NiMh Battery recommendations sought.

[Powerclocks]

Hi from OZ, My old Nimh pack on my iZip Trekking only charges to 24v max and is 2006 vintage, the cells are shagged.
I would like some advice, I am going to repack the banana shaped Battery, The battery pack is not serviceable, I can spot weld the Nickle metal strips and have all the equipment to do the job.

I took a look on eBay for batteries and Wish but I find the claims of storage capacity to be in some cases ludicrous, longevity is also important, has anyone bought from these sources to do a repack and can state a battery or a seller that sells batteries good for purpose, I have opened the pack and I presently have 20 x NiMh x D Cells @ 1.2v.

I will be staying with NiMh, Is there any way you can guide me to a product/seller? I dont mind doing the work but to go to all this trouble and have a less than adequate battery would be crappy, I hope for some good advice.

GJP

 

[gsm.terra]

Does this help? https://ebikemarketplace.com/blogs/news/izip-enlightened-e-bike-battery-cell-replacement

 

[vfr400]

35 of these @ 1.89 euros each is around £60, which will give 13Ah.

NKON | BG INR18650-26R 2600mAh - 12.5A - 18650 - Li-ion - Rechargeable batteries

.

eu.nkon.nl

A BMS for around £15 from Aliexpress. Add some ring insulators, card and the nickel strip (slotted) from Nkon, then this welder for £30 that my friend just had good success with, and that should complete the job for around £120.

color tree Portable Handheld Spot Welder Welding Soldering Machine for 18650/26650/32650 DIY Battery Assembly Nickel Tape 0.1-0.15mm : Amazon.co.uk: DIY & Tools

Shop color tree Portable Handheld Spot Welder Welding Soldering Machine for 18650/26650/32650 DIY Battery Assembly Nickel Tape 0.1-0.15mm. Free delivery on eligible orders of £20 or more.

www.amazon.co.uk

 

[flecc]

When we were still using NiMh, some of us used ready made packs from Batteryspace in the USA. Expensive these days, but convenient in various configurations of D cells to suit and only having to insert your existing NTC thermistor and connect up:

BatterySpace.com/AA Portable Power Corp. Tel: 510-525-2328

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www.batteryspace.com

.

 

[vfr400]

When we were still using NiMh, some of us used ready made packs from Batteryspace in the USA. Expensive these days, but convenient in various configurations of D cells to suit and only having to insert your existing NTC thermistor and connect up:

BatterySpace.com/AA Portable Power Corp. Tel: 510-525-2328

24 nimh battery pack,24 v battery,24 volt batteries,24 volt battery,24 volt battery nimh,24 volt battery pack,24 volt battery pack rechargeable, 24 volt battery packs,24 volt battery packs rechargeable,24 volt battery value pack,24 volt battery,24 volt nicad pack charger,24 volt nimh battery,24...

www.batteryspace.com

.

$260 for 10Ah plus god knows how much duty and shipping cost. It's going to work out much more than double the cost of Lithium for less capacity and double the weight. Nihm is old technology. It's had its day.

 

[WheezyRider]

Hi from OZ, My old Nimh pack on my iZip Trekking only charges to 24v max and is 2006 vintage, the cells are shagged.
I would like some advice, I am going to repack the banana shaped Battery, The battery pack is not serviceable, I can spot weld the Nickle metal strips and have all the equipment to do the job.

I took a look on eBay for batteries and Wish but I find the claims of storage capacity to be in some cases ludicrous, longevity is also important, has anyone bought from these sources to do a repack and can state a battery or a seller that sells batteries good for purpose, I have opened the pack and I presently have 20 x NiMh x D Cells @ 1.2v.

I will be staying with NiMh, Is there any way you can guide me to a product/seller? I dont mind doing the work but to go to all this trouble and have a less than adequate battery would be crappy, I hope for some good advice.

GJP

What are the reasons why you'd like to stick with NiMH?

 

[Nealh]

I have an old 24v Nimh pack in the garage 20 cells, not only bulky but quite heavy compared to Lithium. My 7s7p of Lg HE2's are lighter and has a max 140a discharge rate and 17.5ah of capacity about double that of the Nimh pack.

 

[WheezyRider]

I have an old 24v Nimh pack in the garage 20 cells, not only bulky but quite heavy compared to Lithium. My 7s7p of Lg HE2's are lighter and has a max 140a discharge rate and 17.5ah of capacity about double that of the Nimh pack.

Years ago I bought a whole load of 9Ah NiMH D cells. Still got them in the garage. At one point I had a go at trying to use them to replace the lead acid batteries in the Powabyke, but never got far with the project. They still took up loads of space and were only a little less heavy than the lead acid batteries.

For years I was sceptical about lithium batteries, I didn't like the idea of them blowing up and the need for special control circuits etc, but the technology has become so good now, I tried a lithium conversion on my main bike and then it was a nobrainer to do the same to the Powabyke.

NiMH are quite inefficient in charging compared to lithium cells and you need loads of them in series to get the voltage you want. Then, you won't have a BMS and so if you do have a cell in a string that is not working as well as the others, it will be destroyed over time and the pack will fail.