Airtech Studios BEU Battery Extension Unit for KWA TK45/Ronin
Airtech Studios
Product code: 5055795383918
  • Drop In Upgrade
  • For Large Batteries
  • Extra Storage Space

An extension unit for the back of your KWA TK45 or Ronin PDW, letting you install bigger batteries and play for longer with a bigger smile on your face! Less time spent in the safe zone for you...

Full description


The case is constructed from thick Polymer and clips directly onto the existing battery storage compartment as a simple drop in upgrade, and features walls which match the thickness of the existing battery compartment to increase its resistant to Shock and Impact Damage. The sides of the Box allow for the use of the Sliding Stock, and caters for larger sized batteries. This is the perfect purchase for any Airsoft Skirmisher who owns a KWA TK45 or Ronin PDW and wants to spend more time in the field playing, and less time in the safe zone waiting for a charger to finish.


  • Drop In Upgrade for the KWA TK45 or Ronin PDW
  • Clips on to the back of the existing Battery Compartment
  • Designed to utilise larger batteries
  • Tough Polymer Design to withstand Shock and Impact
  • Extra Storage Space for Batteries
  • Still allows the use of the Sliding Stock
  • Reduce the build up of heat

Package Includes:

  • BEU Battery Extension Unit for KWA TK45/Ronin



External Part Type
Stock Adaptor


Colour Wheel Greyscale
Item Colour
Construction Icon
All Polymer construction

Weight and Dimension

Product Height
Approx. 5.09cm
Product Length
Approx. 4.95cm
Product Width
Approx. 3.98cm
Weight KG Icon
Weight (KG)
Approx. 0.1kg

Part Specific

Weapon Platform
KWA VM 4 Ronin PDW, KWA TK45,

Size guide

Parts Fitting

Upgrades and Downgrades should only be undertaken by experienced players, or Airsoft Technicians. Please note, changing any internal parts of a weapon voids its warranty unless done in-house by our staff. 

Please ensure that when fitting parts the part purchased is the correct part, as once a part has been fitted we cannot accept return.

We do know that players love to tinker, so we're here to give you help should you require it, and if needed you can get in touch with our workshop for more help!

Unique Parts

Please note that some parts may be unique to a specific brand of weapon. For example: Parts for an ASG M4A1 may not fit an ICS M4A1.

Parts from the same brand typically have a high chance of fitting, though be warned, some replicas use unique parts, so please ensure the part will fit before you attempt to fit it.

If you require help with fitting any parts feel free to get in touch with us via our Contact Us Page.