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This battery has the following equivalent part numbers HMA2104, HTPA7W, BKB191210/4, but I cannot find any information on the polarity/pinout of the 3 pins.

Is there some safe way to figure out the polarity of the battery? Maybe the IV characteristic for some small currents/voltages.

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    \$\begingroup\$ If the battery has zero charge, then the cells are dead - you won't be able to charge it anyway. Toss it! If you want to replace the cells, you need to open it up anyway. \$\endgroup\$ – DoxyLover Oct 21 '16 at 22:35
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    \$\begingroup\$ Opening the case may provide markings on the cells inside. \$\endgroup\$ – Bort Oct 21 '16 at 23:04
  • \$\begingroup\$ It could be two 3.6V NiMh cells in series with the centre tap used for charger balancing \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Oct 22 '16 at 0:20
  • \$\begingroup\$ You don't have access to a charger for the battery? I mean a factory charger? Maybe it would be easier to take it apart and put two lithium batteries in there. \$\endgroup\$ – mkeith Oct 22 '16 at 3:13
  • \$\begingroup\$ I don't have a charger for the battery. Even if the cells in the battery are dead, I would like to know the pinout so that I can power the device that goes with the battery. The case looks like it's ultrasonically welded, so it would be nice to avoid opening the battery. \$\endgroup\$ – Gus Oct 22 '16 at 3:34

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