Libelium Waspmote Technical Manual page 125

Battery discharging
Figure: Typical discharging curve for battery
Characteristics of the equipment used to generate charging curves:
Battery used: 3.7 V - 6600 mA·h battery
As seen above, the rechargeable battery shows a nice slope on its output voltage as its level goes down. Waspmote
monitors this voltage in order to calculate the current battery level. However, a rechargeable battery has a very
plain discharge graph, so it is not possible to know the remaining energy inside it.
Notes about the rechargeable battery:
When recharging, if the battery is near 0%, it will take some time before the battery level increases.
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It is normal to see some battery level variations during the charging periods due to the Waspmote charging
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circuitry. To know the real battery level of the node, it is recommended to measure it when the node is not
being recharged and also with sensors and radio modules switched off.
Warning: Batteries with voltage over 3.7 V could irreparably damage Waspmote.
Incorrect battery connection could irreparably damage Waspmote.
DO NOT TRY TO RECHARGE THE NON-RECHARGEABLE BATTERY, IT MAY EXPLODE AND CAUSE INJURIES
AND DESTROY THE EQUIPMENT. USE NON-RECHARGEABLE BATTERIES ONLY WITH DEVICES PROPERLY
PREPARED. PLEASE DOUBLE CHECK THIS CONDITION BEFORE CONNECTING THE USB OR THE SOLAR
PANEL.
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Power supplies
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