Yes, you can discharge the battery down to 0%. When it reaches 0%, it will enter low voltage protection (sleep mode). To recharge, simply connect a lithium-approved charger, which will wake up the battery and begin charging it again.

Yes, you can jump start a lithium battery using an AGM or lead battery, as long as the jump starting battery has a higher voltage than the lithium battery you’re trying to start.

Yes, you can jump start a lithium battery. Use either another battery that is charged at least 50% or an approved lithium jump starter pack. We recommend jump pack for reliability.

Yes. The Millertech app tracks up to six batteries at once, so there’s no switching between apps

Yes, for Sport Series batteries. With your permission, Millertech can log into your battery through the app and fix some problems remotely.

Both the Max 4.0 and the Max 8.0 have a built-in battery usage meter.

To wake up a lithium battery in protection mode, use a lithium charger, which is specifically designed to bring the battery out of low voltage protection/sleep mode. If the lithium charger doesn’t work, you can try “jumping” the battery by connecting it to a dedicated jump pack or another battery. Using equipment designed for lithium batteries is the most effective and recommended way to reactivate a battery in protection mode.

The Millertech app for iOS and Android shows:
• Remaining capacity, total capacity and amp hours
• Voltage and current
• Temperature
• Recharge cycle count
• Battery status and an error log
You can also give each battery a name, like “Trolling” or “Cranking.”

The Battery Management System (BMS) puts the battery into low-voltage protection (sleep mode) to protect the cells. To wake it, connect a lithium charger, a jump pack, or another battery that’s at least 50% charged. The Dark Speed and three-bank chargers have a built-in BMS wake-up. The app shows remaining capacity in real time, so you’ll see it coming.

Most factory RV panels guess your charge from voltage, and they’re set up for lead-acid. A lithium battery holds a steady voltage almost all the way down, so those panels often read wrong. Trust the Millertech app instead: it reads remaining capacity straight from the battery’s Battery Management System (BMS). If the app also shows the battery isn’t reaching full, your converter may be using a lead-acid charging profile

Check these four things first:
• Cold: a standard lithium battery won’t take a charge below freezing, to protect the cells. Warm it up or use a heated battery.
• Charger profile: a lead-acid setting may stop short of a full charge.
• Sleep mode: if the battery ran all the way down, the BMS puts it to sleep. Wake it with a lithium charger, a jump pack or another battery that’s at least 50% charged.
• Connections: loose or corroded terminals block charging. Use ring terminals, snug and clean.
Still stuck? Call 855-MAX-LITH. For Sport Series batteries, with your permission, our Support Team can log in through the app and help remotely.