January 27, 2016 at 15:33AA / AAA batteries after 7 months of storage
Last year I tested 198 batteries (44 AA models and 35 AAA models). Then I measured the capacity of the batteries immediately after charging, as well as after a week and a month of storage.
I ran an additional test on most battery models seven months after charging. The results were interesting.
The batteries were discharged using the analyzer Oleg Artamonov . Batteries with a capacity above 1500 mAh were discharged with a current of 2500 mA, batteries of a lower capacity with a current of 1000 mA. As a grand test showed, the capacity of AA batteries at currents of 500 and 2500 mA is almost identical, so I discharged the batteries with high current to speed up the process.
I compared the capacity in watt hours immediately after charging and after seven months of storage.
Remaining charge in milliampere-hours.
Several batteries after seven months were completely discharged. These are Varta 2700 AA, Ansmann 2700 AA, Cosmos 2500 AA, Maha Powerex 1000 AAA, Cosmos 800 AAA, Navigator 1000 AAA.
Batteries Robiton 2850 AA, Space 2800 AA for seven months lost more than 80% of capacity.
GP High Energy 2700 AA, Navigator 2500 AA, Navigator 2700 AA, Camelion 2300 AA, Camelion 800 AAA, Varta 1000 AAA, GP 1000 AAA, FlexPower 900 AAA, Camelion 1100 AAA and Space 900 AAA batteries lost more than half their capacity in seven months.
Just in case, I tested the second instances of those batteries that were completely discharged. The second copies of Varta 2700 AA, Ansmann 2700 AA, Space 800 AAA also turned out to be discharged "to zero", but the second copy of Cosmos 2500 AA turned out to be quite alive - 1580 mAh and the second copy of Navigator 1000 AAA left more than half the charge - 590 mah. The second instance of the Maha Powerex 1000 AAA left a little more than a third of the charge - 360 mAh.
As expected, the Fujitsu 2550 LSD / Panasonic Eneloop Pro 2450 LSD and the Panasonic Eneloop Pro 900 LSD / Fujitsu 900 LSD (these are the same batteries produced at the same factory under different brands) took the first places in the remaining capacity.
Surprisingly, the champion for conservation of charge (89%) became cheap IKEA LADDA 2000 LSD batteries.
Even more surprising was the fact that the second place in charge conservation (85%) was taken by the non-LSD Cosmos 1900 battery, moreover, its second instance was no worse (just in case, I tested it).
In general, it turned out that some non-LSD batteries hold a charge no worse than LSD. And yet, out of 44 batteries, the charge of which after seven months of storage amounted to more than 70% of the initial one, there were only 8 non-LSD batteries, so it’s better to buy batteries with LSD technology (PreCharged, “already charged”).
All information about the tested batteries can be found in the excel file: nadezhin.ru/lj/ljfiles/accu_ammo1.xls. There are data on testing all copies of batteries, capacity in watt-hours, weight and initial voltage, barcodes, wholesale and retail prices in rubles, prices in dollars and euros, countries of origin, the results of all tests, including capacity after a week, a month and seven months of storage.
I plan to conduct another experiment on the batteries - to test how much energy they can give in the cold.
© 2016 Alexey Nadezhin
I ran an additional test on most battery models seven months after charging. The results were interesting.
The batteries were discharged using the analyzer Oleg Artamonov . Batteries with a capacity above 1500 mAh were discharged with a current of 2500 mA, batteries of a lower capacity with a current of 1000 mA. As a grand test showed, the capacity of AA batteries at currents of 500 and 2500 mA is almost identical, so I discharged the batteries with high current to speed up the process.
I compared the capacity in watt hours immediately after charging and after seven months of storage.
Remaining charge in milliampere-hours.
Several batteries after seven months were completely discharged. These are Varta 2700 AA, Ansmann 2700 AA, Cosmos 2500 AA, Maha Powerex 1000 AAA, Cosmos 800 AAA, Navigator 1000 AAA.
Batteries Robiton 2850 AA, Space 2800 AA for seven months lost more than 80% of capacity.
GP High Energy 2700 AA, Navigator 2500 AA, Navigator 2700 AA, Camelion 2300 AA, Camelion 800 AAA, Varta 1000 AAA, GP 1000 AAA, FlexPower 900 AAA, Camelion 1100 AAA and Space 900 AAA batteries lost more than half their capacity in seven months.
Just in case, I tested the second instances of those batteries that were completely discharged. The second copies of Varta 2700 AA, Ansmann 2700 AA, Space 800 AAA also turned out to be discharged "to zero", but the second copy of Cosmos 2500 AA turned out to be quite alive - 1580 mAh and the second copy of Navigator 1000 AAA left more than half the charge - 590 mah. The second instance of the Maha Powerex 1000 AAA left a little more than a third of the charge - 360 mAh.
As expected, the Fujitsu 2550 LSD / Panasonic Eneloop Pro 2450 LSD and the Panasonic Eneloop Pro 900 LSD / Fujitsu 900 LSD (these are the same batteries produced at the same factory under different brands) took the first places in the remaining capacity.
Surprisingly, the champion for conservation of charge (89%) became cheap IKEA LADDA 2000 LSD batteries.
Even more surprising was the fact that the second place in charge conservation (85%) was taken by the non-LSD Cosmos 1900 battery, moreover, its second instance was no worse (just in case, I tested it).
In general, it turned out that some non-LSD batteries hold a charge no worse than LSD. And yet, out of 44 batteries, the charge of which after seven months of storage amounted to more than 70% of the initial one, there were only 8 non-LSD batteries, so it’s better to buy batteries with LSD technology (PreCharged, “already charged”).
All information about the tested batteries can be found in the excel file: nadezhin.ru/lj/ljfiles/accu_ammo1.xls. There are data on testing all copies of batteries, capacity in watt-hours, weight and initial voltage, barcodes, wholesale and retail prices in rubles, prices in dollars and euros, countries of origin, the results of all tests, including capacity after a week, a month and seven months of storage.
I plan to conduct another experiment on the batteries - to test how much energy they can give in the cold.
© 2016 Alexey Nadezhin