Can anyone suggest a 3.7v high capacity battery?
Can anyone suggest a 3.7v high capacity battery?
(OP)
I'm working on a project where I need to deploy GPS devices in remote areas. Typical batteries only last a few days to a few weeks, depending on mode the device is in.
I need a battery that will remain charged for a year or longer under typical draw, if such a beast exists. Size is not important. I will be designing a custom enclosure and can accommodate most anything. I would prefer something flat, so say if it was an inch thick but 1 foot by 1 foot square, it would be better than if it looked like a car battery. I've searched the net to no avail.
Can anyone point me to a battery or company?
I need a battery that will remain charged for a year or longer under typical draw, if such a beast exists. Size is not important. I will be designing a custom enclosure and can accommodate most anything. I would prefer something flat, so say if it was an inch thick but 1 foot by 1 foot square, it would be better than if it looked like a car battery. I've searched the net to no avail.
Can anyone point me to a battery or company?





RE: Can anyone suggest a 3.7v high capacity battery?
What are your power requirements? Does this device have continuous drain, or periodically wake up from a sleep mode?
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RE: Can anyone suggest a 3.7v high capacity battery?
Dan - Owner

http://www.Hi-TecDesigns.com
RE: Can anyone suggest a 3.7v high capacity battery?
TTFN
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RE: Can anyone suggest a 3.7v high capacity battery?
Even though battery size/configuration isn't a huge issue, the cost is. If I can use disposable batteries rather than rechargeable ones and save a ton of money that would be preferred. Thanks to everyone for your help.
RE: Can anyone suggest a 3.7v high capacity battery?
We're not talking a standard car battery here, though, as that'll be stone dead long before that year is up.
Dan - Owner

http://www.Hi-TecDesigns.com
RE: Can anyone suggest a 3.7v high capacity battery?
http://www.atlaptopbattery.co.uk
RE: Can anyone suggest a 3.7v high capacity battery?
[3.5mA*(24h-1min)+13mA*1min]*365 = 30Ah
for 30 days, it's 2.5Ah. A typical D-cell is rated at 15Ah, but the discharge curves show that at the discharges you are talking about, it's probably only good for about 1500 hrs: http://www1.duracell.com/oem/Pdf/others/ATB-5.pdf
So, one simple alternative, given that alkaline batteries have very good shelf life, is to have a bank of such batteries and switch them in, after the previous one has lost too much capacity. So, something like a set of 7 D-cells, individually selectable, and switched out avery 1250 hrs would be a possible solution.
TTFN
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