External Battery Pack for the Blackberry Curve 8300, 8310, 8320, 8330, 8350i, 8350 -- Jump Start Emergency Instant Cell Phone Charger that powers Mini USB phones. Ready to call within minutes, just plug directly to power up your phone. Jump Start Emergency Instant Cell Phone Charger for the Blackberry Curve 8300, 8310, 8320, 8330. 8350i and 8350. Rechargeable emergency battery charger for jump starting and recharging cell phones with a LED charging indicator. Ready to call within minutes, just plug directly to power up your phone and hangs conveniently on your phone. Over charge protection, short circuit protection, over discharge, IC chip prevents overcharging. 1-Hour Talk Time. Lithium battery stays charged up to 1 year.