bajafx4
03-23-2007, 09:50 AM
I'm converting my Empire Reloader to operate on two 9V batteries. Which would be a better battery choice for the hopper?
1) Rechargeable Powerex NiMH 9V (8.4V actual) 300mAh
2) Rechargeable Powerex NiMH 9V (9.6v actual) 230mAh
3) Rechargeable iPower Lithium 9V (? actual) 500mAh
I calculate that #1 generates 2.52watt/h and #2 generates 2.21watt/h, so #1 is a more "powerful" battery. The question is, would the hopper benefit more from increased voltage or current.
I can't calculate for #3 because the actual voltage isn't provided, but even worst case if it's a 7.2v output the battery still generates 3.6watt/h. It's most likely about 8.4v so that would generate 4.2watt/h.
The lithium battery is clearly the most powerful, but the probelm I have with lithium batteries is that they don't give any warning before they go dead. They usually maintain their designed voltage output and then just all of the sudded stop making power. This would be a bad thing in a hopper; because of the way alkaline batteries slowly reduce their voltage output as they get used I can always tell when my batteries need replacing, so I can replace them before they totally die. Also, the lithium batteries are nearly 2x the cost of NiMH.
1) Rechargeable Powerex NiMH 9V (8.4V actual) 300mAh
2) Rechargeable Powerex NiMH 9V (9.6v actual) 230mAh
3) Rechargeable iPower Lithium 9V (? actual) 500mAh
I calculate that #1 generates 2.52watt/h and #2 generates 2.21watt/h, so #1 is a more "powerful" battery. The question is, would the hopper benefit more from increased voltage or current.
I can't calculate for #3 because the actual voltage isn't provided, but even worst case if it's a 7.2v output the battery still generates 3.6watt/h. It's most likely about 8.4v so that would generate 4.2watt/h.
The lithium battery is clearly the most powerful, but the probelm I have with lithium batteries is that they don't give any warning before they go dead. They usually maintain their designed voltage output and then just all of the sudded stop making power. This would be a bad thing in a hopper; because of the way alkaline batteries slowly reduce their voltage output as they get used I can always tell when my batteries need replacing, so I can replace them before they totally die. Also, the lithium batteries are nearly 2x the cost of NiMH.