Libelium Waspmote Technical Manual page 122

Characteristics of the equipment used to generate charging curves:
- Battery used
- Charging
Warning:
Batteries with voltage over 3.7V 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. DEVICES WITH NON-RECHARGEABLE BATTERIES MUST BE PROGRAMMED THROUGH
THE USB CABLE WITHOUT THE BATTERIES CONNECTED. PLEASE DOUBLE CHECK THIS CONDITION BEFORE
CONNECTING THE USB. DO NOT CONNECT EITHER UNDER ANY CIRCUMSTANCE THE SOLAR PANEL TO A DEVICE
WITH A NON-RECHARGEABLE BATTERY AS IT MAY EXPLODE AND CAUSE INJURIES AND DESTROY THE EQUIPMENT.
3.7V - 1150 mAh battery
Charging by USB (with Waspmote operating)
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Power supplies
v6.3