcoming: 14S 18650~30kWh
Reply
#10
^^^ Some chargers support parallel discharging, so you can hook a single battery to all 4 slots to get 4x the max discharge rate (e.g. the Opus CT-3100 supports this - see here and here).  If the Liitokala also supports this then you could get 2A max on one cell. But be careful testing for support since it could possibly damage the charger.
Reply


Forum Jump:


Users browsing this thread: 1 Guest(s)