Quantum recommends the Turbo series battery packs with CKE or CCKE cable. However the Nikon SB900 flash may cause a Turbo 2x2, Turbo SC, Turbo C or Turbo AC battery to shut down or slow down. (The original Turbo Battery is not affected) If you notice this condition, Quantum has a software upgrade for the above mentioned Turbo models. This upgrade is free for affected Turbo units under warranty. Out-of-warranty Turbo 2x2, SC, C, or AC batteries can be upgraded for $51.

Note: This upgrade is needed for the Nikon SB900 & SB910 only. If you possess units with the following serial numbers, or higher, your Turbo is already upgraded: Unit serial numbers already upgraded: Turbo 2x2 S/N R243 or above Turbo SC S/N R274 or above Turbo C S/N R112 or above Turbo AC S/N Q092 or above Send your Turbo 2x2, C, AC or SC to the address below, with a note indicating SB900 upgrade. For non-warranty upgrades provide your VISA, MC, or AMEX credit card info (for security, no emails please!), or else enclose a check for $51. (Checks could take up to 15 days to clear). NY State residents must include the appropriate sales tax. Return shipping within the U.S.A. is included.

For warranty upgrade, please provide a copy of your bill of sale. The in-house turn-around time is estimated at 1-2 weeks. Please use the address below: SB900 Upgrade Service Department Quantum Instruments 10 Commerce Drive Hauppauge NY 11788-3968 USA