FAQs
How do I know which battery fits my Mobile Warming gear?
Match two things: voltage and garment type. Mobile Warming batteries come in 3.7V (mostly heated socks and the Thawdaddy line), 5V and 7V (gloves), 7.4V (the workhorse for jackets, vests, and newer gloves), and 12V for dual-power garments. Within a voltage, shapes differ — sock batteries are small and curved to sit at the cuff, glove batteries are slim clamshells. Your garment's product page or manual names its compatible battery; match that name rather than guessing by looks.
What's the difference between the 3.7V, 7.4V, and 12V batteries?
Voltage tracks the size of the job. 3.7V packs are compact cells for socks and small accessories; 7.4V packs power jackets, vests, and many gloves, and come in Mini, standard, Plus, and XL Plus capacities; the 12V set serves dual-power garments and includes its own charger. Higher capacity — the mAh number — generally means longer run time at a given setting, but actual hours depend on the garment and heat level, so check the garment's product page for its rating.
Is a spare battery worth it?
For all-day cold — work shifts, hunting sits, full days on the hill — yes, and it's the most effective upgrade you can make. A charged spare in an inside pocket doubles your heated time, and the swap takes seconds. Several options here come as dual packs (sock and glove batteries especially) at around $70, which is the economical way to do it. If your day reliably outlasts one charge, a second battery is cheaper than buying a warmer garment.
How should I charge and store these batteries?
Use the matching Mobile Warming charger — they're inexpensive at $10 to $15 and specific to battery type — and charge fully before first use. Off-season storage is where most batteries die: lithium-ion cells don't like sitting fully drained for months, so top them up periodically over the summer. Store them indoors at room temperature, not in a garage or car. If a battery stops taking a charge after a long dormant stretch, that storage gap is usually the reason.
What do the Bluetooth batteries add?
The 12V Bluetooth battery pairs with the phone app so you can adjust and monitor heat without reaching for the garment button — and this one adds a USB port and built-in flashlight, so it doubles as a small power bank. The 3.7V Bluetooth sock batteries do the same for heated socks, which is genuinely useful since sock controls otherwise live at your ankle. If your garment isn't Bluetooth-enabled, a standard battery does the same heating job for less money.
