Need Help Selecting Battery for TSDZ2 36V 350W

Batteries, Chargers, and Battery Management Systems.
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Jpcowan37
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Need Help Selecting Battery for TSDZ2 36V 350W

Post by Jpcowan37 » Tue Nov 07, 2017 3:04 pm

Hello everyone, first time poster here.

I recently ordered a TSDZ2 mid-drive kit to convert my Cannondale mountain bike. I ordered the 36V 350W version.

My problem: Trying to find a compatible battery pack seems like a huge headache. I've spent hours looking on amazon, ebay and various ebike company websites, as well as reading forum posts here that came up in google, and I am still thoroughly confused. At the risk of sounding hyperbolic, it almost seems like I'd need to take a semester in electrical engineering to make the right choice at this point...

I know that I need a 36V battery, and that I probably don't want to get it from China. I also know that I probably do not want to get Li-Po, due to safety concerns. But I've seen totally opposite information from different sources about what other chemistry is best; some say that LiFePo4 is long lasting, but I've seen other sources say that it has a shorter life cycle than others. What gives??

Anyway, I'm mainly confused about the connecting cord for the battery. It seems like very few kits or batteries give the name of what type of connection type they use. Every time I try to research this it just seems like I'm running around in circles. If I get a battery with the wrong type of cord, do I have to do electrical work and risk frying the battery? I know its generally advisable to get everything from the same source, but I could only find the Tongsheng kit from a Chinese supplier and have heard bad things about getting batteries from China. I would like to find a battery in the 10-20 Ah range, depending on price. The kit is expected to arrive by Nov 28th, so I'm hoping to find a battery that will arrive by then.

I hope I provided the right amount of information. Can someone please guide me in the right direction and help ease my confusion? Am I just massively overthinking this?

docw009
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Re: Need Help Selecting Battery for TSDZ2 36V 350W

Post by docw009 » Tue Nov 07, 2017 9:35 pm

As you have discovered, letting the connector dictate your choice of battery makes no sense,

Builders do not worry about what power connectors, if any, come with controllers and batteries/battery cradles. They install the ones they like. Congrats. You are now a e-bike builder and will be learning how to do this or how to get this done. Crimp tools and solder irons will become your friends.

You can look at what connectors come with the TDSZ2. If they are any good, then some battery vendors might be willing to pull a battery from inventory and install the same type. Hopefully, they give you enough wire , don't put it on backwards, and don't charge you $100. I have heard that some US suppliers are nice though. Ask.

In any case, never trust any battery connector to be right til you tested it with a voltmeter. It's surprising how often chargers and batteries are wired backwards from the factory. I never got one backwards, but I once got a 52 V charger in a 48V box. I believe I shortened the life on my battery using it.

And really, congrats on taking the plunge into a build. You will get to know your bike, and that's a good thing.

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Marin
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Re: Need Help Selecting Battery for TSDZ2 36V 350W

Post by Marin » Wed Nov 08, 2017 10:43 pm

I have some of these motors and they all have come with a matching connector for the battery side.
Image
Marin ex-rental hybrid with 48v bionx...sold
Specialized hardrock with magic pie 4-5
Lunacycle with l/r mid drive coming soon
Kona Caldera with QS 30H (maybe), and phase runner

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Marin
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Re: Need Help Selecting Battery for TSDZ2 36V 350W

Post by Marin » Wed Nov 08, 2017 10:50 pm

There are lots of ways to install a battery on a bike and almost always custom.
On this bike I didn’t use connectors it’s hardwired inside the hard pack cradle. Image
Marin ex-rental hybrid with 48v bionx...sold
Specialized hardrock with magic pie 4-5
Lunacycle with l/r mid drive coming soon
Kona Caldera with QS 30H (maybe), and phase runner

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