Measurements

Batterya	Type	Weight g	Carga Ohm	No load V	Loaded V	R(int) Ohm	Capacity mAh
Energizer [1]	Alk	25	10	1.612	1.503	0.73	2.651
Energizer	Alk	25	3.9	1.609	1.384	0.63	2.053
Duracell	Alk	23	3.9	1.616	1.422	0.53	2.007
Duracell [3]	Alk	23	3.9	1.602	1.473	0.34	2.255
Philips	Alk	22	3.9	1.537	1.281	0.780	1.675
Energizer Titanium	Alk	23	3.9	1.560	1.330	0.67	2.231
Kodak	Alk	23	3.9	1.620	1.414	0.57	2.035
Camelion	Alk	22	3.9	1.621	1.403	0.61	1.928
Sony [4]	Alk	22	3.9
Sony	Alk	22	3.9	1.517	1.308	0.62	1.939
Rayovac	Alk	22	3.9	1.590	1.371	0.62	2.047
Maxell Ace	Alk	22	3.9	-	-	-	-	Error [2]
Hi-Watt	Alk	22	3.9	1.577	1.371	0.59	1.696
Panasonic	Alk	22	3.9	1.611	1.402	0.58	2.251
Varta Photo	Alk	23	3.9	1.574	1.444	0.35	1.506
EverActive	Alk	23	3.9	1.604	1.445	0.43	2.044
Energizer Lithium	Lit	14	3.9	1.790	1.410	1.05	2.707
Energizer Lithium	Lit	15	3.9	1.768	1.249	1.6	3.01
Energizer Lithium [5]	Lit	15	3.9	1.749	1.260	1.51	2.99

[1] Mind: This test was done with a 10 Ohm load. Capacity always increases when using lighter loads! To compare with the others use the 3.9 Ohm test below.

[2] Maxell battery: Measured 0V at start. Negative connection of battery was loose, can applying pressure showed some voltage, but function could not be restored. No obvious cause of damage could be seen.

[3] Duracell at higher temperature. This plot was done at about 35C, about 10C warmer than the previous plot. Capacity increased about 12%! Battery efficiency is very dependent on temperature.

[4] SONY Walkman. During the first test, electric power broke down long enough to loose all data. On the second try, the battery showed definite signs of having been used before. Maybe, if I have the time, I'll repeat the test.

[5] Energizer Lithium. Added 2007/05/22. Measured with the battery inside the refrigerator's freezer compartment (approx -7 C).

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(c) John Coppens ON6JC/LW3HAZ

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