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Re: Is there such thing as a "D" cell NIMH "battery bank"
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no regulation needed. I have a couple of those 7.2V nom. LiIon batteries, which do need a converter to get 5V. |
Re: Is there such thing as a "D" cell NIMH "battery bank"
I too would like a better charging solution.
All the "chargers' I've found recently either use 1 AA or 4 AAA, I want one that uses 2 or 4 AAA, has a meter to tell me what it's status is, and has interchangeable tips. Any links? /edit - never mind, found the Tekcharge does most of what I want. /edit2- found it at ecost |
Re: Is there such thing as a "D" cell NIMH "battery bank"
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I can mention if you decide on a Tekkeon myPower MP3400/MP3450 make sure you get the newest revision as they had to make a hardware change because there was a very slight voltage spike on initial power up. And if were using a Cradlepoint CTR350 MBB router and the power supply the spike could kill your router. So, the good folks at Tekkeon decided to make a change to their product in order to prevent it from happening. Even though they said it was only the CTR350 that had the problem. But, ya never know... I was on the fence for getting an MP3450 for the router as that is the more power hungry device. But went with the MP1550 instead because of the weight/portability side of things. I grabbed the 12 eneloop's and should be good for a solid 10+ hrs...probably closer to 12 hrs of moderate to heavy use. Did you check out what they have over at http://www.batterygeek.com ? It's a good place to find ideas of what is out there in terms of portable power. Oh, btw, I got the MP1550 on Amazon just recently for $19.99 + like $5 shipping. So with shipping it was $25. I like it because it does have a voltage regulator which for my use, the router, it really important. I am not sure how much the NIT can absorb in terms of flaky voltage. Not sure I wanna find out either. |
Re: Is there such thing as a "D" cell NIMH "battery bank"
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yea, my laptop battery is 10.8 Volts, but AC adapter in is 19 Volts, so i guess an external battery would have to be 19v?? i dont have enough knowledge to make it, just saw that NiMH D cells get you 14.4 watt-hours per batt for ~$10 each, maybe thought it was possible to rig together 16 x D cells(1.2 volts) for 19.2 volts and roughly 230 watt-hours for $160 + parts, compared to what they usually charge, about $100 for an internal ~70 watt-hour battery....im just tired of these overpriced laptop batteries when there appears to be a far cheaper solution |
Re: Is there such thing as a "D" cell NIMH "battery bank"
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e.g. 10.8V is nominal. At full charge it will be 12.6V. similarly, your 16 D-cells might be 22V at full charge, which is _probably_ OK. Quote:
You know you could run your laptop DIRECTLY off a 12V car battery. Or use a widely-available converter to charge the laptop. Much cheaper and more capacity than "overpriced laptop batteries". |
Re: Is there such thing as a "D" cell NIMH "battery bank"
I'd recommend messing with some 18650 Li-Ion cells (I highly recommend protected ones unless you like explosions), at 3.7v 2000mah, that's equivalent to a 6000mah 1.5v cell, but smaller and lighter. Two of them, and a switchmode DC-DC converter (don't use a linear regulator) should last for a fair while.
Batteries: http://www.dealextreme.com/details.d...979~r.45363994 Chargers: http://www.dealextreme.com/details.d...151~r.45363994, http://www.dealextreme.com/details.d...105~r.45363994 or http://www.dealextreme.com/details.d...499~r.45363994 Much smaller and lighter than a D cell. |
Re: Is there such thing as a "D" cell NIMH "battery bank"
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Re: Is there such thing as a "D" cell NIMH "battery bank"
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$1.50 - $2.00 per watt-hour for the standard laptop batts vs. the NiMH batts at about 75 cents per watt-hour....i guess there must be reasons though.... charging off a 12V car battery is not an option for me...best option i have is getting about 400-500 watt-hours of batts and recharge them every 3-4 days |
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