The YB-28A is an enlarged battery magazine for use with the Type 28, Type 30, or Type 33 Nekovalkyrja Service Pistols.

Commodore Yuki Toshiro's NSP (faded, in Yggdrasill colors) with YB-28A Triple-Power Magazine loaded (highlighted).

• 150 shots in Stun Mode
• 30 shots in Heavy Mode
• Emergency Power Jack (For a communicator or other device), Top Mounted
• Shot counter (default red, but variable in color), Rear-mounted
• Laser Sight Mode LED (blue), Top-mounted
• Flashlight Mode LED (yellow), Top-mounted
• Stun Mode LED (orange), Top-mounted
• Heavy Mode LED (red), Top-mounted
• Magazine Release Button, Rear/bottom-mounted
• Belt Clip, Underside-mounted
• Comes with external charger for 50 extra KS, plugs into Emergency Power Jack
• Comes with a Rail mount for Scopes, for an extra 25 KS

Note that three 50 shot BR-28Cs cost 300 KS – while one can get the same shot count in a single YC-28A, a rail mount, and a charger for 50 KS less.

• 175 KS per YB-28A
• 200 KS per YB-28A with Rail Mount for Scope
• 50 KS per charger

The Nekovalkyrja Service Pistol, Type 33 and Nekovalkyrja Service Pistol, Type 30 are the recent incarnations of the NSP in the military; while the Nekovalkyrja Service Pistol, Type 28 is still a formidable weapon which is found semi-commonly as salvage, though often without a battery magazine. This battery pack, though designed around the Type 28, is compatible with both.

Commodore Yuki Toshiro of the SRSS Yggdrasill found a pair of NSPs in this way, and wished to build batteries for them, while making their shape more common for use in his generic holsters. This resulted in the YB-28A Triple-Power Magazine.

This fairly rugged battery magazine contains triple the battery life when compared to a normal NSP magazine. It can fire 150 shots on Stun Mode, and 30 on Heavy Mode, and can power the Laser Sight and Flashlight should the NSP's internal power source deplete. Since standard issue for the SAoY is three 50-shot magazines, an NSP with a single YB-28A has the same firepower as a typical SAoY soldier carrying an NSP with two spare standard-issue BR-28 series batteries.

The YB-28A not only has the dimensions of the BR-28C standard magazine, but also has an additional upper battery rod running the full length of the gun (see the main picture). The issue of that rod staying secure to the gun was resolved by a highly magnetic groove in which the NSP's original gunsights attach. Due to this, the battery locks firmly in place until removed, able to take drops and sustain extended use. In spite of its larger battery capacity, the components used in its construction make the increase in weight negligible. It is also able to replace the BR-28E used in the Nekovalkyrja Service Pistol, Type 30, permitting use with the current generation of NSPs.

The battery has gunsights to replace those on the NSP it covers, a built-in belt clip to affix extra magazines to belts or pockets, an Emergency Power Jack to power external devices, and a third-party shot counter with various indicators.

The Emergency Power Jack is also used to charge the YB-28A with a generic charger shipped for an extra 50 KS, and will also work to power any device with an identical jack. Both the charger and the YB-28A detect the power needs of the appliance, and react accordingly if it's within their power. In this case, the Shot Counter switches to a percentile counter indicating remaining power. The YB-28A need not be plugged into an NSP to power a device through the Emergency Power Jack.

Some magazines come with low profile sliding magnetic Rail Mounts for Scopes, for an extra 25 KS.

Loading the magazine in the NSP is quite simple. One just slides the groove over the NSP's gunsights and then the magazine clicks into the back as a normal NSP magazine would.

Removing the battery is as easy as holding a small button as one pulls the battery back and out of the unit.