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battery capacity for exterra 70
- Thread starter pinpointa
- Start date
pinpointa, I use alkalines most of the time for a couple reasons. One, they are cheap over here. Two, I tend to forget to charge the NiMH before going hunting. When I do use the NiMH cells, I use 2300 ma cells. They will provide a working voltage for +/- 25 hours. Tough to say exactly how long they will last, as they continue to fade a bit when not in use. I have the 2300's because I bought them with their charger for under $15. If you are buying some, keep in mind the more milliamps, the longer they will last between charges. And, remember that the NiMH cells will drop off much quicker once the X-Terra gives you the low battery signal. When you hear that with the NiMH cells, you best be ready with some fresh cells. When you hear it with the alkalines, you can still hunt for a bit longer. One word of caution.... if using rechargeables, don't use the Lithium Ion batteries. The X-Terra is designed to operate on less than 8 volts. Four alkalines = 6 volts. Four NiMH cells = 4.8 volts. Four Lithium Ion cells at 3.6 volts each will have a combined voltage of over 14 volts. That will likely smoke the X-Terra. 
HH Randy
HH Randytony (Orlando FL)
New member
Hey Digger,
You must have some super hot cells there!
Your voltages put a scare into so I dropped everything and hurried to read the voltages on my lI cells in the digi cam. Shewwww they were only 1.6v !
They are the energizer e2 cells.
Tony
You must have some super hot cells there!
Your voltages put a scare into so I dropped everything and hurried to read the voltages on my lI cells in the digi cam. Shewwww they were only 1.6v !
They are the energizer e2 cells.
Tony
I was just passing along information I found online. Your e2 cells are rated at 1.5 volts, so apparentyl Energizer uses Lithium as an anode and something else as their cathode in their e2 Lithium cells.
http://en.wikipedia.org/wiki/Lithium_ion_battery
Lithium-ion batteries have a nominal open-circuit voltage of 3.6 V and a typical charging voltage of 4.2 V. The charging procedure is done at constant voltage with current limiting circuitry. This means charging with constant current until a voltage of 4.2 V is reached by the cell and continuing with a constant voltage applied until the current drops close to zero. (Typically the charge is terminated at 7% of the initial charge current.) In the past, lithium-ion batteries could not be fast-charged and typically needed at least two hours to fully charge. Current generation cells can be fully charged in 45 minutes or less; some reach 90% in as little as 10 minutes
http://en.wikipedia.org/wiki/Lithium_ion_battery
Lithium-ion batteries have a nominal open-circuit voltage of 3.6 V and a typical charging voltage of 4.2 V. The charging procedure is done at constant voltage with current limiting circuitry. This means charging with constant current until a voltage of 4.2 V is reached by the cell and continuing with a constant voltage applied until the current drops close to zero. (Typically the charge is terminated at 7% of the initial charge current.) In the past, lithium-ion batteries could not be fast-charged and typically needed at least two hours to fully charge. Current generation cells can be fully charged in 45 minutes or less; some reach 90% in as little as 10 minutes
Hi Digger,
Thanks for your help so can i just go as an example 3500 m.a. cells an it will give me more user time. I have had the quattro for 2 and a half years and just sold it 2 days a go so i have not had to worry about recharbles as i had the pack with the detector. But now a new learning curve with the exterra 70 which i will buy shortly thanks for those articles you sent to me a while a go.
Regards Pinpointa down under in Australia.
You got it! Voltage = amps X resistance. Roughly speaking, voltage is a 1.5 volts per alkaline cell and 1.2 volts for a NiMH cell. That makes a 4 cell alkaline battery fully charged at 6 volts. A 4 cell NiMH battery would be close to 4.8 volts (in theory). The resistance (opposition to current flow as determined by the electrical characteristics of the detector) is also a constant. So, in the formula (voltage = amps X resistance) if the voltage is constant and the resistance is constant, then the only varying component will be the current flow, measured in milliamps. So, basically, 3000 ma cells will provide twice the service time as 1500 milliamp cells. HH Randy
G,day Pinpointa.
I use Energiser 2500mah rechargeable nimh's in my 70 total cost in Oz for thr batts and charger around $40. I have been using them for over a year and they still work great. I get around 20 to 30 hours depending upon how hard the machine works. If I am working an area where I can run a high sensitivity setting from 25 to 30 and the ground is not bad and there's a lot of targets etc then I get around 20 hours. Not so hot ground, low minerals etc then around 30.
Bit like driving a car on a highway as compared to city driving. It can vary a lot at times.
I use Energiser 2500mah rechargeable nimh's in my 70 total cost in Oz for thr batts and charger around $40. I have been using them for over a year and they still work great. I get around 20 to 30 hours depending upon how hard the machine works. If I am working an area where I can run a high sensitivity setting from 25 to 30 and the ground is not bad and there's a lot of targets etc then I get around 20 hours. Not so hot ground, low minerals etc then around 30.
Bit like driving a car on a highway as compared to city driving. It can vary a lot at times.
Bavaria Mike
New member
2500 Mah NiMH and they work great! Seem to get around 23 hours operating time with them running in all metal with no headphones and it beeps a lot. I think it is crazy not to use rechargeables for several reasons, expense is number one and environmental is number two. Rechargeables are the way to go. Do the math if you want and try both, add the expenses of operation time and you will soon figure out those alkalines are only convenient and not worth it. HH, Mike