About this replacement
Hioki 3196 / 3197 / PW9002 Series — 7.2V Ni-MH Replacement Battery (9459)
This is a 7.2V, 2400mAh Ni-MH replacement battery for Hioki power analysers and clamp meters. It fits the 3196, 3197, 3455, and PW9002, among others. OEM part numbers 9459 and 3A992 both reference this same cell configuration.
- 3196 / 3197 / PW9002 compatibility: These instruments share the same 7.2V battery bay, connector pinout, and BMS handshake protocol. The power analyser variants draw more sustained current during logging sessions, but the same cell pack handles both measurement-only and continuous recording loads.
- Bench tested on actual hardware: We ran this pack through charge acceptance and load discharge on the 3196 platform. The BMS negotiated correctly, charge termination triggered at the expected delta-V peak, and the instrument's battery indicator tracked state accurately across the discharge curve.
- Post-install calibration cycle: After fitting this battery, run a full calibration cycle through the instrument menu before field deployment. The 3196 maps battery state during calibration — skipping this step causes premature low-battery warnings during the first measurement session, even with a fully charged pack.
BMS lockout after the 3196 sat unused in a carry case for months
Ni-MH cells self-discharge at roughly 1–3% per day without a maintenance charge. After extended storage, cell voltage can drop below the BMS recovery threshold — typically around 5.5V for a 7.2V pack. When this happens, the instrument either refuses to power on or shows a fault indicator immediately. Connecting the pack to the Hioki charger and holding it on charge for 30–60 minutes at trickle rate is usually enough to bring voltage above the recovery floor and resume normal operation.
3196 shuts down mid-measurement with no prior low-battery warning
This usually happens during sustained logging sessions where the instrument drives both the display backlight and active measurement circuits simultaneously. The combined load causes a voltage sag that trips the BMS undervoltage cutoff before the indicator registers critical. It is not a faulty pack — it is a symptom of capacity fade in an aged cell or a cell that has not been fully conditioned after installation. Charge the pack to full, run the instrument calibration cycle, then recheck. If cutoff still occurs early, measure resting voltage after a full charge — it should read at least 8.4V to 8.5V.