This is probably a higher current than the batteries are intended for, although not high enough to overheat and damage them, so it is a good test of their abilities.Īs with my series of AA tests, the 9V batteries were tested in four stages: Both charging and discharging were done at a current of 140 mA, which is the lowest available current setting. I tested the Tenergy 9V batteries using my BattMan II computer controlled battery manager. However, the higher voltage means that in many applications, the usable capacity will be higher (that is, the capacity before the voltage drops too low to operate the device). Of course, that means that each cell must be slightly smaller, thus giving the slightly lower than average capacity. I was glad to find that Tenergy’s 9V battery produces 8.4V, meaning that it is made up from seven cells instead of only six. Some devices designed to operate from 9V batteries will not work with such a low voltage. Many “9V” rechargeable batteries are similarly made of from six 1.2V NiMH cells, giving a total of only 7.2V. Thus, the voltage of the entire battery must be a multiple of 1.2V.Ī disposable alkaline 9V battery is made up of six 1.5V alkaline cells, giving a total of 9V. This is because NiMH and NiCd batteries must be made up from individual NiMH or NiCd cells, each of which produces 1.2 Volts. Like any NiMH (or NiCd) 9V battery, the Tenergy Centura doesn’t actually produce 9 Volts. Its rated capacity is 200mAh, which is about half the capacity of a disposable 9V alkaline battery, and slightly below average among rechargeable 9V NiMH batteries.
The Tenergy Centura 9V battery is, of course, the same size and shape as any other 9V battery. So far I’ve tested the AA and AAA sizes (included in my low self-discharge battery comparison), and the 9V size described here. So, I was quite happy when I received an e-mail one day from Tenergy, asking if I’d like to review their new Centura line of line of low self-discharge AA, AAA, C, D, and 9V batteries. However, they are still used, and I have two devices that would benefit from a rechargeable 9V battery: an active-noise-reduction (ANR) aviation headset, and the remote control for my gas fireplace. Those of you over the age of about 35 may remember these referred to as “transistor radio batteries”, but improvements in technology have rendered them obsolete for that purpose. This lack of interest on the part of manufacturers in producing a 9V battery is probably due to the relatively few applications for this battery. It seems like everyone is producing the AA size, and some manufacturers are also making the smaller AAA, but no one has taken the trouble to make a 9V battery.
Ever since I tested the first AA low self-discharge NiMH rechargeable battery, I’ve been waiting for someone to produce one in the 9V (PP3) size.
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