A Surprise Telephone Call From China
2140 hours my cellular rang... It was Lin. After exchanging pleasantries he arrived at the crux of the call. A manufacturer is contemplating mass production of a hand-held meter referred to a...
Forum Discussion
Hi,
I have been using 3.7 volt LI battery for many years, rated at between 3,000 ma and 5,000 ma. The size is 18650 or 18 mm diameter and 65 mm long. 26650 is also a common size, and 4,000 ma to 7500 ma capacity. I have recently seen 14500 (I think) battery that is said to be the same size as the AA batter but rechargeable 3.7 volt LI battery.
The LI battery that I have been buying is 'rated' at 5000 ma, but in reality, I don't think it meets more than about 75% of the rating that is printed on the battery. Why they don't just call it what it is, and say it is rated at 4,000 when lab tests show it is good for 'about 4,000' or anything between 4,000 and 4,200. Instead they label them at 5,000 when lab tests might only show capacity of 5,000 on a few rare batteries. Most are in the 3,900 range in the field.
It would be nice to have a reliable 5 ah to 10 ah battery in the 3.7 to 6 volt range, for use in emergency back up exit lights! I really don't care if the battery is the diameter of a 'D' battery and 4" long. It is still much smaller than a typical 6 volt or 12 volt lead acid battery in use today.
I wonder how the guy in 1996 got his mind around the concept that they would be producing over a billion LED lights in 20 years if they built white ones. And a 1,000 Billion was mind blowing at that time. Now it is just the monthly output of a few machines in a factory.
Thanks for helping along the electronics industry! Back in the late 60's my dad built a Heathkit ocilloscope from a kit, that cost something like $750. When you could buy a 2 year old car for $750 back then. That thing weighted a ton! I think it was about 50 pounds, and had a 4" green scope on it.
Fred.
I have been using 3.7 volt LI battery for many years, rated at between 3,000 ma and 5,000 ma. The size is 18650 or 18 mm diameter and 65 mm long. 26650 is also a common size, and 4,000 ma to 7500 ma capacity. I have recently seen 14500 (I think) battery that is said to be the same size as the AA batter but rechargeable 3.7 volt LI battery.
The LI battery that I have been buying is 'rated' at 5000 ma, but in reality, I don't think it meets more than about 75% of the rating that is printed on the battery. Why they don't just call it what it is, and say it is rated at 4,000 when lab tests show it is good for 'about 4,000' or anything between 4,000 and 4,200. Instead they label them at 5,000 when lab tests might only show capacity of 5,000 on a few rare batteries. Most are in the 3,900 range in the field.
It would be nice to have a reliable 5 ah to 10 ah battery in the 3.7 to 6 volt range, for use in emergency back up exit lights! I really don't care if the battery is the diameter of a 'D' battery and 4" long. It is still much smaller than a typical 6 volt or 12 volt lead acid battery in use today.
I wonder how the guy in 1996 got his mind around the concept that they would be producing over a billion LED lights in 20 years if they built white ones. And a 1,000 Billion was mind blowing at that time. Now it is just the monthly output of a few machines in a factory.
Thanks for helping along the electronics industry! Back in the late 60's my dad built a Heathkit ocilloscope from a kit, that cost something like $750. When you could buy a 2 year old car for $750 back then. That thing weighted a ton! I think it was about 50 pounds, and had a 4" green scope on it.
Fred.
