Arizer Solo 7.4V Replacement Battery 3400mAh Li-ion

Arizer Solo / Solo 2 — 7.4V Li-ion Replacement Battery (2S1P/18650B)

This 7.4V, 3400mAh lithium-ion battery replaces the internal cell pack in the Arizer Solo and Solo 2 portable dry herb vaporizers. It matches the original 2S1P/18650B configuration and restores full heating capacity to both devices. Voltage and capacity figures are drawn directly from the product specification — not estimated.

• Solo and Solo 2 compatibility: Both devices run on the same 7.4V two-cell series pack with an identical connector and BMS handshake. The Solo 2 adds a digital display and faster heat-up, but the battery architecture is unchanged — the same cell pack drives both.
• Bench tested on actual hardware: We cycled this pack through full charge-discharge runs on the Solo 2, monitoring BMS cutoff thresholds under sustained heater draw at each temperature step. The protection circuit triggered correctly at low-voltage cutoff without nuisance trips during normal session use.
• Post-session recharge timing: Allow the vaporizer to cool completely between sessions before plugging in. The heating element brings the internal cavity to elevated temperatures, and the cell sits directly behind that assembly. Charging into a warm cell after a back-to-back session pushes cell temperature higher than the chemistry tolerates long-term — it shortens cycle life faster than almost anything else.

Why the Solo cuts out before the session ends

The Solo's heater draws sustained current at a fixed load — it does not pulse or throttle the way some devices do. As the cell ages and internal resistance climbs, voltage sags under that load and can trip the BMS low-voltage cutoff well before the state-of-charge indicator reads empty. A fresh cell holds the voltage rail steady across the full draw. If the old pack was shutting down mid-session, a new battery that maintains voltage above the 6.0V cutoff threshold will resolve it.

Battery percentage jumps or reads incorrectly after fitting a new pack

The Solo 2's charge indicator uses voltage thresholds to estimate state of charge — there is no coulomb counter recalibrating in the background. When a new cell with a different internal resistance profile is fitted, the reported percentage can appear to jump or settle at an odd reading. Run one complete charge cycle from flat to full without interruption. This lets the firmware re-anchor its voltage-to-percentage mapping to the new cell's actual discharge curve.