BP-K75L | Kenwood TH-D74 TH-D75 | 5,000mAh | USB-C | Made in USA

BP-K75L: High-Capacity USB-C Battery for Kenwood TH-D74 & TH-D75

More Power. Modern Charging. Built to Last.

The BP-K75L is a 5,000mAh (36Wh) extended-life battery pack that replaces the stock 1,820mAh Kenwood battery and delivers 2.7× the capacity. Charge it with any USB-C cable, swap the cells when they wear out, and finally use your D74 or D75 all day without carrying spares.

Not compatible with the TH-D72 or the stock desk cradle.

Designed, printed, and hand-assembled in Colorado, USA.

Specifications:

• Capacity: 5,000mAh / 36Wh (2.7× stock)
• Cells: Genuine Samsung 50E 21700 (user-replaceable)
• Charging: USB-C, 15W with PPS (Programmable Power Supply) support
• Charge Time: Under 3 hours typical, under 4 hours max
• Runtime: All-day operation with GPS and APRS enabled
• Protection: Built-in BMS. Overcharge, over-discharge, and short-circuit protection
• Housing: 3D-printed ASA (heat-resistant, UV-stable, textured grip)
• Weight: 6.5 oz
• Thickness: 25mm
• Color: Black
• Warranty: 1 year

Compatibility:

Kenwood TH-D74A and TH-D75. Not compatible with the TH-D72.

What's Included:

• (1) BP-K75L battery pack, fully assembled
• (1) Belt clip spacer with screws
• (1) Spare battery latch

Design Details:

The shell includes a metal hinge, an included belt clip spacer, and a fix for the low-power default behavior found in earlier revisions. The locking mechanism is different from the stock battery. Do not bend the latch outward, as this will damage it. If you need help with installation, watch the installation video.

Each battery is 3D-printed and hand-assembled. Minor texture variations are cosmetic and do not affect performance.

Charging Notes:

Not all USB-C cables are created equal. If charging doesn't start, try a different cable. USB-A to USB-C cables are the most universally reliable. PPS-capable chargers will negotiate the optimal charge rate automatically.

Recommended Charger:

Any USB-C charger rated 15W or higher will charge the battery at full speed. Lower-wattage chargers will still work, they'll just charge slower. PPS (Programmable Power Supply) chargers will automatically negotiate the optimal charge rate but are not required. A USB-A to USB-C cable with a standard USB-A wall adapter also works and is the most universally reliable option.

Charging Indicator:

• Red + Blue (may appear purple): Charging
• Red only: Fully charged
• Blue only: Slow charge
• Red flashing: Cable or charger issue. Swap the cable.

User-Serviceable Cells:

The BP-K75L is designed for long-term ownership. When cell capacity eventually degrades, you can open the pack and replace the Samsung 50E 21700 cells yourself. No need to buy a whole new battery.

Printable Replacement Parts:

Want to print your own replacement parts? ASA or ABS filament strongly recommended.

• Spacer for Belt Clip (3MF)
• Battery Latch (3MF)

Lead Time & Shipping:

Batteries are made to order in small batches. Current lead time is posted at the top of the site. Please check there for the most up-to-date estimate. Shipping options and costs are calculated at checkout.

• USA: USPS, UPS, and FedEx
• International: UPS and DHL. Customer is responsible for any import duties, taxes, or brokerage fees.