In my project I need a battery with a cylinder of 10mm diameter and 35mm high. I thought only Lithium Polymer technology can create battery for this size. Now I discovery Lithium-ion can have the same size!

Both are very equal in voltage and capacity. But, the capacity is critical and if I can win 10 mAh for the same size, I will choice this technology.

So, is it easy to say what technology is better? Or it depend from manufacture? Or even: The differences are so small that it doesn't matter what I choice?

  • \$\begingroup\$ Lithium-Ion Polymer (Li-Po) tends to be more energy dense than Li-ion, but they're usually flat. If it's cylindrical, a Li-ion cell is probably a better pick - less dense, but you're using more of the space. Chemistry will have far less impact than which exact cell you use, though - batteries have come a long way even in the last five years. \$\endgroup\$ – SomeoneSomewhereSupportsMonica Jun 1 '16 at 11:23

Both types of construction have similar characteristics in terms of degradation, charging behavior, and susceptibility to deep discharge problems, but:

  • Li-Polymer have a slightly higher energy density because of the way in which the separator (salt bridge) is made. This comes at a 10-30% increase in cost, however.

  • It's possible to make flexible batteries with Li-Polymer, and to make them thinner than Li-Ion.

Source: http://www.allaboutsymbian.com...

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  • \$\begingroup\$ Note that another site states that the energy density of Li-Poly is worse than Li-Ion. I believe this information is out of date. \$\endgroup\$ – JYelton Oct 14 '13 at 3:38
  • \$\begingroup\$ Just to give a feedback, price and weight is not a problem. I already see LiPol battery thinner as paper. \$\endgroup\$ – Rodrigo Oct 14 '13 at 4:15
  • \$\begingroup\$ Can you give a number for this: slightly higher energy density? About 5%, maybe 10%? \$\endgroup\$ – Rodrigo Oct 14 '13 at 4:23
  • \$\begingroup\$ Sorry, I'm not able to find any reliable information. Based on searches for recent information, I'd almost say it is negligible because some references indicate Li-Poly energy density is less while others indicate it is higher. I would guess 5% or less. \$\endgroup\$ – JYelton Oct 14 '13 at 4:33

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