Max current per battery chemistry
... how about this one then?




Figure 1. The maximum discharge current is given in the Electrical Specification section.

In this case the maximum discharge current is limited by the Protection Circuit Module to 600 mA.


  ... if I want something in the range of 6 V &amp; 4 A (at startup, normally half of that), then LiPO is not possible?


Here's another random datasheet: YT683496EH:



Figure 2. Snother random datasheet YT683496EH.

Main points:


This one has a capacity of 1500 mAh (line 3). It's 'C' value is 1500 mA.
Its rapid charge rate is 1C (line 5) or 1500 mA so it will take at least one hour to charge.
Its dicharge current is quite high at up to 25 C (35 A) continuous or 35 C burst (line 7).


You should be able to find the required information in the datasheets. If there are no datasheets then buyer beware.