Choosing a battery

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Considerations when choosing an ebike battery.


Battery types

The most commonly used batteries used on endless-sphere are:

Other less commonly used batteries include:

Your Requirements

A few questions to consider when choosing a battery:

That will tell you what kind of power requirements you will have. Then you can begin to pick out your drive system, if you don't have one already.

That will then help you figure out what kind of battery and what size you need, and then you can start looking for something that will fit within those limitations, and still work on your vehicle. If what you need is too large, then you might have to compromise on some of the specifications.

If you pick a battery based solely on weight and size, it may be completely insufficient to do the work you need it to.




For more on C-rates, see Rechargeable battery basics.

Battery weight

Many different battery locations are used: rear rack, within the frame, handlebar rack, seat post bag, pannier bags, top tube bag or in a backpack. Each location has advantages and disadvantages.

Adding weight to a bike can make the bike handle poorly. Especially if the weight is at the rear and up high.[1][2] With lighter batteries (eg LiPo), the effect of battery placement is not as noticeable,[3] so it is less important to mount the battery in the ideal location for handling (which is low and between the wheels).


I can't decide on a chemistry/technology!

Basically it depends on:

Balancing: Should you not buy packs that are already paralleled? Is it possible to simply extend the pack after some use?

Balancing is important for *all* chemistries, though when they are "new" many types may not need balancing--as they age they will, though, as some cells lose capacity before others, or get higher Ri, etc. Some require an external balancing setup, and some like NiMH and NiCd do it via the main charger leads in an internal chemical process (making a lot of heat).

You can always parallel more sub-packs or whole main packs together for more capacity, evne if it is just by their main leads, letting each main pack's BMS take care of balancing or LVC/HVC/etc. Doesn't matter what kind it is, other than NiCd or NiMH (those you don't really wanna do taht with).

*See - LiPo vs SLA

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