The Metabo HPT BSL3650MVT 36V/18V MultiVolt T-PWR Tabless Battery (part 383581M) is a dual-voltage lithium-ion battery for Metabo HPT cordless tools. This is a MultiVolt power tool battery designed for running both Metabo HPT 18V tools and 36V MultiVolt tools from one pack. It delivers 10.0Ah when powering 18V tools and 5.0Ah when powering 36V tools.

T-PWR tabless cell technology is the headline. Metabo HPT says it lowers internal resistance so the battery delivers power more efficiently and runs cooler, which helps under sustained heavy loads such as framing with a cordless nailer, cutting with a 36V saw, or grinding. Metabo HPT rates it at 25% higher capacity and longer runtime than the previous BSL3640MVT (381991M).

The battery switches voltage automatically based on the tool it is in, so one battery type covers the whole Metabo HPT 18V and 36V MultiVolt lineup. It is the battery Metabo HPT ships with its 18V Cordless Pneumatic nailer kits, where it is rated for up to 1,170 nails per charge on the strip framing nailers.

Charging is fast on the right charger: approximately 50 minutes on the UC36YSL2, 75 minutes on the UC18YSL3Q1Y or UC18YTSLQ2Y, 150 minutes on the UC18YFSL, 185 minutes on the UC18DAQ4, and 300 minutes on the UC18YKSLQ1Y. A 4-stage fuel gauge on the pack shows remaining charge, and a rubber base helps keep it from sliding and protects finished surfaces.

Pick this one up if you run Metabo HPT 36V MultiVolt tools, own a Cordless Pneumatic nailer and want a second pack, or want the highest-capacity 18V battery Metabo HPT offers for heavy-draw tools.

The Big-Tank MultiVolt Pack

The Metabo HPT BSL3650MVT gives you the most runtime Metabo HPT offers in a battery that works on both 18V and 36V tools.

• Who it's for: Metabo HPT MultiVolt users and anyone running a Cordless Pneumatic nailer who needs a second pack.
• Why it stands out: Tabless cells for cooler running and 25% more capacity than the BSL3640MVT it replaces.
• Worth knowing: At 2.2 lb it adds noticeable weight on small 18V tools, where a 5.0Ah pack makes more sense.

• Which tools does it power? Metabo HPT states it powers all Metabo HPT 18V tools and 36V MultiVolt tools.
• How long does it take to charge? Approximately 50 minutes on the UC36YSL2, 75 minutes on the UC18YSL3Q1Y or UC18YTSLQ2Y, 150 minutes on the UC18YFSL, 185 minutes on the UC18DAQ4, and 300 minutes on the UC18YKSLQ1Y.
• Is this the battery that comes with the Cordless Pneumatic nailer kits? Yes. The BSL3650MVT (383581M) is the battery included with the Metabo HPT 18V Cordless Pneumatic nailer kits.