inputs.text: marketed portable battery minor solar charging ability - needed portable battery hiking since like gps track distancesspeedetc gps kills battery galaxy wifi ridiculously fast without backup battery gps would last 4 hours dying followed instructions revive xl fully charged drained battery couple times took 205 mile hike battery worked great backup battery hike let charge hours managed accumulate 1 bar fine instructions say needed charging least 13 hours fully chargedbecause revive xl gps managed last 10 hours battery ran gps died last 05 mile hike showed clearly needed higher capacity batteryso backup battery great using normal charge kindle mp3 player fine last chargeshowever main problem like many others mentioned solar charging lacking left charger full sunlight outside 2 full days highest charge got 2 bars left week still 2 barsno matter many days leave charger sunlight never get past 2 bars charging time get past 2 bars charge usbat price paid feel like charge better sunlight even 5 cycles exercise battery still got 2 barsalso price could get 12000mah portable battery capacity im pretty sure gps still working 13 hour hike somealthough like could hang charger backpack carabiner wouldnt trust window suctions stay place driving didnt use solar panel extender since didnt want spend money extra panels get 2 bars solar chargingthis decent product good backup battery terrible solar charger marketed portable battery minor solar charging ability not solar charging battery