Cold Battery Test

By Michael Moore

TEST SETUP:

· I peaked each 4 cell pack discharged at room temp, peaked again then put in my freezer (10d F) for approx 1/2 hour then discharged again.

· I used a Sirius discharger ( http://www.siriuselectronics.com/supr_tst.htm) which discharges to 1.1v per cell and I set to a load of 250mAh.

· The packs were in the freezer the entire time. The discharger was left out of the freezer.

· Also, the alkaline measured 5.6v right out of the freezer, as soon as I applied load (discharge again) the voltage dropped immediately to 4.4+ and I got less them 60mAh before the discharger shut off.

RESULTS: The following chart shows the results. It indicates that the NiMH packs had the least loss (i.e., 24%). The important thing to note is the NiMH packs are 1600 NiMH. A 25% loss would still give you 1200 mah. This is two times a 600 NiCD pack before any loss. Wow! That is fantastic. - JA

BOTTOM LINE: I'm sticking to my 1600 mah NiMH rechargeable...