I have a general question. I have a GSM module (adh8066 link to data sheet below) that I purchased from sparkfun. In the data sheet, it states that in tx mode, the module can draw up to 2 amps @ 12v.HOWEVER, the datasheet states that the module only needs 3.4V～4.5V (4.0V is recommended).
The BOB for this has a recommended voltage of 6-12v with 2 amps. I am curious about this because an iphone 4 battery is rated at 3.7 volts. Is there a major difference in these cell modules, or is a 3.7 volt battery able to provide a peak amperage for short periods of time or is the iPhones cell module a completely different technology? It's a little confusing since the data sheet stated 3.4-4.5 but the module can draw 2a from a 12v source.
The reason I am curious is because I wanted to power the adh8066 with a battery and receive 3-5 texts per day and have the battery last for 3 months (perhaps unreasonable). Is there a reasonable sized rechargeable battery that would power this GSM module?
EDIT- I have been reading a bit more. Would a 3.7 volt battery rated for 2500mah work to power the gsm at 1-2 second bursts of 2 amp?