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Discussion Starter #1 (Edited)
Hello all, it was suggested by another user that I post the Ni-Mh batteries that I have here. I have a lot, a whole lot... they are in 6 D cell sticks at 7.2 volts 6500mAh. I have several thousand of them. They were used only a few times and then removed from their original electronic device. I am selling any quantity all or just a couple hundred! Any help on who could use these would be great as well!

Thanks!
Mike




 

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Hello all, it was suggested by another user that I post the Ni-Mh batteries that I have here. I have a lot, a whole lot... they are in 6 D cell sticks at 7.2 volts 6500mAh. I have several thousand of them. They were used only a few times and then removed from their original electronic device. I am selling any quantity all or just a couple hundred! Any help on who could use these would be great as well!
Mike, do you have data sheets on these?
 

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Discussion Starter #3
Re: Data Sheets

I do not, however if you let me know what information you need I would be happy to find it and post it for everyone to see.
Thanks,
-Mike
 

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I would like to know the following:

#1>
6 cell stick total internal resistance.

#2>
6 cell stick charge rates for 1,000+ cycle life.

#3>
6 cell stick discharge rates for 1,000+ cycle life.

#4>
Need to know the Depth of Discharge & / or SoC tolerance ( in Ah or %SoC ) for 1,000+ cycle life.

#5>
Self Discharge rate

#6>
Total net weight of a 6 cell stick.

#7>
The dimensions of the 6 cell stick.

#8>
The Cost per Stick.

#9>
What was the product that they came from / were designed for?
 

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Discussion Starter #6
Specs are as follows:

1、 SCOPE
This specification governs the performance of the following Nickel-Metal Hydride
cylindrical cell and its stack-up battery.

Cell Size: Dcusp(32.1±0.1×60.5±0.5)mm
Dcrew cut(32.1±0.1×59.0±0.5)mm
2 、DATA OF STACK UP BATTERIES
All data involve voltage and weight of stack-up batteries are equal to the value of unit cell
multiplied by the number of unit cell which consisted in the stack-up batteries
Example :Stack-up batteries consisting three unit cells
Nominal voltage of unit cell=1.2V
Nominal voltage of stack-up batteries =1.2V×3=3.6V
3、 RATINGS

Description Unit Specification Condition
Nominal Voltage V/cell 1.2 Unit cell or stack-up batteries
Minimum Capacity mAh 9000 Standard Charge/Discharge
Nominal Capacity mAh 9000 Standard Charge/Discharge
Standard Charge mA 900 (0.1C) T1=20±5℃(See Note 1)
hour 14~16
Fast Charge mA 2700 (0.3C) -ΔV=0~5mV/cell , Timer Cutoff=120%nominal capacity , Temp.Cutoff=55℃, dT/dt=0.8℃/min,T1=20±5℃
hour 4 approx
(See Note 2)

Trickle Charge mA (0.03C)~(0.05C) T1=20±5℃
Standard discharge mA 1800 (0.2C) T1= 20±5℃ Humidity:Max.85%
Discharge Cut-off Voltage V/cell 1.0

Storage Temperature ℃ -20~25 Within 1 year* State:30% charge , Max Humidity:85%
-20~35 Within 6 months
-20~45 Within 1 month
-20~55 Within 1 week
Typical Weight Gram 158.0 unit cell
*To keep the best performance for those not used for a long time,we recommend to charge the
cells/batteries at least 30% after discharge entirely in every 6 months.

Document Title:Product Specification of Ni-MH 9000
4、 PERFORMANCE
Unless otherwise stated, tests should be done within one month of delivery under the
following conditions:
Ambient Temperature :20±5℃
Relative Humidity : 65±20%
Notes: Standard Charge/Discharge conditions:
Charge: 900 mA(0.1C)× 14 hours
Discharge: 1800 mA(0.2C) to 1.0V/cell
Test Unit Specification Condition Remarks
Capacity mAh ≥ 9000 Standard Charge/ Discharge up to 3 cycles are allowed

Open Circuit Voltage(OCV) V ≥ 1.25 Within l hour after standard charge

Internal Impedance mΩ ≤ 9 Upon fully charged(lKHz)
High Rate Discharge(1C) min ≥ 51 Standard Charge, l hour rest before discharge by 1C to 1.0V/cell up to 3 cycles are allowed


Charge Retention mAh ≥ 5400 (60%) Standard Charge,Storage:28 days Standard Discharge T1=20±5℃

IEC Cycle Life Cycle ≥500 IEC61951-2(2003)7.4.1.1 see Note 3
Leakage No leakage nor deformation Fully charged at : 900 mA for 48 hrs

Vibration Resistance Change of voltage should be less than 0.02V/cell,Change of impedance should be less than 5 milli-ohm/cell Charge the battery at 0.1C for 14hrs,then leave for 24hrs,check battery before/after vibration,amplitude 1.5mm,vibration 3000 CPM,any direction for 60mins.

Impact Resistance Change of voltage should be less than 0.02V/cell,change of impedance should be less than 5 milli-ohm/cell Charge the battery at 0.1C for 14hrs,then leave for 24hrs,check battery before/after dropped,height 50 cm wooden board(thickness 30mm)direction not specified,3 times.
Specification
Nominal Capacity 9000 mAh
Nominal Voltage 1.2 V
Charge current Standard 900 mA
Fast 2700 mA
Charge time Standard 14~16 Hrs
Fast 4 Hrs
Ambient Temperature Charge Standard 0℃~45℃
Fast 10℃~45℃
Discharge -20℃~60℃
Storage -20℃~55℃
Internal Impedance(mΩ) (After Charge) ≤ 9

Weight 158.0 g


Unfortunately I don't have a brand or a model number unless it is contained in the specs above and I missed it. This is all the information that I can get, if someone is having difficulty reading it please respond with your email address and I will send the file in spreadsheet format.

Thank you all for your interest.
 

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Ian,

I'm seeing a 3C charge being quoted there, but I don't know if it is the max charge it will take. Insight sticks charge at up to 15C and discharge at up to 7C.

Am I reading it right?
 

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Definitely not wired for high discharge. Based on individual cell weight 1 pack would weigh 36 lbs plus packaging. Sounds like they are less dense than stock Insight (Panasonic) batteries.
 

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Ian,

I'm seeing a 3C charge being quoted there, but I don't know if it is the max charge it will take. Insight sticks charge at up to 15C and discharge at up to 7C.

Am I reading it right?
no .. its 0.3C charge rate ... commonly written as ~C/3 .... a 2,700 mA Fast charge rate on a 9,000 mAh rated cell.

The OEM IMA NiMH Cells charge at rates up to 7C ( ~50A ) ... and Discharge at up to 15C ( ~100A ) rates.

These cells do not seem to be designed for high power density ... like the OEM Insight cells are.

They do not seem to be the newer version of the LSD NiMH cells.

Given that they are rated at 9Ah for a 'D' cell size ... I would not say they are at the peak of energy density either ... over 4 years ago I could buy 12Ah 'D' cells...

Discharge is referenced as ~9,000 mAh at 0.2C or C/5 'Standard' discharge rate... and ~51 Min run time at a 1C discharge rate ... which would be ~9Amps ... and in ~51 Minutes would yield a usable ~7.65Ah when discharged at a 1C rate ... if we continue to loose this ~15% of the capacity when we go from 1.8 Amp rates to 9 Amp discharge rates ... remember energy loss in a battery with increasing current rates is not linear ... as Peukert showed long ago ... it tends to follow a more exponential curve ... I would expect to get less than ~5Ah of usable battery capacity discharging these cells at a ~27 Amp rate ...

----------

So if you want a set of batteries for something else ... they might work just fine ... but they do not have the power density needed for Insight / Civic replacement sticks.

And I would say they would have to be sold for less than the ~$7 per cell ( under $40 per 6 cell stick ) ... you can buy 10Ah 'D' cells for under ~$7 per cell pretty easily and just make your own 6 cell series sticks.... you can buy ~12Ah 'D' cells for under $8 per cell and make your own... unless you just want to pay for the convenience of having it already made for you.

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Remember not all Batteries even of the same chemistry are made for the same roles ... the Insight / Civic cells are designed for Power density ... and they do this at the cost of a loss in energy density ... no battery on the market gets both ... it is always a trade ... to get more energy density ... or more power density ... you have to loose a bit of the other.

These cells at 9Ah hold significantly more energy than the ~6.5Ah of a brand new Insight / Civic cell ... but only when discharged at slower ~9Amp or less rates.
 

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Hello all, it was suggested by another user that I post the Ni-Mh batteries that I have here. I have a lot, a whole lot... they are in 6 D cell sticks at 7.2 volts 6500mAh. I have several thousand of them. They were used only a few times and then removed from their original electronic device. I am selling any quantity all or just a couple hundred! Any help on who could use these would be great as well!

Thanks!
Mike
813-464-5600





Mike, I think I will try for an alternate power source for my Roomba(2 sticks)
 

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Discussion Starter #11
Any great ideas???

Anyone have any good suggestions as to where these would be applicable in the mass quantities that I have?

I sure would appreciate it,
Mike
 

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They have less Wh / kg than Li or modern NiMH ... so I would avoid trying to compete with either of those.

Even though they are not 'modern' NiMH cells ... they are still better energy to weight ratio than PbA is... but most people who go with PbA do it for the low $ / wh cost... which would not offer you much profit margin if you try to under cut the $ / Wh of PbA... but if you did want to... you could try and compete in places where PbA is now... although most PbA come as 12V not 7.2V ... so you would be looking for hobbiest / DIY types.

The sticks are in the middle ... better than PbA ... but not as good as 'modern' NiMH or Li... so that one element of your target market.... people who want better than PbA but are not ready to eat the high cost of Li, and want a middle ground option.... you have that middle ground option... you just need to price it and market it accordingly.

For Example:

Some E-Bikes might like this option ... but most would probably want the sticks pre-wired into packs for 24V , or 36V , or 48 V.... which are the most common 3 Voltages for E-Bike battery packs... if you price them near the price level of similar Ah PbA battery packs... you might get some bites in those circles.

For Instance current market price for a pre-made 7.2V NiMH battery pack rated at 10Ah is ~$90+Shipping... yours have less Ah ... so you would have to charge less in order to be considered... currently on the market for a pre-made 7.2V NiMH ~4Ah battery pack is is ~$28+Shipping ... you have more Ah than that so you might be able to get more than that.

So that is your price range ... you should be able to get more than ~$35 per stick... but less than ~$80 per stick... then you have to market your product to the right target customers.

Best of luck.
 
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