About this replacement
Franklin Wireless T10 / RT410 — 3.8V Li-Polymer Replacement Battery (V635061P)
This 3.8V, 3700mAh lithium-polymer battery fits the Franklin Wireless T10 and RT410 mobile hotspot. It replaces OEM part V635061P directly. Use it to restore full operation when the original cell has degraded or stopped holding a charge.
- T10 and RT410 compatibility: Both models share the same battery bay dimensions, connector pinout, and BMS communication protocol — 65.50 × 53.60 × 6.90mm cell with a matched voltage rail at 3.8V nominal. One cell fits both.
- Bench tested on actual hardware: We cycled this battery through the T10's full charge and discharge sequence. The BMS accepted the cell without fault codes, completed a full charge cycle, and held stable voltage under simultaneous WiFi and LTE radio load.
- Ventilation during extended sessions: Keep the hotspot in an open, ventilated spot when running extended sessions. When connected devices are far from the hotspot, the cellular radio ramps to maximum transmit power — that sustained output generates heat that accelerates cell wear faster than normal portable use.
Hotspot disconnecting users mid-session on a new battery
When the T10 is at maximum connected clients, the combined draw from the WiFi radio and LTE modem can spike the current demand sharply. If the cell's internal resistance is elevated — even in a new but improperly stored battery — voltage sags momentarily below the BMS cutoff threshold. The hotspot firmware interprets this as a brownout and drops the WiFi broadcast to protect the modem. Check that the replacement cell reads at least 3.6V before first install; a cell below that threshold may trip the BMS under load before it has had a full charge cycle.
T10 not powering on after sitting unused for several weeks
Li-polymer cells self-discharge slowly during storage — the T10's standby drain accelerates this further if the device was left partially powered. Once the cell drops below roughly 3.0V, the BMS locks out normal boot to prevent damage to the cell. Connect the hotspot to a wall charger, not a USB port, and leave it for at least 20 minutes before attempting to power on. If the charge LED does not activate within five minutes, disconnect and reconnect the charger once to reset the BMS re-initialisation sequence.