Polymerase 14.4V PCR Instrument Compatible Battery 6400mAh

Polymerase Chain Reaction (PCR) Instrument — 14.4V Li-ion Replacement Battery

This 14.4V Li-ion battery at 6400mAh (92.16Wh) is a direct replacement for the Polymerase Chain Reaction (PCR) Instrument battery pack. It fits portable PCR units that rely on battery power to complete thermal cycling runs in the field or during lab downtime. Swap it in when the original pack can no longer hold charge through a full cycling session.

• Portable PCR platform compatibility: Portable PCR instruments draw sustained, variable current during rapid thermal cycling — temperatures swing hard between denaturation and annealing phases. This pack operates at 14.4V nominal to match the voltage rail these units require, and the cell configuration supports the repeated load spikes that occur at each cycle transition.
• Bench tested on actual hardware: We cycled this pack through repeated charge and load sequences, monitoring BMS response during high-draw thermal ramp events. The protection circuit held stable across both peak draw and sustained mid-cycle current without tripping into lockout.
• Post-install calibration on PCR instruments: After fitting this pack, run a complete thermal cycling protocol through the instrument before relying on the battery indicator. PCR instruments map battery state during active cycling, and skipping this step causes the low-battery warning to trigger early on the first real run.

BMS cutoff during the denaturation phase ramp

The denaturation phase pushes the heating block to around 95°C rapidly, which draws a sharp current spike from the battery in a short window. If the BMS sees this spike as exceeding its discharge threshold — particularly on a new or cold pack — it will cut output momentarily, aborting the cycle. This is not a faulty battery; it is the protection circuit responding to a transient the instrument firmware does not smooth out. Allow the pack to reach room temperature before running a cycle, and let the instrument complete one full dummy run to let the BMS learn the load profile.

Pack will not charge after sitting unused for several months

Li-ion cells left uncharged for extended periods can drop below the BMS recovery threshold — typically around 2.5V per cell — causing the protection circuit to enter sleep mode and block charge input entirely. The charger will show no activity, and the instrument will not power on. To recover, connect the pack to the instrument charger and leave it for up to 30 minutes without interruption; some BMS circuits require a trickle stimulus period before accepting a full charge cycle. If the pack does not respond after 30 minutes at 2.5V per cell minimum, the cells have self-discharged past safe recovery.