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ediciones
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→Maximizing Battery Life
Running Time
|-
| GPS Standby in open terrain with clear view to sky
| 100%
| 125 mW
| (40 h)
|-
| GPS Standby without clear view to sky i.e. inside building
| 140%
| 175 mW
| (28 h)
|-
| GPS Standby + Recording + Screen Active + Zooming/Moving
| 250%
| 313 mW
| (16 h)
|-
| GPS Standby + Recording + Screen Active + 50% Backlight
| 200%
| 250 mW
| (20 h)
|-
| GPS Standby + Recording + Screen Active + 100% Backlight
| 380%
| 475 mW
|}
{| class="wikitable"
|+Typical battery life with GPS handheld device
! Battery Type
! Typical Battery Life[1]
! Nominal Voltage
! Weight
! Comment
|-
|colspan="5"| Rechargeable Battery Types
|-
| NiMH
| 2 to 3 days
| 1.2 V
| 2 x 25 g
| Lowest Long-Term-Cost. Suitable for recharging
i.e. when carrying a solar panel or recharging in towns.
|-
|colspan="5"Not Rechargeable Battery Types
|-
| Alkaline
| 3 to 4 days
| 1.5 V
| 2 x 23 g
| Best Weight-Cost-Ratio especially when not carrying a solar panel. Not suitable for recharging.
|-
| Lithium
| 4 to 5 days
| 1.5 V
| 2 x 15 g
| Luxury Low-Weight-Option or emergency spares. Do not recharge as these batteries may explode.
|-
|colspan="5"Not Recommended Battery Types
|-
| Lithium-Ion
| -
| 3.7 V
| -
| DO NOT USE! AA sized 14500 Li-Ion batteries have a voltage of 3.7 V what may permanently damage the GPS.
|-
| Zinc-Carbon
| -
| 1.5 V
| -
| DO NOT USE! Zin-Carbon batteries have a much lower capacity, are not cold-resistant and may leak.
|}
Carry enough spares and consider the use of a solar panel to recharge. If running low on power switch the GPS completely off while the route is clearly visible.
'''Note''': The typical battery life is based on the experience of a few hikers (including me) that did not necessarily apply all the recommended power-saving settings, might not have used new healthy NiMH batteries or more sophisticated Garmin GPS devices with a higher power consumption. Therefore, the typical battery lift is rather conservative, and the actual battery life may exceed these values. I will update these numbers once I receive more feedbacks from other hikers that used eTrex20x or eTrex30x devices and applied all the recommended power-saving settings.
===Optimizing GPS Displays===
In the Setup menu under Page Sequence you can select displays that are useful for you i.e. the Map page, the Compass page, the Elevation Plot and many more. By hitting the back button you switch between your pre-select pages without selecting them every time in Main Menu.
