DeLorme Earthmate GPS PN-30 - Manual (Page 84)

Batteries
The Earthmate ® PN-40 and PN-30 can be powered by two AA
batteries (NiMH, alkaline, or lithium), or a DeLorme-supplied Li-Ion
rechargeable battery. You’ll find Earthmate PN-Series accessories
at www.delorme.com.
Rechargeable Lithium-Ion Battery Pack Caution
Use only an Earthmate PN-Series Battery Type. Risk of explosion
if battery is replaced by an incorrect type. Dispose of used batteries
according to the instructions.