Comments on: Recommended battery charge rates in MH-C9000

By: Jeff Servaas

Jeff Servaas — Sun, 23 May 2010 03:19:22 +0000

My recommended discharge rate is 0.25C. So for 2700mAh AA batteries, discharge at a maximum rate of 700mA. For 1000mAh AAA batteries, i recommend a maximum discharge rate of 200mA.

By: chewbot

chewbot — Sat, 22 May 2010 06:07:36 +0000

Great table. But what about discharge rates?

For example when using the refresh and analyse mode, should the discharge rate be the same as the charge rate?

By: Jeff Servaas

Jeff Servaas — Fri, 26 Mar 2010 04:04:00 +0000

Hi Mary, are you sure it is in ANALYZE mode rather than BREAK-IN?

While the capacity measurement of 3349mAh is very high, a voltage reading of 1.46V is normal. The charger will automatically terminate when the voltage stops increasing, or if the temperature of the batteries is too high.

By: Mary

Mary — Fri, 26 Mar 2010 02:47:50 +0000

I received my Maha Charger C9000 yesterday and successfully put two Duracell 2650 mAH through the Refresh Analyse mode. Today I am doing the same exercise with another two and they are in the charge cycle and reading 3349 mAH (1.46V) and 3351 mAH (1.46V). I am feeling a little nervous! Are there situations when the charger should be turned off?

By: David

David — Sat, 06 Mar 2010 11:31:35 +0000

I totally agree with charge rates. I tend to stick to 0.3C, rounded up to the nearest 100mA, so for a 1000ma, it would be 333 mA, rounded to 400mA, or 700mA for a 2000mAhr battery. I find the charge completion excellent, the batteries dont get warm, and the C9000 works well there.

I do use a 1C charge if necessary, but that tends to make the batteries pretty warm. They are not too hot, but hotter than I personally like to get them. I have had too many chargers in the past which tend to “cook” batteries, as well as massively overcharge them, so the C9000 is a welcome charger which has cycled my batteries faithfilly for the last 2.5 years pretty much in your above guidelines and the batteries are still testing at well over 90% of their original capacity!